SURFACE FLUX DATA FROM THE SGP97 HYDROLOGY EXPERIMENT

Introduction

Description of dataset

Original and Modified dataset

Parameters measured

Original Investigator Dataset

Modified Investigator Dataset

Flags

The Files

Formats

Naming convention

Data Access and Contacts

FTP Site

Points of Contact

Specifics

List of investigators

Locations and Parameters

Locations and Instruments

Filenames and Dates of Data

Appendix

Special Notes on Data Processing to Modified Investigator Level

Investigator's Documentation

Surface Flux Data

U. Wisc SSEC

Surface Flux Teams

Introduction

As part of ground support efforts for the Southern Great Plains (SGP) Experiment, surface flux stations were deployed around the SGP study region to measure the energy 3udget at the earth's surface. The USDA, Georgia Tech, University of Arizona, and NASA deployed six eddy covariance (EC) stations and four energy balance Bowen ratio (EBBR) stations at all three of the main SGP study areas. These sites were located at the Department of Energy's Atmosphere and Radiation Measurement Cloud and Radiation Testbad (ARM-CART) Central Facility, the USDA's Grazinglands Research Laboratory in El Reno, and within the Little Washita watershed region. Surface flux data were supplemented with data from permanent EC and EBBR stations located in the SGP area and maintained by GEWEX and the DOE ARM program. The University of Wisconsin-Madison deployed a "roving" EC system that was used to calibrate net radiometers and compare flux measurements between the various systems.

Description of Dataset

Original and modified

It was decided that there would be two versions of each investigator's dataset submitted to the DAAC. One dataset is the original investigator's dataset and the second dataset is a modified version of the same data. The following table shows the parameters that were measured by investigators. Not all investigators measured all parameters shown below. Specific parameters measured by each investigator and locations of stations are found in part VI.

Parameters Measured

SGP Surface Flux Parameters: Identification of site and PI Site_ID   Julian day of year DOY   Central Standard Time CST   Net radiation Rnet W m-2 Latent heat flux LE W m-2 Sensible heat flux H W m-2 Soil heat flux G W m-2 Carbon dioxiCarbon dioxide flux CO2 _mol m-2 s-1 Friction velocity u* m s-1 Wind speed (horizontal) Uave m s-1 Wind direction Udir degrees North Air temperature Tair degrees Celsius Vapor pressure eair kPa Vertical velocity standard deviation stdw m s-1 Horizontal velocity standard deviation stdU m s-1 Air temperature standard deviation stdT degrees Celsius Vapor pressure standard deviation stde kPa Flags for fluxes FLAG fluxes Flags for other data FLAG other No data -999

Fluxes are denoted as positive when they are moving away from the surface, except for net radiation which is positive towards the surface. All parameters are thirty minute averages with time given as the midpoint of the thirty-minute interval.

Original Investigator Dataset

The original investigator's dataset is the data "as submitted" to the University of Wisconsin-Madison who then quality-checked and modified the data. Net radiation is as measured by the net radiometer and then corrected for wind effects. For each investigator's dataset, soil heat flux is an average of output from all soil heat flux plates used by the particular investigator and has been corrected for soil heat storage. Latent and sensible heat flux are as measured by the EC systems and as estimated from the EBBR systems using the measured Bowen ratio as follows:

LE=(Rn-G)/(1+B) H=Rn-G-LE

Air temperature is either estimated from the measured sonic air temperature or measured from a separate thermometer for the EC systems, and is measured from the lower arm on the EBBR systems.

Modified Investigator Dataset

The first step in creating the modifed dataset was to average all soil heat flux values for a particular site. All systems used similar models of REBS soil heat flux plates. This value is reported for G in each investigator's dataset such that two investigators that were colocated would have identical values of the site-averaged soil heat flux. The University of Wisconsin-Madison set up a Kipp and Zonen net radiometer next to many of the other net radiometers (REBS models) used in the experiment. A linear calibration was performed on all data according to the relation found between the Kipp and Zonen and each net radiometer. If the Kipp and Zonen was never colocated with a particular net radiometer, that net radiometer was calibrated with a colocated net radiometer that was colocated with the Kipp and Zonen at some point. This new Rnet value and the site-averaged G value were used to adjust EBBR data so that equations (1) and (2) would hold true by maintaining the Bowen ratio measured by the EBBR systems. Since Bowen ratios are near 0 during the night, all values of LE and H have been set to 0 for EBBR systems between sunset and sunrise. Since EC systems measure all four components of the energy budget independently, equations (1) and (2) would not hold true for EC data. It was decided that the energy budget should be forced to close by assuming the EC systems accurately measured the Bowen ratio. This Bowen ratio was found by dividing the measured sensible heat flux by the measured latent heat flux:

B=H/LE

This measured Bowen ratio was then used in equations (1) and (2) along with the site-average G and calibrated Rnet to estimate EC LE and H. This was done for all datasets except ER01PH and CF02PH. This system measured LE values that were questionable. Since the Bowen ratio was not assumed to be measured accurately from these systems, the energy balance has been closed by solving for LE as a residual to the energy budget according to LE=Rnet-G-H.

Near sunrise and sunset, the Bowen ratio approaches -1 when sensible and latent heat flux are similar in magnitude but opposite in sign. In such cases, equation (1) will be unrealistically large and LE and H will not represent true estimates of fluxes. These unrealistic values have been substituted with values estimated from measured Bowen ratios from nearby time periods. This substitution will be noted in the FLAG column.

Flags

There are two columns that follow the measured parameters in each modified dataset that contain flags. The first column contains flags for the five fluxes, while the second column contains flags for the remaining parameters. The flag definitions are shown in the following table:

Flags used in SGP modified dataset 0 Data is unmodified 1 Any time other than sunrise/sunset when measured B was near -1 so B from surrounding time period was used to estimate LE and H 2 Near sunrise/sunset and measured B was near -1 so B from surrounding time period was used to estimate LE and H 3 EBBR LE and H values set to 0 during night 4 Rnet wind corrected by using Uave from nearby system since measured Uave missing 5 Uave normally measured from weather system that is substituted with EC Uave 6 Missing data that has been linearly interpolated

The Files

File Format

Group		File type	Format	Headers	#Files	Avg File size	Storage required
Data files		ascii	19-column tables	2 header rows1	59	~74KB	4.4MB
Documents	*.txt	ascii	Text	NA	1	45KB
	*.doc	Microsoft Word	Text	NA	1	120KB
1. See surface flux parameters table above for header row 1 (parameters) and row 2 (units).

