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data was collected from various locations throughout Beacon, Taylor, Wright and Victoria Valleys. These files contain data
for the Lake Vanda meteorology station.
This is part of a multi-part data set.
After retrieving this data (usually every January), the parameters that are recorded are processed from level 0 (raw) to level
1 (processed, provided on the web). The raw data file descriptions and task lists summarize what was done to get from
level 0 to level 1 for all station found at the following address:
http://www.mcmlter.org/data/meteorology/tasks/task_lists.htm
Citations Doran, Peter T., Gayle L. Dana, Jordan T. Hastings and Robert A. Wharton, Jr. 1995.
McMurdo Dry Valleys Long-Term Ecological Research (LTER): LTER automatic weather network (LAWN).
Antarctic Journal of the U.S. 30(5): 276-280.
Notes Data contained in these files has been subjected to quality
control standards imposed by the investigator. The user of this data should be
aware that, while efforts have been taken to ensure that these data are of the
highest quality, there is no guarantee of perfection for the data contained
herein and the possibility of errors exists. If you encounter questionable data,
please contact the MCM LTER data manager (telephone: 303-492-4639) so that the
data can be corrected or qualified. Thus, these data may be modified and future
data will be appended.
request of Thomas Nylen, she did some fine-tuning of the data. Revisions included:
1. Removal and flagging of WDir and WDirStd values on Nov 25, 1994 @ 9:20. Since windspeed was zero (0),
it made no sense to have values for wind direction.
2. Addition of PAR values between Dec 30, 1994 @ 17:00 and Jan 20, 1995 @ 15:00.
On June 1, 2000, the 1999-2000 data was posted. In the process, Denise Steigerwald changed thelayout of
the files so that they were sorted by category (air temperatures, humidity, radiation,wind etc.) rather than by year.
Files containing monthly and daily averages were generated andminor adjustments were made to the metadata.
On June 1, 2000, relative humidity (RH) values were corrected for a systematic error in themeasurement created
by an instrument manufacturer error. All RH data with air temperaturesbelow freezing were corrected using the
vapor pressure over ice (rather than over water whichwas used initially). The error became quite large for very
cold temperatures (the correction couldgrow to around 30%). The formula used for the correction was:
RH_corr=RH_orig/((A*temp*temp)+(B*temp)+C)
where
RH_corr = corrected relative humidity
RH_orig = original relative humidity
temp = air temperature
A = 4.165E-5
B = 9.7E-3
C = 1.0
For example, with an air temperature of -2.3 and RH_orig of 50.6, the RH_corr will be 51.7.Records that
showed corrected RH values greater tha n or equal to 100 were changed to 99.99and flagged.
In June 2000, summary files were added to the web containing daily and monthly statistics.These were
generated by creating "views" of daily and monthly means, minimums, maximumsand counts of the
records represented in the Oracle database's meteorology tables.
In 2007, it was realized that the RH error was still present in parts of the dataset. Hasan Basagic made
the above corrections to the VAAM dataset for the date range 1/26/2004 11:00 - 12/16/2006 10:00 (101,277 records).
In September, 2007 the information manager (Chris Gardner) removed all old RH data and re-inserted then newly
calculated values and associated comments. The original files are archive in the 'submitted data' section of the
mcmlter server.
a longitude of 161.011 E, and an elevation of 296 meters above sea level. Descriptions of this and other
McMurdo Dry Valley meteorology stations can be found at
http://www.mcmlter.org/data/meteorology/locations/metlocs.html
Allow read to users: public
Basagic, Hassan
position name:Associated Researcher
near the mouth of the Onyx River. The station was set up to sample sensors every 30 seconds and send summary
statistics (for example, averages and maximums) to solid-state storage modules every 20 minutes between November
24, 1994 and December 30, 1994, every hour between December 30, 1994 and November 21, 1995, and every 15 minutes
thereafter. This has resulted in approximately 20 values being recorded for final storage in every output
interval.