BOREAS AES MARS II Surface Meteorological Data Summary Canadian AES personnel collected several data sets related to surface and atmospheric meteorological conditions over the BOREAS region. This data set contains 15-minute meteorological data from six MARSII meteorology stations in the BOREAS region in Canada. Parameters include site, time, temperature, dewpoint, visibility, wind speed, wind gust, wind direction, two cloud groups, precipitation, and station pressure. Temporarily, the data cover the period of May to September 1994. Geographically, the stations are spread across the provinces of Saskatchewan and Manitoba. The data are provided in tabular ASCII files. Table of Contents * 1 Data Set Overview * 2 Investigator(s) * 3 Theory of Measurements * 4 Equipment * 5 Data Acquisition Methods * 6 Observations * 7 Data Description * 8 Data Organization * 9 Data Manipulations * 10 Errors * 11 Notes * 12 Application of the Data Set * 13 Future Modifications and Plans * 14 Software * 15 Data Access * 16 Output Products and Availability * 17 References * 18 Glossary of Terms * 19 List of Acronyms * 20 Document Information 1. Data Set Overview 1.1 Data Set Identification BOREAS AES MARS II Surface Meteorological Data 1.2 Data Set Introduction This data set contains 15 minute meteorological data from six Meteorological Automatic Reporting System II (MARSII) meteorology stations in the BOReal Ecosystem-Atmosphere Study (BOREAS) region in Canada. Parameters include site, time, temperature, dewpoint, visibility, wind speed, wind gust, wind direction, two cloud groups, precipitation and station pressure. BOREAS received data for the Intensive Field Campaigns (IFCs) of 1994. 1.3 Objective/Purpose These monitoring sites were established by Environment Canada to provide hourly weather reports to 1) provide input to the operational program of forecasts and warnings, 2) provide input to operational weather prediction models, and 3) provide climate data. The frequency of observation was increased to 15 minutes at the request of BOREAS. Data collection for BOREAS occurred during IFCs 1, 2, and 3 in 1994. 1.4 Summary of Parameters Parameters include site, time, temperature, dewpoint, visibility, wind speed, wind gust, wind direction, two cloud groups, precipitation, and station pressure. 1.5 Discussion Generally, these stations were installed well before BOREAS began, and they conform to Environment Canada's criteria for accuracy and exposure. 1.6 Related Data Sets BOREAS AFM07 SRC Surface Meteorological Data BOREAS AES Campbell Scientific Surface Meteorological Data BOREAS AES READAC Surface Meteorological Data 2. Investigator(s) 2.1 Investigator(s) Name and Title G. Barrie Atkinson (retired) BOREAS Project Scientist 2.2 Title of Investigation Environment Canada 15-minute MARSII Data 2.3 Contact Information Contact 1 G. Barrie Atkinson (retired) BOREAS Project Scientist Environment Canada Winnipeg, Manitoba Canada (204) 983-6059 (204) 983-4884 (fax) Contact 2 Barry Funk Supervisor, Special Programs Environment Canada Winnipeg, Manitoba Canada R3C (204) 983-2018 (204) 984-2072 (fax) Barry.Funk@ec.gc.ca Contact 3 David Knapp Raytheon STX Corporation NASA GSFC Greenbelt, MD (301) 286-1424 (301) 286-0239 (fax) David.Knapp@gsfc.nasa.gov 3. Theory of Measurements None given. 4. Equipment 4.1 Sensor/Instrument Description Parameter Instrument Instrument Description Pressure A Negretti & Zambra aneroid barometer Cloud B Atmospheric and Environment Service (AES) rotating beam ceilometer K AES laser ceilometer Q1211 L AES laser ceilometer Q1212 Visibility C Sperry videograph, type B Temperature D AES dewcel probe, type E Radiation shield E wooden Stevenson screen, wooden stand Precipitation tipping bucket F AES tipping bucket rain gauge (TBRG) (summer only) weighing gauge G Fischer & Porter (F&P) with F&P Nipher shield (winter only) Wind Speed detector H AES/SD-B, MARS II type U2A Direction detector I AES/DD-C, MARS II type U2A Tower J Hossick tilting 4.1.1 Collection Environment The instrumentation was operated at ambient environmental conditions during the data period. 