File Naming Convention

File names are of the form

ER05PSod.txt
where

ER05 = site

PS = team acquiring data

od/md = original/modified data

Data Access and Contacts

FTP Site

The SGP97 Surface Flux Data is in the following GES DISC ftp site:

SGP97 surface_fluxes ftp site

Points of Contact

For questions about the Surface Flux data contact

Tracy E. Twine

Center for Sustainability and the Global Environment

1225 West Dayton Street

Madison, WI 53706

(608) 262-4775

E-mail: tetwine@students.wisc.edu

For more information using GES DISC data, contact:

Hydrology Data Support Team

Goddard Earth Sciences
Data and Information Services Center (GES DISC)

Code 610.2

NASA Goddard Space Flight Center

Greenbelt, Maryland 20771

E-mail: hydrology-disc@listserv.gsfc.nasa.gov

Voice: 301-614-5165

Fax: 301-614-5268

Specifics

List of Investigators

ARM	DOE Atmosphere and Radiation Measurement Program Located at all three study areas and use both EC and EBBR systems
BCCL	Bill Crosson and Charles Laymon NASA Global Hydrology and Climate Center Located at El Reno for intercomparison, then Little Washita EBBR system
CPL	Christa Peters-Lidard, Georgia Tech Located at El Reno for intercomparison, then ARM-CART EBBR system
JPBK	John Prueger and Bill Kustas USDA Agricultural Research Service (ARS) Located at El Reno Four EC systems
JS	John Schieldge, NASA Jet Propulsion Laboratory (JPL) Located at El Reno Three EC systems
PH	Paul Houser (from NASA Goddard Space Flight Center) University of Arizona EC system
PS	Patrick Starks USDA Agricultural Research Service (ARS) Located at El Reno Two EBBR systems
TM	Tilden Meyers, NOAA Air Resources Laboratory Atmospheric Turbulence and Diffusion Division Located in Little Washita watershed region GEWEX EC system
JN	John Norman, University of Wisconsin-Madison Located at all three SGP study areas Roving EC system

Locations and Parameters

ARM-CART CENTRAL FACILITY

CF01ARM	Rnet, LE, H, G, Uave, Udir, Tair, eair
CF02ARM	LE, H, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
CF02CPL	Rn, G, Tair, eair
CF02PH	Rn, LE, H, G, CO2, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT

EL RENO

ER01ARM	Rn, LE, H, G, Uave, Udir, Tair, eair
ER01BCCL	Rnet, LE, H, G, eair
ER01CPL	Rn, G, Tair, eair
ER01JPBK	Rn, LE, H, G, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
ER01JS	LE, H, u*, Uave, Tair, eair, stdw, stdU, stdT, stde
ER01PH	Rn, LE, H, G, CO2, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
ER01PS	Rn, LE, H, G, CO2, Uave, Udir, Tair, eair
ER05JPBK	Rn, LE, H, G, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
ER05PS	Rn, LE, H, G, CO2, Uave, Udir, Tair, eair
ER06JS	Rn, LE, H, G, stdw, stdT
ER09JPBK	Rn, LE, H, G, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
ER13JPBK	Rn, LE, H, G, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
ER14JS	LE, H, u*, Uave, Tair, eair, stdU, stdT

LITTLE WASHITA

LW02TM	Rnet, LE, H, G, CO2, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
LW03ARM	Rn, LE, H, G, Uave, Udir, Tair, eair
LW07BCCL	Rnet, LE, H, G, Tair, eair
LW08ARM	LE, H, u*, Uave, Udir, Tair, eair, stdw, stdU, stdT, stde
JN	Rn, LE, H, u*, Uave, Udir, Tair, stdw, stdU, stdT--at several sites for comparison

Locations and Instruments

ARM-CART CENTRAL FACILITY Parameter: Rnet Site Instrument make and model Height(m) CF01ARM REBS** Q*6.1 or Q*7.1 2.3 CF01JN Kipp and Zonen CNR1 1.98 CF02ARM N/A N/A CF02CPL REBS Q*7.1-L 1.83 CF02PH REBS Q97301 0.5 CF02JN N/A N/A NOTE: **REBS= Radiation and Energy Balance Systems

Parameter: LE Site Instrument make and model Height(m) CF01ARM Chromel-constantan thermocouple, Omega Engineering Inc., REBS Model # ATP-1, Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D 0.96, 1.96 CF01JN N/A N/A CF02ARM Infrared Hygrometer, Analytic Applications Inc. Model M100 3.0 CF02CPL Campbell Scientific Bowen Ratio 023A enclosure with hygrometer and controller, Type E fine-wire thermocouples (TCBR-3) 1.68, 2.81 CF02PH Li-Cor LI-6262 CO2/H2O analyzer 3.5 CF02JN Campbell Scientific 3-D sonic anemometer (CSAT3) with krypton hygrometer (KH20) 3.25

Parameter: H Site Instrument make and model Height(m) CF01ARM Chromel-constantan thermocouple, Omega Engineering Inc., REBS Model # ATP-1, Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D 0.96, 1.96 CF01JN N/A N/A CF02ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 CF02CPL Campbell Scientific Bowen Ratio 023A enclosure with hygrometer and controller, Type E fine-wire thermocouples (TCBR-3) 1.68, 2.81 CF02PH 3-D Solent sonic anemometer 1012R2A 2.5 CF02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25

Parameter: G Site Instrument make and model Height(m) CF01ARM Platinum Resistance Temperature Detector, MINCO Products, Inc., REBS Model #STP-1, MINCO Model # XS11PA40T260X36(D) with Soil Heat Flow Probes, Radiation & Energy Balance Systems, Inc.,Model#s HFT-3, HFT3.1 -0.05 CF01JN N/A N/A CF02ARM N/A N/A CF02CPL REBS HFT3-L soil heat flux transducers, Campbell Scientific 2X2 (TCAV-L) averaging thermocouple -0.075, -0.025, -0.05 CF02PH REBS HFT3-L soil heat flux transducers, Campbell Scientific 2X2 (TCAV-L35) averaging thermocouple -0.07, -0.05, -0.02 CF02JN N/A N/A

