GrazingLands Research Laboratory
A research lab of the
Agricultural Research Service,
United States Department of Agriculture.
ARS MICRONET DATA
The laboratory has a fully instrumented watershed on the Little Washita River covering an area of 236 sq miles (ARS does not own the land, but owns and maintains instruments and collects data). This watershed, probably one of the largest and best instrumented watersheds in the US, has been used as a super site in NASA Shuttle Missions and is playing a key role in the both remote sensing and climate change research. Central to this watershed research is the ARS MICRONET, a network of 42 weather stations spaced on an approximate 3 km grid across the watershed.
The daily climate data described herein are contributed by the Agricultural Research Service, Grazinglands Research Laboratory, El Reno, OK. The data is provided for the 42 ARS Micronet stations in the Little Washita River Watershed. The data consists of accumulated rainfall, relative humidity, air temperature at 1.5 m, solar radiation, and soil temperature at 5, 10, 15 and 30 cm below ground surface. A data quality indicator is provided for each data entry. The rainfall is collected with a tipping bucket rain gage. The tipping bucket was installed in 1997 and MICRONET data begins at that time. A
documentation file provides the necessary information on data units and quality indicators, as well as a
disclaimer.
Daily climate data in tabular form is available as described below.
The data is located at the following FTP address:
ftp://164.58.150.49/pub/micronet
The data documentation file (ads101.txt) is provided in the main directory: .../pub/micronet
The climate data is provided in sub-directories off the main directory. One sub-directory for each year and under that sub-directory another subdirectory for each month of the year. File names for the data are of the form:
Dsmmasss.yyy
where:
mm is the month number
sss is the station number
yyy is the last 3 digits of the year
The LAT.- LONG. coordinates of each station are given in a table and the approximate location is shown on a map of the Little Washita River Watershed. The contents and organization of each file is described in the data documentation file.
DOCUMENTATION
Format for the ARS micronet 24-hr summary data files
Version: ads101
Date: 1998-03-30
This file describes the 24-hour summary data files for the ARS micronet. Each data file contains a line each for the version reference string, the 4-letter station ID and the date. These are followed by a data-header line and finally the data. The values represent a period of 24 hours corresponding to one day Central Standard Time (CST). version. This gives the version reference string for the file's data format and units. If either format or units are revised then the version will also be changed. (At the top of this document is the version for the specific file type that this document describes.)
station.
-------
The 4-character station ID of the file.
date
----
The year and month separated by "-". The date is followed by a blank line.
header
-------
The header line gives the organization for the data records. The header line contains the following:
STID - station ID
DM - day of the month (CST)
RAINt - total rainfall (mm)
SRADt - total solar radiation (MJoule)
RELH(a/x/n) - (ave/max/min) relative humidity (%)
TAIR(a/x/n) - (ave/max/min) air temperature @1.5 m (deg-C)
TS05(a/x/n) - (ave/max/min) soil temperature @05 cm depth (deg-C)
TS10(a/x/n) - (ave/max/min) soil temperature @10 cm depth (deg-C)
TS15(a/x/n) - (ave/max/min) soil temperature @15 cm depth (deg-C)
TS30(a/x/n) - (ave/max/min) soil temperature @30 cm depth (deg-C)
Most parameters are followed by a column of data with "Q" in the header. This indicates a column for the quality check (QC) character.
Data
----
Each line of data contains values associated with the header representation. For most parameters there is an associated QC character which represents the following:
g - good (passed QC tests - extremely low probability of error)
S - suspect (QC tests indicate some suspicion - low probability of error)
W - warning (several QC test failures - high probability of error)
F - failure (known error)
M - missing (data not received)
I - ignore
N - not installed
U - unknown
The QC character indicates the worst-case level of quality associated with the 24-hour summary period.
Sample Format
-------------
For reading the data line in FORTRAN 77 the following format statement may be used:
format (x, a4, 2x, i2, f8.2, x, a1, 19(f7.1, x, a1))
DISCLAIMER
The ARS Micronet data of the Little Washita River Watershed are accepted and used by the recipient upon the express understanding that the ARS and it's employees make no warranties, expressed or implied, concerning the accuracy, completeness, reliability or suitability for any one purpose, and that ARS and it's employees shall be under no liability to any person by reason of any use made thereof.