4.1.2 Source/Platform The following table lists the instrumentation at the various MARS II stations by the codes given in Section 4.1. Stations Instrument WEQ WDC WJD WOY WSZ WVT Pressure sensor A A A A A A Cloud sensor B K - L B K Visibility sensor C - C C C C Temperature/dewpoint sensor D D D D D D height (cm) 116 112 120 120 118 120 radiation shield E E E E E E Precipitation Tipping Bucket F F F F F F rim height (cm) 75 75 75 75 75 75 Weighing gauge G - - G - - rim height (cm) 230 201 Anemometer speed sensor H H H H H H cup height (m) 10 10 16 10 10 10 direction sensor I I I I I I Tower J J J J J J 4.1.3 Source/Platform Mission Objectives None given. 4.1.4 Key Variables The key variables in these data are: site, time, temperature, dewpoint, visibility, wind speed, wind gust, wind direction, 2 cloud groups, precipitation and station pressure. 4.1.5 Principles of Operation None given. 4.1.6 Sensor/Instrument Measurement Geometry None given. 4.1.7 Manufacturer of Sensor/Instrument None given. 4.2 Calibration 4.2.1 Specifications None given. 4.2.1.1 Tolerance None given. 4.2.2 Frequency of Calibration None given. 4.2.3 Other Calibration Information None given. 5. Data Acquisition Methods Since there is no provision for onboard storage of observations, each station was telephoned approximately every 15 minutes from a computer in Winnipeg. 6. Observations 6.1 Data Notes Not applicable. 6.2 Field Notes The following was obtained from the inspection books. Obviously some visits have not been recorded. Normal practice is to disable the TBRG for the winter and to disable the weighing gauge for the summer. WEQ Swan River, MB Inspection 21-Mar-1994 All instruments were cleaned and calibrated. Pressure averaged +0.235 mb different from the inspection barometer for 10 readings. Clouds were too high and too few to verify operation of the ceilometer. Temperature averaged 0.0 °C different from inspection psychrometer for 9 readings. The dewpoint was +1.2 deg °C different. A newly calibrated tipping bucket bridge was installed and checked. Bearings in both the speed and direction wind detectors were replaced. Visit 18-May-1995 F&P taken out of service and TBRG installed for the summer. WDC Uranium City, SK Inspection 06-Dec-1993 All instruments were cleaned and calibrated. Pressure averaged -0.42 mb different from the inspection barometer for 10 readings. The wind speed detector and the dewcel were changed as per their replacement schedule. The wind direction indicator was still in good condition. WJD Grand Rapids, MB Inspection 20-Apr-1993 All instruments were cleaned and calibrated. Pressure averaged -0.55 mb different from the inspection barometer. Air temperatures were within +/- 0.2 °C, and dewpoint temperatures were within +/- 0.7 degrees °C. Inspection 22-Jul-1994 All instruments were cleaned and calibrated. Pressure averaged +0.654 mb different from the inspection barometer. Inspection 29-Mar-1995 All instruments were cleaned and calibrated. Pressure averaged +0.71 mb different from the inspection barometer for six comparisons. The dewpoint was reading higher than temperature. The problem was traced to an out-of-alignment temperature bridge card, which was replaced with a spare. Then psychrometer/MARS II comparisons were well within limits. Visit 24-May-1995 TBRG installed for the summer. WOY Wynard, SK Inspection 20-Jul-1994 All instruments were cleaned and calibrated. The dewcel was changed. The amplifier in the videograph was replaced, and the videograph is now back in service. Inspection 24-Nov-1994 All instruments were cleaned and calibrated. The dewcel was changed. The aneroid barometer was replaced. The nipher shield was placed on the F&P, and it is now in service. The TBRG was removed for the winter. WSZ Fisher Branch, MB Inspection 17-Mar-1993 All instruments were cleaned and calibrated. Pressure averaged -0.25 mb different from the inspection barometer