Parameter: CO2 Site Instrument make and model Height(m) CF01ARM N/A N/A CF01JN N/A N/A CF02ARM N/A N/A CF02CPL N/A N/A CF02PH Li-Cor LI-6262 CO2/H2O analyzer 2.5 CF02JN N/A N/A

Parameter: u* Site Instrument make and model Height(m) CF01ARM N/A N/A CF01JN N/A N/A CF02ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 CF02CPL N/A N/A CF02PH 3-D Solent sonic anemometer 1012R2A 2.5 CF02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25

Parameter: Uave Site Instrument make and model Height(m) CF01ARM Wind Speed Sensor, Met One Instruments, model #s 010B and 010C 2.5 CF01JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 CF02ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 CF02CPL RM Young Wind Sentry 03001 2.22 CF02PH RM Young Wind sentry 03001-U 2.5 CF02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25

Parameter: Udir Site Instrument make and model Height(m) CF01ARM Wind Speed Sensor, Met One Instruments, model #s 010B and 010C 2.5 CF01JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 CF02ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 CF02CPL RM Young Wind Sentry 03001 2.22 CF02PH RM Young Wind sentry 03001-U 2.5 CF02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25

Parameter: Tair Site Instrument make and model Height(m) CF01ARM Platinum Resistance Temperature Detector (PRTD) 0.96, 1.96 CF01JN N/A N/A CF02ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 CF02CPL Vaisala Relative humidity/air temperature sensor (HMP35C) 2.0 CF02PH Vaisala Relative humidity/air temperature sensor (HMP35C) 2.0 CF02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25

Parameter: eair Site Instrument make and model Height(m) CF01ARM Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D 0.96, 1.96 CF01JN N/A N/A CF02ARM Infrared Hygrometer, Analytic Applications Inc. Model M100 3.0 CF02CPL Vaisala Relative humidity/air temperature sensor (HMP35C) 2.0 CF02PH Vaisala Relative humidity/air temperature sensor (HMP35C) 2.0 CF02JN N/A N/A

EL RENO Parameter: Rnet Site Instrument make and model Height(m) ER01ARM REBS Q*6.1 or Q*7.1 2.5 ER01CPL REBS Q*7.1-L 0.91 ER01JNARM Kipp and Zonen CNR1 2.5 ER01JNPH Kipp and Zonen CNR1 1.0 ER01JNPS Kipp and Zonen CNR1 1.5 ER13JN N/A N/A ER01JPBK REBS Q*6 10.0 ER05JPBK REBS Q*6 2.0 ER09JPBK REBS Q*6 2.0 ER13JPBK REBS Q*7.1 2.0 ER01JS N/A N/A ER06JS REBS Q*7.1 2.0 ER14JS N/A N/A ER01PH REBS Q97301 1.0 ERallPS REBS Q*7 1.5
Parameter: LE Site Instrument make and model Height(m) ER01ARM Chromel-constantan thermocouple, Omega Engineering Inc., REBS Model # ATP-1, Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D 1.6, 2.6 ER01CPL Campbell Scientific Bowen Ratio 023A enclosure with hygrometer and controller,Type E fine-wire thermocouples (TCBR-3) 1.38, 2.81 ER01JN N/A N/A ER13JN Campbell Scientific 3-D sonic anemometer (CSAT3) with krypton hygrometer (KH20) 3.3 ERallJPBK Campbell Scientific 3-D sonic anemometer (CSAT3) with krypton hygrometer (KH20) 2.0 ER01PH Li-Cor LI-6262 CO2/H2O analyzer 1.5 ERallPS Li-Cor LI-6262 CO2/H2O analyzer, Type E fine-wire thermocouples (TCBR-3) 1.5, 2.5 ER01JS Campbell Scientific 3-D sonic anemometer (CSAT3) with CA127 TC and krypton hygrometer (KH20) 1.9 ER06JS N/A N/A ER14JS Campbell Scientific 3-D sonic anemometer (CSAT3) with CA127 TC and krypton hygrometer (KH20) 2.5
Parameter: H Site Instrument make and model Height(m) ER01ARM Chromel-constantan thermocouple, Omega Engineering Inc., REBS Model # ATP-1, Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D 1.6, 2.6 ER01CPL Campbell Scientific Bowen Ratio 023A enclosure with hygrometer and controller,Type E fine-wire thermocouples (TCBR-3) 1.38, 2.81 ER01JN N/A N/A ER13JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.3 ERallJPBK Campbell Scientific 3-D sonic anemometer (CSAT3) 2.0 ER01PH 3-D Solent sonic anemometer 1012R2A 1.5 ERallPS Li-Cor LI-6262 CO2/H2O analyzer, Type E fine-wire thermocouples (TCBR-3) 1.5, 2.5 ER01JS Campbell Scientific 3-D sonic anemometer (CSAT3) with CA127 TC 1.9 ER06JS Campbell Scientific 1-D sonic anemometer with CA127 TC 2.45 ER14JS Campbell Scientific 3-D sonic anemometer (CSAT3) with CA127 TC 2.5
Parameter: G Site Instrument make and model Height(m) ER01ARM Platinum Resistance Temperature Detector, MINCO Products, Inc., REBS Model #STP-1, MINCO Model # XS11PA40T260X36(D) with Soil Heat Flow Probes, Radiation & Energy Balance Systems, Inc., Model #s HFT-3, HFT3.1 -0.05 ER01CPL REBS HFT3-L soil heat flux transducers and Campbell Scientific 2X2 (TCAV-L) averaging thermocouple -0.075 -0.025, -0.05 ER01JN N/A N/A ER13JN N/A N/A ERallJPBK REBS HFT-3 soil heat flux transducers and Campbell Scientific 2X2 (TCAV) averaging thermocouples -0.08, -0.10 -0.02 and -0.06, -0.02 and -0.08 ER01PH REBS HFT3-L soil heat flux transducers and Campbell Scientific 2X2 (TCAV-L35) averaging thermocouple -0.07 -0.05, -0.02 ERallPS REBS HFT-3 soil heat flux transducers Campbell Scientific 2X2 (TCAV) averaging thermocouple -0.08 -0.02, -0.06 ER01JS N/A N/A ER06JS REBS HFT3-L soil heat flux transducers Campbell Scientific 2X2 (TCAV-L) averaging thermocouple -0.04 -0.005, -0.02 ER14JS N/A N/A
Parameter: CO2 Site Instrument make and model Height(m) ER01ARM N/A N/A ER01CPL N/A N/A ER01JN N/A N/A ER13JN N/A N/A ERallJPBK N/A N/A ER01PH Li-Cor LI-6262 CO2/H2O analyzer 1.5 ERallPS Li-Cor LI-6262 CO2/H2O analyzer 1.5, 2.5 ER01JS N/A N/A EER06JS N/A N/A ER14JS N/A N/A
Parameter: u* Site Instrument make and model Height(m) ER01ARM N/A N/A ER01CPL N/A N/A EER01JN N/A N/A ER13JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.3 ERallJPBK Campbell Scientific 3-D sonic anemometer (CSAT3) 2.0 ER01PH 3-D Solent sonic anemometer 1012R2A 1.5 ERallPS N/A N/A ER01JS Campbell Scientific 3-D sonic anemometer (CSAT3) 1.9 ER06JS N/A N/A ER14JS N/A N/A
Parameter: Uave Site Instrument make and model Height(m) ER01ARM Wind Speed Sensor, Met One Instruments, model #s 010B and 010C 3.4 ER01CPL N/A N/A ER01JN N/A N/A ER13JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.3 ERallJPBK R.M. Young 3-cup photochop anemometer 2.3 ER01PH RM Young Wind sentry/03001-U 2.5 ERallPS R.M Young 03001Wind vane/anemometer assembly (Wind Sentry Set) 3.5 ER01JS Campbell Scientific 3-D sonic anemometer (CSAT3) 1.9 ER06JS N/A N/A ER14JS N/A N/A
Parameter: Udir Site Instrument make and model Height(m) ER01ARM Wind Direction Sensor, Met One Instruments, Model #s 5470, 020C 3.4 ER01CPL N/A N/A ER01JN N/A N/A ER13JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.3 ERallJPBK R.M. Young wind vane 2.3 ER01PH RM Young Wind sentry/03001-U 2.5 ERallPS R.M Young 03001Wind vane/anemometer assembly (Wind Sentry Set) 3.5 ER01JS Campbell Scientific 3-D sonic anemometer (CSAT3) 1.9 ER06JS N/A N/A ER14JS N/A N/A
Parameter: Tair Site Instrument make and model Height(m) ER01ARM Platinum Resistance Temperature Detector (PRTD) 1.6, 2.6 ER01CPL N/A N/A ER01JN N/A N/A ER13JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.3 ERallJPBK Vaisala temperature and humidity probe 2.0 ER01PH Vaisala Relative humidity/air temperature sensor (HMP35C) 2.0 ERallPS Vaisala Relative humidity/air temperature sensor (HMP35C) 1.8 ER01JS Vaisala Relative humidity/air temperature sensor (HMP35C) 1.9, 2.67 ER06JS N/A N/A ER14JS N/A N/A
Parameter: eair Site Instrument make and model Height(m) ER01ARM Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D 1.6, 2.6 ER01CPL N/A N/A ER01JN N/A N/A ER13JN N/A N/A ERallJPBK calculated from Vaisala temperature and humidity probe 2.0 ER01PH Vaisala Relative humidity/air temperature sensor (HMP35C) 2.0 ERallPS Vaisala Relative humidity/air temperature sensor (HMP35C) 1.8 ER01JS Vaisala Relative humidity/air temperature sensor (HMP35C) 1.9 ER06JS N/A N/A ER14JS N/A N/A