The ARS requests that the recipient of the ARS Micronet data does not distribute, publish or disseminate the data under the recipient's name without full and up-front acknowledgement of ARS as the source of the data, and that the recipient acknowledges the support and role of ARS in publications that use and are based on the ARS data. The data can be requested from the ARS Micronet Data manager at USDS-ARS, 7207 W. Cheyenne St., El Reno, OK 73036.
LITTLE WASHITA WATERSHED MAP 
TABLE OF STATION COORDINATES AND INSTALL/REMOVE DATES
SITE LATITUDE LONGITUDE ELEV. INSTALL RELOCATION DECOMMISSION
ID D M S D M S FT DATE DATE
110 35 00 51.55 N 98 00 20.06 W 1241 05/28/1997 01/26/2005
111 35 00 57.25 N 97 57 06.32 W 1181 06/10/1997 01/26/2005
121 34 57 31.28 N 97 53 54.51 W 1125 06/03/1997
122 34 58 22.25 N 97 57 09.95 W 1206 05/28/1997
123 34 58 16.07 N 98 00 20.25 W 1251 05/28/1997 01/26/2005
124 34 58 22.10 N 98 03 28.75 W 1270 06/02/1997
125 34 59 08.58 N 98 07 40.84 W 1375 05/28/1997 01/27/2005
130 34 57 23.31 N 98 17 04.74 W 1433 06/02/1997 02/01/2005
131 34 57 01.06 N 98 14 00.81 W 1503 06/02/1997
132 34 56 30. N 98 10 42. W 1400 05/28/1997
133 34 56 56.70 N 98 07 41.18 W 1410 06/10/1997
134 34 56 11.67 N 98 04 31.00 W 1257 06/10/1997
135 34 55 38.33 N 98 01 11.42 W 1198 05/29/1997
136 34 55 39.70 N 97 57 56.10 W 1126 06/11/1997
137 34 56 42.20 N 97 55 22.55 W 1140 05/29/1997 02/10/2005
144 34 52 44.34 N 97 55 01.56 W 1271 06/11/1997
145 34 53 03.20 N 97 58 16.89 W 1208 05/29/1997
146 34 53 07.37 N 98 01 22.98 W 1175 06/11/1997
147 34 54 24.82 N 98 04 32.69 W 1369 06/04/1997
148 34 53 56.98 N 98 07 41.31 W 1412 06/04/1997
149 34 53 54.38 N 98 10 51.13 W 1378 06/10/1997
150 34 54 21.93 N 98 15 03.79 W 1412 06/02/1997
151 34 54 47.56 N 98 17 33.97 W 1464 06/10/1997 02/01/2005
152 34 51 40.14 N 98 15 03.83 W 1363 06/16/1997
153 34 51 18.85 N 98 12 00.19 W 1358 06/16/1997
154 34 51 18.84 N 98 08 13.29 W 1288 06/11/1997
155 34 50 27.33 N 98 01 12.65 W 1280 06/04/1997
156 34 50 34.63 N 97 57 30.39 W 1302 06/04/1997
157 34 49 29.45 N 97 54 44.29 W 1340 06/03/1997
158 34 47 00.86 N 97 55 57.87 W 1340 06/03/1997
159 34 47 47.93 N 97 59 35.65 W 1439 06/11/1997
160 34 48 01.02 N 98 02 13.13 W 1349 06/04/1997
161 34 47 50.16 N 98 05 25.97 W 1336 06/04/1997
162 34 48 48. N 98 08 30. W 1310 06/11/1997
163 34 49 03. N 98 11 42. W 1340 06/16/1997
164 34 49 17.87 N 98 16 44.14 W 1340 06/16/1997 Feb 1, 2005
165 34 46 57.92 N 98 08 43.65 W 1313 06/16/1997
166 34 45 13.70 N 98 05 22.26 W 1281 06/16/1997
167 34 45 16.09 N 98 02 12.12 W 1304 06/16/1997
168 34 45 15.15 N 97 58 38.76 W 1370 06/04/1997
181 34 52 11.02 N 98 18 04.87 W 1319 06/02/1997
182 34 50 41.81 N 98 04 23.45 W 1212 06/04/1997
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