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United States Department of Agriculture

Agricultural Research Service

Facilities-Little Washita River Watershed Description
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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


Last Modified: 8/9/2005
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