LITTLE WASHITA Parameter: Rnet Site Instrument make and model Height(m) LW03ARM REBS Model Q*6.1or Q*7.1 2.0 LW08ARM N/A N/A LW07BCCL REBS Total Hemispherical Radiometer THRDS7 and Double-sided Pyranometer PDS7 2.0 LW02JN Kipp & Zonen CNR1 1.25 LW03JN Kipp & Zonen CNR1 2.25 LW08JN Kipp & Zonen CNR1 2.5 LW02TM REBS Model Q*7 1.25

Parameter: LE Site Instrument make and model Height(m) LW03ARM Chromel-constantan thermocouple, Omega Engineering Inc., REBS Model# ATP-1, Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D -999, -999 LW08ARM Infrared Hygrometer, Analytic Applications Inc. Model M100 3.0 LW07BCCL Campbell Scientific Bowen Ratio System DEW-10 0.5, 1.5 LW02JN Campbell Scientific 3-D sonic anemometer (CSAT3) with krypton hygrometer (KH20) 3.25 LW03JN Campbell Scientific 3-D sonic anemometer (CSAT3) with krypton hygrometer (KH20) 2.6 LW08JN Campbell Scientific 3-D sonic anemometer (CSAT3) with krypton hygrometer (KH20) 3.0 W02TM IRGA (H2O and CO2) NOAA/ATDD design and Sonic Anemometer Solent R2 anemometer (Gill, Instruments) 3.0

Parameter: H Site Instrument make and model Height(m) LW03ARM Chromel-constantan thermocouple, Omega Engineering Inc., REBS Model # ATP-1, Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D -999, -999 LW08ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 LW07BCCL Campbell Scientific Bowen Ratio System DEW-10 0.5, 1.5 LW02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 LW03JN Campbell Scientific 3-D sonic anemometer (CSAT3) 2.6 LW08JN Campbell Scientific 3-D sonic anemometer (CSAT3 3.0 LW02TM Sonic Anemometer Solent R2 anemometer (Gill, Instruments) 3.0

Parameter: G Site Instrument make and model Height(m) LW03ARM Platinum Resistance Temperature Detector, MINCO Products, Inc., REBS Model #STP-1, MINCO Model # XS11PA40T260X36(D) with Soil Heat Flow Probes, Radiation & Energy Balance Systems, Inc., Model #s HFT-3, HFT3.1 -0.05 LW08ARM N/A N/A LW07BCCL REBS Soil heat flux plate HTF3 and Campbell Scientific Averaging Soil Thermocouple TCAV -0.05 0 to -0.05 LW02JN N/A N/A LW03JN N/A N/A LW08JN N/A N/A LW02TM REBS HFT3-L soil heat flux transducers -0.03