for 10 comparisons. Temperature comparisons were within 0.2 degrees C and the dewpoint was within 1.0 degrees C. Visit 21-Apr-1995 The TBRG was installed for the summer. WVT Buffalo Narrows SK Inspection 20-Jul-1992 All instruments were cleaned and calibrated. Temperature comparisons were on average -0.2 degrees C and the dewpoint was on average +0.2 degrees C. Wind speed detector was replaced. Inspection 12-Aug-1994 All instruments were cleaned and calibrated, and found to be within limits. Wind speed detector was replaced. TBRG was leveled. Visit 22-Nov-1994 Wind system was malfunctioning. Wind speed detector was replaced. TBRG was taken out of service for the winter. Inspection 12-Dec-1994 All instruments were cleaned and calibrated, and found to be within limits. 7. Data Description 7.1 Spatial Characteristics 7.1.1 Spatial Coverage The following is a list of stations covered by the data. Latitude and longitude are given in degrees and minutes. A brief description of each station follows. ID Name Latitude Longitude Elevation (meters) WEQ Swan River, MB 52° 07’ N 101° 14’ W 334.8 WDC Uranium City, SK 59° 34’ N 108° 29’ W 318.2 WJD Grand Rapids, MB 53° 11’ N 99° 16’ W 222.5 WOY Wynard, SK 51° 46’ N 104° 12’ W 560.1 WSZ Fisher Branch, MB 51° 05’ N 97° 33’ W 253.0 WVT Buffalo Narrows, SK 55° 50’ N 108° 26’ W 434.0 WEQ Swan River, MB The autostation is located at the Swan River Airport in the Swan River Valley. Exposure is open in all directions. Instruments are located on a level, grassed surface. The Valley runs in a southwest to northeast direction with the Porcupine Mountains to the north-northwest and the Duck Mountains to the south- southeast. The Valley bottom is fairly flat cropland with the occasional bluff of trees. WDC Uranium City, SK The instrument area is located on a 23-m-wide strip of grass running northeast from the airport terminal building. This grassy area is sandwiched between a gravel vehicle parking area to the southeast and a paved aircraft parking ramp to the northwest. The instrument exposure is fair, with some sheltering to the northeast by the Eldorado warehouse and to the west by the air terminal building. Airflow from the north and south is generally unrestricted, although the south side of the instrument area is bounded by a 2-m security fence. The instruments are subject to occasional "propwash" from aircraft in the parking area immediately to the north. The airport is located approximately 15 km to the north of Lake Athabaska, and the surrounding countryside is quite hilly, and covered with evergreen and birch trees. Numerous small lakes dot the area. WJD Grand Rapids, MB The site is located in the town of Grand Rapids, just north of the intersection of the main thoroughfare of the town and Highway #6. Instrument exposure is very good. Instruments are located in a 30-m-square area surrounded by a 1.2-m- high chain link fence. Low brush has been cleared to a distance of approximately 60 m in all directions. The surrounding terrain is flat, with mixed forest, scrub bush, and muskeg. The mouth of the Saskatchewan River, where it flows into the north basin of Lake Winnipeg, is approximately 1 km to the southeast. These two bodies of water, particularly open water on faster flowing sections of the river, contribute to high year-round humidities, frequent fog conditions, and heavy hoarfrost in the winter months. The wind exposure is excellent in all directions because the 16-m wind mast extends well above the surrounding treetops. In addition, the nearest tall trees (5-10 m) are at least 70 m away. WOY Wynard, SK The autostation is located at 505 5th St. W, at the corner of 5th St and Highway #16, in the southwest corner of the town of Wynard (population approximately 2200). The station is situated on a parcel of land that is approximately 98 m (north-south) by 152 m (east-west), grassed, and surrounded by a fence. Buildings from the former manned program are at the west end of the property, and the instruments are located