Parameter: CO2 Site Instrument make and model Height(m) LW03ARM N/A N/A LW08ARM N/A N/A LW07BCCL N/A N/A LW02JN N/A N/A LW03JN N/A N/A LW08JN N/A N/A LW02TM IRGA (H2O and CO2) NOAA/ATDD design Sonic Anemometer Solent R2 anemometer (Gill, Instruments) 3.0

Parameter: u* Site Instrument make and model Height(m) LW03ARM N/A N/A LW08ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 LW07BCCL N/A N/A LW02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 LW03JN Campbell Scientific 3-D sonic anemometer (CSAT3) 2.6 LW08JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.0 LW02TM Sonic Anemometer Solent R2 anemometer (Gill, Instruments) 3.0

Parameter: Uave Site Instrument make and model Height(m) LW03ARM Wind Speed Sensor, Met One Instruments, model #s 010B and 010C -999 LW08ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 LW07BCCL N/A N/A LW02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 LW03JN Campbell Scientific 3-D sonic anemometer (CSAT3) 2.6 LW08JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.0 LW02TM Sonic Anemometer Solent R2 anemometer (Gill, Instruments) 3.0

Parameter: Udir Site Instrument make and model Height(m) LW03ARM Wind Direction Sensor, Met One Instruments, Model #s 5470, 020C -999 LW08ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 LW07BCCL N/A N/A LW02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 LLLW03JN Campbell Scientific 3-D sonic anemometer (CSAT3) 2.6 LW08JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.0 LW02TM Sonic Anemometer Solent R2 anemometer (Gill, Instruments) 3.0

Parameter: Tair Site Instrument make and model Height(m) LW03ARM Platinum Resistance Temperature Detector (PRTD) -999, -999 LW08ARM 3-D Sonic Anemometer, Applied Technologies Inc. Model SWS-211/3Sx 3.0 LW07BCCL Campbell Scientific Bowen Ratio System DEW-10 1.5 LLW02JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.25 LW03JN Campbell Scientific 3-D sonic anemometer (CSAT3) 2.6 LW08JN Campbell Scientific 3-D sonic anemometer (CSAT3) 3.0 LW02TM Vaisala CS500 2.5

Parameter: Eair Site Instrument make and model Height(m) LW03ARM Capacitive element, Vaisala Inc., Model #s HMP 35A and HMP35D -999 LW08ARM Infrared Hygrometer, Analytic Applications Inc. Model M100 3.0 LW07BCCL Campbell Scientific Bowen Ratio System DEW-10 1.5 LW02JN N/A N/A LW03JN N/A N/A LW08JN N/A N/A LW02TM Vaisala CS500 2.5

File Names and Dates of Data

Names and Descriptions of Files

Appendix

Special Notes on Data Processing to Modified Investigator Level

ALL PH data has been closed by assuming H is measured accurately and LE is calculated as a residual to the energy budget according to:

LE=Rnet-H-G

JN did not measure G so in order to close the energy budget, G has been used from the colocated system. To close JN at ER01, ER13 used JPBK At CF02 used Rnet and G from PH for both UW and ARM--used in CPL also when available, raw CPL when PH not there

CF02ARM	Rn and G have been used from CF02PH from 182:19.25 - 198:13.25 Energy budget is then closed by computing LE as a residual NOTE: data NOT between 182:19.25 and 198:13.25 has LE measured by ARM--energy budget is not closed! DOY 174 has questionable flux data--storm?
ER01PH	Used ARM Rnet until 171
ER13JN	Rn was used from ER13JPBK

Investigator's Documentation

ARM

CF02ARM "This system is deployed along an east-west fence that separates pasture from wheat. The crop height, density, and condition varies seasonally. A description of the crop condition can be found in the SURFCOND weekly reports. The fence heads north a short distance to the west. Data for winds from 90 to 270 degrees are usually representative for flows over wheat."; sensor_location = "Sensor heights 3 m above base" ; lat = 36.606 lon = -97.488 alt = 317

CF01ARM installation_date = "9/14/92"; "9/14/92"; station_exposure = "On a knoll with open exposure on all sides for several hundred meters." vegetation = "Primarily grass (~0.3 m high), interspersed with ~0.5 m high bushes and an occasional ~1 m high bush (11/12/92). 90% grass (0.4 m high), 10% weeds (0.6 m high) (06/04/93)." ; sensor_locations = Net Radiometer - 2.3 m AGL (Above Ground Level), Wind Speed and Direction - 3.4 m AGL, Barometric Pressure - 1.4 m AGL, Upper Air Temperature and Humidity - 1.8 m AGL, (06/10/92), readjusted to 1.96 m AGL (06/28/93), Lower Air Temperature and Humidity - 0.8 m AGL, (06/10/92), readjusted to 0.96 m AGL (06/28/93), Soil Heat Flux Plate - 0.05 m BGL (Below Ground Level), Soil Moisture - 0.00 to 0.05 m BGL, Soil Temperature - 0.00 to 0.05 m BGL" ; lat = 36.605 lon = -97.485 alt = 318

ER01ARM installation_date = "05/29/97" ; station_exposure = "Located near the middle of a large, ungrazed pasture field. Open exposure to same fetch in all directions for more than two hundred meters." ; vegetation = "Ungrazed prairie grass. Height 1.0 m average on 6/19/97." ; sensor_locations = Net Radiometer - 2.5 m AGL (Above Ground Level), Wind Speed and Direction - 3.4 m AGL, Barometric Pressure - 1.4 m AGL, Upper Air Temperature and Humidity - 2.6 m AGL, Lower Air Temperature and Humidity - 1.6 m AGL, Soil Heat Flux Plate - 0.05 m BGL (Below Ground Level), Soil Moisture - 0.00 to 0.05 m BGL, Soil Temperature - 0.00 to 0.05 m BGL; lat = 35.549 lon = -98.02 alt = 421

CPL - Christa Peters-Lidard

1.1 Principal Investigator Contact Information Dr. Christa Peters-Lidard Environmental Hydraulics and Water Resources School of Civil and Environmental Engineering Georgia Instititue of Technology Atlanta, GA 30332-0355 USA Phone: (404) 894-5190 Fax: (404) 894-2677 email:cpeters@ce.gatech.edu