in a 30-m by 30-m plot near the center of the property, with the wind tower near the east end. The immediate surroundings are: North - residential street, mostly one story single family dwellings; East - open school yard; South - Provincial Highway #16; and West - the local golf course. Farther out to the north and east are residential and business districts. Farther to the south and west is mostly open crop and pasture land. The Quill lakes are located to the west and northwest, with the closest shoreline approximately 8 km away. These lakes are very shallow and can produce local low clouds during periods of northwest winds. The local terrain is mostly gently rolling farmland, open except for an occasional farm shelterbelt or small wooded area in a depression. The topography has a gentle slope from the Touchwood Hills (elevation 670 m) some 10 km to the south, to the shores of the Quill lakes to the northwest (elevation 533 m). The site offers an excellent exposure from all directions and is representative of the area. WSZ Fisher Branch, MB The station is situated at the southeast end of the 240 (north-south) by 90 (east-west) m AES reserve. The instrument area is a 25 m square grass on gravel area in a rural setting and has good exposure. The reserve has been cleared of trees, but a line of trees borders the reserve on the western and northern edges. The surrounding countryside is generally flat farmland, with about 30% tree coverage. Lake Winnipeg lies about 50 km to the east and Lake Manitoba about 70 km to the west. WVT Buffalo Narrows, SK The autostation instruments are colocated with the manned site on a large (60 by 60 m) grass-covered area surrounded by a wire security fence situated along the southwest side of the Buffalo Narrows airport. The airport is located on a broad peninsula that extends northeastward into Churchill Lake. Topography within a 30-km radius is 50% thickly treed bush and muskeg, and 50% large and small lakes of the Churchill River system. The wind tower is located near the runway, with open exposure in all directions. 7.1.2 Spatial Coverage Map Not available. 7.1.3 Spatial Resolution These data represent point measurements at the given locations. 7.1.4 Projection Not applicable. 7.1.5 Grid Description Not applicable. 7.2 Temporal Characteristics 7.2.1 Temporal Coverage Data were collected at the sites from 24-May-1994 through 25-Jun-1994, from 18- Jul-1994 through 18-Aug-1994, and from 25-Aug-1994 through 20-Sep-1994. 7.2.2 Temporal Coverage Map Not available. 7.2.3 Temporal Resolution Data are reported approximately every 15-minutes. 7.3 Data Characteristics Data characteristics are defined in the companion data definition file (marsii94.def). 7.4 Sample Data Record Sample data format shown in the companion data definition file (marsii94.def). 8. Data Organization 8.1 Data Granularity All of the MARS II Surface Meteorological Data are contained in one dataset. 8.2 Data Format(s) The data files contain a series of numerical and character fields of varying length separated by commas. The character fields are enclosed within single apostrophe marks. There are no spaces between fields. Sample data records are shown in the companion data definition file (marsii94.def). 9. Data Manipulations 9.1 Formulae None given. 9.1.1 Derivation Techniques and Algorithms Not applicable. 9.2 Data Processing Sequence 9.2.1 Processing Steps Data were received by BOREAS in raw form with 1 monthís worth of data per station contained in each raw file. They were extracted from the files using a C program provided by AES. The output of this program was a tab delimited file that contained 1 monthís worth of processed data for one station. BOREAS Information System (BORIS) personnel loaded these data into a relational data base and converted the units as needed to match those of other data sets. 9.2.2 Processing Changes 'RAW' data had many extraneous characters that were removed. The records were checked for completeness. 