1.2 Instrument Information Instruments are listed below with their model number and height on site. The CFMET was not set up at the El Reno location. 1.2.1 CFEBBR - Campbell Scientific Bowen Ratio Instrumentation Instrument Campbell Scientific Model Number El Reno Height Central Facility Height REBS Net Radiometer Q7.1-L 91 cm 183 cm (after harvest = 91 cm) 2 REBS Soil Heat Flux Plate HFT3-L -7.5 cm -7.5 cm Averaging Soil Thermocouple Probe TCAV-L -2.5 cm,-5 cm -2.5 cm,-5 cm Upper Type E Fine Wire Thermocouple TCBR-3 281 cm (est) 281 cm (est) Lower Type E Fine Wire Thermocouple TCBR-3 138 cm (est) 168 cm (est) Upper Bowen Ratio Arm BRA/UPR 293 cm 293 cm Lower Bowen Ratio Arm BRA/LWR 152 cm 182 cm Micrologger 21XL N/A N/A BR Enclosure w/Hygrometer & Controller 023A N/A N/A 20 Watt Solar Panel MSX20R N/A N/A 10 Air Intake Filters 5576 N/A N/A Tripod & Grounding Kit CM10 N/A N/A Deep Cycle Battery   N/A N/A NOTE: (est) = estimated 1.2.2 CFMET - Campbell Scientific Micrometerological Station Instrument Campbell Scientific Model Number Central Facility Height RM Young Wind Sentry Set 03001 222 cm Licor Pyranometer LI200X 211 cm Vaisala PTB101B Barometer CS105 193 cm Water Content Reflectometer CS615-L -5 cm Vaisala Temp & RH Probe HMP35C N/A TE Rain Gage TE525-L N/A Micrologger 21XL N/A Licor Pyranometer Base & Leveling Fixture LI2003S N/A Solar Radiation Shield for HMP35C 41002 N/A Pyranometer Crossarm Stand 025 N/A TE Rain Gage TE525-L N/A 10" x 12" Weatherproof Enclosure ENC 10/12 N/A Water Content Reflectometer CS615-L N/A 2 Meter Tripod CM6 N/A 2 10 Watt Solar Panels MSX10 N/A Deep Cycle Battery N/A   1.3 Site Information 1.3.1 ER01CPL (EL Reno) Soil type and vegetation height were not measured by this Principle Investigator. Soil type assumed to be silt loam. GPS Coordinates were not recorded. 1.3.2 CF02CPL (Central Facility) Soil type and vegetation height were not measured by this Principle Investigator. Site was harvested on the afternoon of Day 179. Soil type determined from SGP97 web site to be silt loam. GPS Coordinates are in decimal minutes: 36deg36.255min N, 97deg29.214min. W 2.1 Parameters Variable Value Units Description CP 1.01 kJ/(kg deg C) Specific Heat of Air CW 4190 J/(kg deg C) Specific Heat of Water T 1800 s Output Interval D 0.075 m Depth to Flux Plates BD 1100 kg/m^3 Soil Bulk Density Phi 0.486 m^3/m^3 Silt Loam Porosity (taken from Clapp and Hornberger) W (FC) 0.369 m^3/m^3 Silt Loam Field Capacity (calculated using Clapp and Hornberger) 2.2 Equations Variable and Equation Units Description CS = 1210000/BD J/(kg deg C) Specific Heat of Dry Soil EW = 2501 - 2.361(Ts) kJ/kg Latent Heat of Evap. S = [DelTs/T]*D*[(BD*CS)+ (W*1000*CW)] W/m^2 Heat Stored G = F + S W/m^2 Surface Soil Heat Flux DelVP = VPLo-VpUp kPa Change in Vapor Pressure BR = [(P*CP*DeltaTC)/ (0.622*EW*DelVP)] W/m^2 Bowen Ratio LE = (RN-G)/(1+BR) W/m^2 Latent Heat Flux H = RN-G-LE W/m^2 Sensible Heat Flux 2.3 Measured Values Variable Units Description Ts deg C Soil Temp. DelTs deg C Change in Soil Temp. DeltaTC deg C Change in Arm Temp. P kPa Atmospheric Pressure W percent Soil Water Content (vol.) F W/m^2 Soil Heat Flux RN W/m^2 Net Radiation 3.1 Corrections Made Converted NASA-GSFC gravimetric soil water contents into volumetric water contents. When available, CFMET Tair and eair values were used, otherwise CFEBBR values were substituted. Assigned WC a value of 0.243 for El Reno site since WC was not measured there by this PI. This WC derived from one half of the porosity for a silt loam soil (0.486). Assigned WC a value of 0.369 (silt loam field capacity) for Days 174 and 177 since gravimetric soil water contents were unavailable for these days due to rain events. Assigned WC a value of 0.087 (linear interpolation between Days 195 and 197) for Day 196 since gravimetric soil water contents were unavailable. Assigned WC a value of 0.073 (same value as Day 197) for Day 198 since gravimetric soil water contents were unavailable. When the change in CFEBBR vapor pressure was 0, LE was assigned a value of 0. When the Bowen Ratio equaled 0, H was assigned a value of 0. 3.2 Known Errors/Omissions When LE or H were over 10% larger than the available energy (RN-G), both LE and H were assigned -999. Water content measurements recorded by CS615 seem to be higher than measured gravimetric soil water content values and were not used. No water content measurements for El Reno site. Six CFEBBR Lower TC readings were not recorded for Day 163, Time 17.25, and Day 164, Times 9.25 to 11.25, so Tair was assigned -999. Delta TC were not recorded for Day 163, Time 17.25, to Day 164, Time 11.25, so LE and H were assigned -999 since the Bowen Ratio could not be calculated. No water content measurements for Days 174 and 177. Lower VP not recorded for Day 184, Time 8.25, so eair was assigned -999. First CFMET pressure readings for Day 184, Times 9.75 and 10.25, were 2.9126 and 7.2588 so the Pressure Equation was used to derive the pressure. No CFMET readings for Day 186, Times 15.75 and 16.25, therefore Tair and eair values came from CFEBBR Lower Arm and the Pressure Equation was used to derive the pressure. Gravimetric soil water contents unavailable for Days 196 and 198. 4.1 Acknowledgements Gravimetric soil water content data provided by Peggy O'Neill of NASA-GSFC. GPS coordinates of CFEBBR system provided by Chip Laymon of NASA-MSFC. Fine wire thermocouples were borrowed from Chip Laymon and Bill Crosson of NASA-MSFC. 4.2 References Clapp, R.B., and G.M. Hornberger, 1978, "Empirical equations for some soil hydraulic properties", Water Resources Research, 14:601-604.

JPBK - John Prueger and Bill Kustas

Four flux stations were operated by John Prueger and Bill Kustas at the El Reno site. They were located in soil moisture sampling sites labeled ER01, ER05, ER09 and ER13. Both ER01 and ER05 sites were rangeland areas, densely vegetated grasslands containing a significant amount of thatch and standing senescent vegetation. Vegetation height was variable ranging from approximately 0.5 to 1 m. ER01 was not grazed during the experiment and was more dense and appeared to have more "green" or active vegetation compared to the ER05 site; the ER01 site was grazed. Around 30% of the ER01 surface contained a native shrub called buckbrush; little if any of this shrub existed in ER05. The ER09 site was in a heavily grazed pasture. Vegetation height in ER09 was approximately 0.25 m. ER13 was in a winter wheat field harvested and disced to a depth of approximately 0.2 m. The surface was primarily bare soil with some wheat stubble. Net Radiation was estimated using primarily two models of Radiation and Energy Balance Systems (REBS) radiometers (Q*6 and Q*7.1). The Q*6 radiometers were used at ER01, ER05 and ER09 with a model Q*7.1 used at ER13. The net radiometers were positioned at a nominal height of 2 m above the surface at ER05, ER09 and ER13. ER01 had several radiometers positioned at different heights during the experiment. A Q*6 was positioned at 10 m throughout the study period while a Q*6 and a Q*7 were located about 2 m above the surface at different periods during the field campaign. Air temperature and relative humidity were measured with a Vaisala temperature and humidity probe at a nominal height of 2 m at all four sites. Saturation and actual vapor pressures were calculated from the temperature and humidity data. At all four sites wind speed was measured with a R.M. Young 3-cup photochop anemometer having a 0.3 m/s threshold. In addition, wind direction was measured at ER01, ER05, and ER09 using a R.M. Young wind vane. Wind direction is also reported at ER13 using the average of wind direction observations at ER01 and ER09. the Measurement height for wind speed and direction was approximately 2.3 m above the surface. At all four sites the turbulent fluxes of sensible and latent heat were measured with a Campbell Scientific 3-D sonic anemometer (CSAT3) and krypton hygrometer (KH20). These instruments were positioned at a nominal height of 2 m above the surface. For all four sites, soil heat flux was estimated using a combination method of two soil heat flow plates and the soil storage above each plate estimated using two soil temperature probes. The heat flow plates were at either -0.08 or -0.10 m with the corresponding soil temperature probes at -0.02 and -0.06 m for the plates at -0.08 m or -0.02 and -0.08 m for the plates at -0.10 m.

JS - John Schieldge, NASA Jet Propulsion Laboratory (JPL)

Profile System at ER01 Type Model Manufacturer Height/Depth 5-Anemometer 034 Met One 2.69,3.28,4.21,4.72,5.54m 4-Temperature ASPTC CSI 2.92,3.80,4.50,5.11m 2-Temp/RH HMP35C Vaisala 1.90,2.67m

Sonics at ER01 Type Model Manufacturer Height/Depth 3D Sonic CSAT3 CSI 1.9m 2-Hygrometer KH20 CSI 1.9m 1-D Sonic CA27 CSI 1.9m 2-FWTC CA127 CSI 1.9m

1-D SEB system at ER06 Type Model Manufacturer Height/Depth 1-D Sonic CA27 CSI 2.45m 1-FWTC CA127 CSI 2.45m Soil Heat HFT3 REBS 0.04m 2-Soil TC 107B CSI 0.005,0.02m Net Rad Q7.1 REBS 2.0m

3-D Sonic at Kingfisher Type Model Manufacturer Height/Depth 3-D Sonic CSAT3 CSI 2.5m 1-FWTC CA127 CSI 2.5m Hygrometer KH20 CSI 2.5m Grass/bush heights: Near calibration sites at Mare's barn ER01 Grass = 24 to 28 in. (0.61-0.71m) Bush = 30 to 36 in. (0.76-0.91m) Grass/flower(daisies?)fields surrounding site = 24 to 32 in (0.61-0.81m) Around 1d system on field ER06 Grass = 14 to 16 in (0.36-0.41m) Bush = same as above GPS UTM coord at ER06 station 587681E and 3933986N

PH - Shuttleworth/Houser/Harlow/Lee SGP97 Hydromet instruments

Instrument Manufact./Type/Model Heights ER CF Wind Speed/Direction RM Young Wind sentry/03001-U 2.5m 2.5m Net Radiation REBS Q97301 1m .5m Incoming SW Licor pyran./py17144 1.5m .5m Outgoing SW Licor pyran./py17144 1.5m .5m Temp/Humidity Visala HMP35C 2m 2m Soil Heat Flux REBS HFT3 -7cm -7cm Soil Temperature Campbell avg. TC/TCAV-L35 -2,-5cm -2,-5cm Soil Moisture Watermark 257 -5cm -5cm 3D Sonic Anemometer Solent 1012R2A 1.5m 2.5m Gas Analyzer Licor 6262 1.5m 2.5m Precipitation Texas elect TE525 .2m .2m

Location: El Reno Field 01, Near Arm EBBR system: UTM: 0589171N 3935262E Alt: 395 Vegetation Type: Tall Grass Pasture Instrument Heights: Fluxes: 1.5 m, AWS: 2m Instrument Type: UA 3D Solent Sonic-Licor 6262 Eddy Correlation System, Campbell Weather Station Contact: Paul R. Houser NASA-Goddard, Code 974 Greenbelt, MD 20771 301-286-7702 houser@horton.gsfc.nasa.gov Jim Shuttleworth Univ. of Arizona Bldg 22, Room 122 Tucson, Arizona 85721 520-621-8787 shuttle@hwr.arizona.edu Notes: Wind direction is calibrated to ARM Ground temperature for computation of G is from ARM_EBBR LE, and stdE not reliable due to bad H2O span calibration Rnet after 171 is wind corrected -999 indicates no data Rnet is from ARM_EBBR until DOY171 System: UA-AWS: Univ of Arizona Automatic Weather Station UA-EC: Univ of Arizona Eddy Correlation System