9.3 Calculations No calculations were performed on the data. 9.3.1 Special Corrections/Adjustments None given. 9.3.2 Calculated Variables None given. 9.4 Graphs and Plots None given. 10. Errors 10.1 Sources of Error Snow measurements (Fisher) are known to be poor. 10.2 Quality Assessment 10.2.1 Data Validation by Source None given. 10.2.2 Confidence Level/Accuracy Judgment None given. 10.2.3 Measurement Error for Parameters None given. 10.2.4 Additional Quality Assessments None given. 10.2.5 Data Verification by Data Center An automated quality assurance program was run on this data set to identify anomalies, including sudden jumps or drops (“spikes”) in the data. Some of these problems are identified in Section 11.2. 11. Notes 11.1 Limitations of the Data None given. 11.2 Known Problems with the Data AIR_TEMP_1_5_M | From | To | Prob |SITE_NAME |SUB_SITE | DATE_OBS | DATE_OBS | Data ---------------------------------------------------------------------------- Spike |REG-999-WOY04 |STAFF-AES04 |05-JUN-94 |05-JUN-94 | 20.5 - 40.8 Spike |REG-999-WOY04 |STAFF-AES04 |05-JUN-94 |05-JUN-94 | 40.8 - 18 DEW_TEMP_1_5_M Some large spikes were identified for these data at the WDC and WVT sites. These high values are most likely not valid. Spike |REG-999-WDC04 |STAFF-AES04 |05-AUG-94 |06-AUG-94 | 17.2 - 52 Spike |REG-999-WDC04 |STAFF-AES04 |06-AUG-94 |06-AUG-94 | 52 - 17.1 High |REG-999-WDC04 |STAFF-AES04 |06-AUG-94 |06-AUG-94 | 52 Spike |REG-999-WVT04 |STAFF-AES04 |22-JUL-94 |22-JUL-94 | 26.1 - 9.8 Spike |REG-999-WVT04 |STAFF-AES04 |30-JUL-94 |30-JUL-94 | 15.2 - 51.3 Spike |REG-999-WVT04 |STAFF-AES04 |30-JUL-94 |30-JUL-94 | 51.3 - 22.6 High |REG-999-WVT04 |STAFF-AES04 |30-JUL-94 |30-JUL-94 | 51.3 MEAN_WIND_SPEED_10M_10MIN There was an intermittent problem from May 1994 to September 1994 at WEQ. The values greater than 51 are probably not valid. Spike |REG-999-WEQ04 |STAFF-AES04 |27-MAY-94 |27-MAY-94 | 51.286 - .668 High |REG-999-WEQ04 |STAFF-AES04 |27-MAY-94 |27-MAY-94 | 51.286 There was an intermittent problem from 31-Aug-1994 to 04-Sep-1994 at WVT. Spike |REG-999-WVT04 |STAFF-AES04 |31-AUG-94 |31-AUG-94 | 0 - 51.235 High |REG-999-WVT04 |STAFF-AES04 |31-AUG-94 |31-AUG-94 | 51.235 Spike |REG-999-WVT04 |STAFF-AES04 |31-AUG-94 |31-AUG-94 | 51.183 - 1.285 High |REG-999-WVT04 |STAFF-AES04 |31-AUG-94 |31-AUG-94 | 51.183 VISIBILITY_INDEX This column contains many spikes. One example of this is listed below. Users should be cautious about using this parameter. See Section 7.3.2 for more information. Spike |REG-999-WSZ04 |STAFF-AES04 |20-SEP-94 |20-SEP-94 | 994 - 5 GUST_10M_10MIN A number of spikes were found at the WEQ site that appear to be related to the wind speed spikes at this site. Similar spikes were found at the WJD and WVT sites. Spike |REG-999-WEQ04 |STAFF-AES04 |02-SEP-94 |02-SEP-94 | 51.286 - .617 High |REG-999-WEQ04 |STAFF-AES04 |02-SEP-94 |02-SEP-94 | 51.286 MEAN_WIND_DIR_10M_10MIN No serious problems were found with these data. ACCUM_PRECIP_TIP Extremely large values greater than 1900 were found for the WEQ and WVT sites. Spike |REG-999-WEQ04 |STAFF-AES04 |03-AUG-94 |03-AUG-94 | 1944.6 - 17.8 High |REG-999-WEQ04 |STAFF-AES04 |03-AUG-94 |03-AUG-94 | 1944.6 Spike |REG-999-WVT04 |STAFF-AES04 |21-JUN-94 |21-JUN-94 | 106.4 - 1927.2 Spike |REG-999-WVT04 |STAFF-AES04 |21-JUN-94 |21-JUN-94 | 1927.2 - 106.4 STN_PRESS Extremely low values were seen in the data for the WDC and WVT sites. Spike |REG-999-WDC04 |STAFF-AES04 |03-AUG-94 |03-AUG-94 | 9.87 - 98.74 Low |REG-999-WDC04 |STAFF-AES04 |03-AUG-94 |03-AUG-94 | 9.87 The original data appears to have a missing digit. The 9.87 value should probably be 98.70. Spike |REG-999-WVT04 |STAFF-AES04 |17-JUN-94 |17-JUN-94 | 26.96 - 96.95 Low |REG-999-WVT04 |STAFF-AES04 |17-JUN-94 |17-JUN-94 | 26.96 It is assumed that the value of 26.96 should really be 96.96. 11.3 Usage Guidance None given. 11.4 Other Relevant Information None given. 12. Application of the Data Set None given. 13. Future Modifications and Plans None given. 