PS - Patrick Starks, Notes concerning the USDA-ARS Energy Balance Bowen Ratio Setup at ER05PS and ER01PS

Equipment: The Bowen Ratio systems are manufactured by Campbell Scientific, Inc., and each consists of the following components: 1Li-Cor LI-6262 CO2/H2O analyzer 1 REBS Q7.0 net radiometer 1 R.M Young 03001Wind vane/anemometer assembly (Wind Sentry Set) 2 REBS HFT-3 soil heat flux transducers 1 Campbell Scientific 2X2 (TCAV) averaging thermocouple 1 Vaisala Relative humidity/air temperature sensor (HMP35C 1 each Type E fine-wire thermocouples (TCBR-3) for the upper and lower arm assemblies. 1 CR21-X data logger The Q7.0 and HFT-3 part numbers were purchased from directly Radiation Energy Balance Systems, Seattle, Washington. The LI-6262 was purchased from LI-Cor, Inc., Lincoln, Nebraska. All other components were purchased from Campbell Scientific, Logan, Utah. The HFT-3 heat flux plates were placed at 8 cm beneath the soil surface. The four leads from the 2X2 averaging thermocouple were placed at 2 and 6 cm depths( two at each depth) in the soil. The Vaisala RH/T sensors was placed on the Bowen Ratio tripod at approximately 6 ft. above the soil surface. The lower arm of the Bowen Ratio system was place about 1m above the vegetative canopy with the second arm about 1 m above the lower arm. The arms were not moved during the experimental period. The net radiometer was placed several meters to the south and west of the Bowen Ratio tripod and about 1.5 meters above the soil surface. The net radiometers were not moved during the course of the experiment. The wind vane/anemometer assembly was placed near or on the top of the Bowen Ratio tripod (approximately 3.5 m above the soil surface). Site locations: ER01 located at: 35 33 25.4 N latitude and 98 00 58.3 W longitude. ER05 located at: 35 32 55.4 N latitude and 98 02 13.2 W longitude. (Locations determined on 1-20-98 using a handheld differential GPS unit.)

Cryptic field log notes (Early in the experiment the two Bowen Ratio stations were run side-by-side at the Mare Barn site, ER01, in order to monitor their performance since this was our first time running these systems. The Bowen Ratio system referred to as the winter wheat site system was later moved to the Mesonet site (i.e., ER05), the other system was referred to as the Rangeland system, sometimes the flux site system or F2, and remained in ER01 for the duration of the SGP experiment.) 6-12-97 1740CST Input proper calibration coefficients into the 6262 and CR21X for site F2BR. 6-20-97 1250CST Replaced/changed soil heat flux plate constants to correct values on winter wheat Bowen Ratio station. 6-20-97 1255CST Noted that LI-Cor 6262 on rangeland Bowen Ratio switch was in "zero" position. 6-23-97 Winter wheat Bowen Ratio visited and adjusted between 1630 to 1927 CDST (1530-1827 CST). Good data should begin about 1840 CST. 6-27-97 Winter wheat Bowen Ratio system moved to Mesonet tower site (ER05). Good data should begin about 1320 CST. 6-28-97 0600 CST--rainfall caused doubtful data on Mesonet Bowen Ratio (ER05). 6-29-97 John Norman repaired/dessicated Mesonet Bowen Ratio (ER05). Good data should begin about 1400 hrs. 6-30-97 At rangeland Bowen Ratio station (ER01), changed dessicants on back of analyzer at 1440 CST. At Mesonet Bowen Ratio (ER05), changed dessicants on bakc of anlayzer at 1510 CST. 7-1-97 Rangeland Bowen Ratio (ER01). When we changed soda lime on 6-30-97 at 1440 CST Flag 5 was left high. Changed Flag 5 to 0 when we finished the "zero" and "span" adjustments at 0850 CST. Mesonet Bowen Ratio (ER05). Performed "zero" and "span" adjustments between 1200-1230 CST. 7-2-97 Re-zeroed the flux site Bowen Ratio (ER01) system at 0940 CST. 7-14-97 0816-0819 CST changed thermocouples on Flux Site Bowen Ratio (ER01) site. Pumps turned off at 0820 to change chemicals. 0820-0840, did scrub and zero after changing magnesium perchlorate in the tubes. 0905-0930 CST changed chemicals, did scrub and zero on Mesonet site Bowen Ratio (ER05). 7-29-97 1241 CST did a zero and span on CO2 and H20 (the field notes do not say which system) 1310 CST did a zero and span on CO2 and H20 (the field notes do not say which system) 8-8-97 0837 CST F2 (ER01) Bowen Ratio station, noticed that flow was only 2 cc/min on both reference and sample flow meters...Adjusted back to 4 cc/min. Noticed that display on LI-6262 was showing "LI-6262 2.01" and "CO2/H2O Analyzer", which is not what we normally encounter. Tried to step through the functions menu on 6262 but could not. Downloaded the data from the station and noticed that Battery Voltage was only 8.8!! 8-25-97 0800 CST re-programed CO2 and H2O calibration coefficients into the LI-6262 at the Mare Barn site (ER01). The 6262 still appears to be acting up. No regular display. Also re-zeroed. 0900 CST Bowen Ratio system at Mesonet site (ER05): a pump has gone bad (not the one inside the 6262) allowing only one side to be extracted at a time. Need to fix this problem. Turned pumps off at 0906 CST. Turned 6262 off as well. 9-9-97 1249 CST changed magnesium perchlorate and air filters on F2 (mare barn or ER01) Bowen Ratio system. Noticed that one of the wires on the lower arm thermocouple is broken. 9-10-97 Replaced fine-wire thermocouple on lower arm of Bowen Ratio system F2 (ER01) at 0855 CST. 10-6-97 0930 CST downloaded Bowen Ratio data from F2 (ER01) then turned off the station.

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Last update:Thu Jan 28 09:34:12 EST 1999 Page Info: Hydrology Data Support Team -- hydrology-disc@listserv.gsfc.nasa.gov Web Curator: Stephen W Berrick NASA official: Steve Kempler, DAAC Manager -- Steven.J.Kempler@nasa.gov