14. Software 14.1 Software Description C program from AES for unpacking and converting RAW data files. 14.2 Software Access Contact: Barry Funk Supervisor, Special Programs Environment Canada Winnipeg, Manitoba Canada (204) 983-2018 (204) 984-2072 (fax) Barry.Funk@ec.gc.ca 15. Data Access 15.1 Contact Information Ms. Beth Nelson BOREAS Data Manager NASA GSFC Greenbelt, MD (301) 286-4005 (301) 286-0239 (fax) Elizabeth.Nelson@gsfc.nasa.gov 15.2 Data Center Identification See Section 15.1. 15.3 Procedures for Obtaining Data Users may place requests by telephone, electronic mail, or fax. 15.4 Data Center Status/Plans The AES MARSII data are available from the Earth Observing System Data and Information System (EOSDIS) Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC). The BOREAS contact at ORNL is: ORNL DAAC User Services Oak Ridge National Laboratory (865) 241-3952 ornldaac@ornl.gov ornl@eos.nasa.gov 16. Output Products and Availability 16.1 Tape Products None. 16.2 Film Products None. 16.3 Other Products Tabular American Standard Code for Information Interchange (ASCII) files. 17. References 17.1 Platform/Sensor/Instrument/Data Processing Documentation None given. 17.2 Journal Articles and Study Reports Sellers, P. and F. Hall. 1994. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version 1994-3.0, NASA BOREAS Report (EXPLAN 94). Sellers, P. and F. Hall. 1996. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version 1996-2.0, NASA BOREAS Report (EXPLAN 96). Sellers, P. and F. Hall. 1997. BOREAS Overview Paper. JGR Special Issue (in press). Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem-Atmosphere Study: 1994 Operations. NASA BOREAS Report (OPS DOC 94). Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem-Atmosphere Study: 1996 Operations. NASA BOREAS Report (OPS DOC 96). Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B. Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year. Bulletin of the American Meteorological Society. 76(9):1549-1577. Sellers, P.J., F.G. Hall, R.D. Kelly, A. Black, D. Baldocchi, J. Berry, M. Ryan, K.J. Ranson, P.M. Crill, D.P. Lettenmaier, H. Margolis, J. Cihlar, J. Newcomer, D. Fitzjarrald, P.G. Jarvis, S.T. Gower, D. Halliwell, D. Williams, B. Goodison, D.E. Wickland, and F.E. Guertin. 1997. BOREAS in 1997: Experiment Overview, Scientific Results and Future Directions, JGR, BOREAS Special Issue, 102(D24), Dec. 1997, pp. 28731-28770. 17.3 Archive/DBMS Usage Documentation None. 18. Glossary of Terms None. 19. List of Acronyms AES - Atmospheric and Environment Service AFM - Airborne Fluxes and Meteorology ASCII - American Standard Code for Information Interchange BOREAS - BOReal Ecosystem-Atmosphere Study BORIS - BOREAS Information System CGR - Certified by Group CPI - Checked by PI CPI-??? - CPI but questionable DAAC - Distributed Active Archive Center EOS - Earth Observing System EOSDIS - EOS Data and Information System F&P - Fisher & Porter GSFC - Goddard Space Flight Center IFC - Intensive Field Campaign MARSII - Meteorological Automatic Reporting System II MB - Manitoba NASA - National Aeronautics and Space Administration NSA - Northern Study Area ORNL - Oak Ridge National Laboratory PANP - Prince Albert National Park PI - Principal Investigator PRE - Preliminary READAC - Remote Environmental Automated Data Acquisition Concept SK - Saskatchewan SSA - Southern Study Area TBRG - Tipping Bucket Rain Gauge T/RH - Temperature / Relative Humidity URL - Uniform Resource Locator 20. Document Information 20.1 Document Revision Date Written: 25-Jul-1995 Last updated: 02-Jul-1998 20.2 Document Review Date(s) BORIS Review: 12-Jun-1998 Science Review: 20.3 Document ID 20.4 Citation These data were collected by the Atmospheric Environment Service of Environment Canada. The efforts in providing these data are greatly appreciated. 20.5 Document Curator 20.6 Document URL KEYWORDS --------- SURFACE METEOROLOGY TEMPERATURE RELATIVE HUMIDITY WIND SPEED WIND DIRECTION ATMOSPHERIC PRESSURE PRECIPITATION DEWPOINT CLOUD COVER AES_MARSII.doc 07/07/98