CEOP/EOP-1 GAPP SGP Hourly Soil Heat Flux, Moisture, and Temperature Data Set

1.0 Contact Information

1.1 UCAR/JOSS Contact

   Steven F Williams
   Data Specialist
   P.O. BOX 3000
   Boulder, CO, USA, 80307-3000

   Telephone: 303-497-8987
   Facsimile: 303-497-8158

   E-Mail Address:

1.2 ARM EBBR Contact

   David R. Cook
   Argonne National Laboratory
   9700 South Cass Avenue
   Building 203
   Argonne, IL 60439.
   Phone: (630) 252-5840
   FAX: (630) 252-5498

1.3 ARM SWATS Contact

   Chad Bahrmann 
   University of Oklahoma 
   100 E. Boyd St., Rm. 1110 
   Norman, OK 73019-1011 
   Phone: (405) 325-1855 
   Fax: (405) 325-7614 

2.0 General Description

This data set contains the Coordinated Enhanced Observing Period (CEOP)
Enhanced Observing Period 1 (EOP-1) Global Energy and Water Cycle Experiment
(GEWEX) Americas Prediction Project (GAPP) Southern Great Plains (SGP)
Hourly Soil Heat Flux, Moisture, and Temperature Data Set. This data set contains
hourly soil heat flux (0, 5cm depth), soil temperature (5, 15, 25, 35, 60, 85, 125,
175cm depths), and soil moisture (5, 15, 25, 35, 60, 85, 125, 175cm depths) 
data. This data set contains hourly data from 24 Department of
Energy (DOE) Atmospheric Radiation Measurement (ARM) Southern Great Plains
(SGP) stations for the CEOP EOP-1 time period (01 July 2001 to 30 September
2001). The University Corporation for Atmospheric Research/Joint Office for
Science Support (UCAR/JOSS) did not perform quality control processing on this
data set.

3.0  Detailed Data Description

The data comprising this data set are also available on-line in native format at
under the heading CEOP EOP-1 "Native Format" Reference Site Data Sets, GAPP.

This composite data set is composed of data from two sources which report
data at different frequencies. It was developed by the merging of soil heat
flux data from the Energy Balance Bowen Ratio (EBBR), and soil temperature
and moisture data from the Soil Water and Temperature System (SWATS). These 
stations are located at many of the ARM SGP Extended Facilities in southern 
Kansas and northern Oklahoma.

3.1 SGP Algorithms

The algorithms used to produce the GAPP SGP native format data are not 
currently available. 

This hourly data set was formed by extracting the top of the hour observations
from the native format data. More information regarding the sites can be found
under the CEOP Reference Site Station Characteristics link on the UCAR/JOSS
CEOP Data Management page at

3.2 Station Information

The following is a complete description of the station information provided
with this CEOP GAPP SGP data set. Table 1 details the station list parameters.
GAPP SGP values for each parameter are listed in brackets at the end of each
line. The beginning and ending dates for the period of coverage are in
Universal Time Coordinated (UTC). The Identification Type field is network
dependent and indicates the source of the Identification field. The Occurrence
field is an integer value used to indicate co-located stations. Note that when
a particular parameter is unknown for a station, either a blank, a question
mark, or all 9's will appear in that parameter's position. For a complete list
of Country, State, and County values, refer to the document in the references
(Section 5.0). Possible platform types and frequency values are listed in
Tables 2 and 3, respectively. Note that only those platform types present in
the CEOP EOP-1 data have been listed.

Table 1

Parameter                Description
---------                -----------
Identification           ID in data.        [SGP]
Identification Type      Internal ID number type.  [32]
Latitude                 Station Latitude.  [48.31000]
Longitude                Station Longitude. [-105.10000]
Occurrence               Station occurrence. [0]
Lat/Lon Accuracy         Number of digits accuracy 
                         in lat/lon values.  [2]
Name                     Expanded station name. [GAPP:SGP]
Commissioned Flag        `(C)' indicates commissioned station,
                         `(N)' indicates station which is NOT
                         commissioned. [(N)]
Begin Period of Coverage Beginning date of period of coverage
                         (YYYYMMDD). [20010701]
End Period of Coverage   End date of period of coverage
                         (YYYYMMDD). [20010930]
Country                  Country in which station is located. [US]
State                    State code.  [30]
County                   County code. [???]
UTC offset               Hour Offset from UTC time. [0.00]
DST switch               'y' indicates station does switch to
                         Daylight Savings Time (DST). 'n' indicates 
                         station does not switch to DST.   [n]
Platform type            Collection Platform. See Table 2. [264] 
Reporting Frequency      Frequency of data collection.  [30min]
Elevation                Station elevation. [634]
Fixed/Mobile flag        Flag indicating if station has fixed
                         location. 'f' indicates a fixed station.
                         'm' indicates a mobile station. [f]

Table 2

Platform Type  Description
-------------  -----------
264            CEOP Reference Site Platform

Table 3                                            
Reporting Frequency
varies by site

3.3  Detailed Format Description
The CEOP EOP-1 GAPP SGP Hourly Soils Data Set contains 11 metadata
parameters followed by parameter values for 26 soils depths (i.e.,
0,2,3,4,5,6,7,8,10,15,16,20,25,30,32,35,40,45,50, 60,64,85,100,125,150,175
cm). The metadata parameters describe the station location and time at
which the data were collected and the record type. The record type
describes the type of data found on that record and is described in the
Table 4 below. The time of observation is reported both in Universal Time 
Coordinated (UTC) Nominal and UTC actual time.  Days begin at UTC 0100 and
end at UTC 0000 the following day. Note that missing parameter values are
indicated by "-999.99". The table below details the parameters in each

Parameters                   Units 
----------                   -----
Date of Observation          UTC Nominal 
Time of Observation          UTC Nominal 
Date of Observation          UTC Actual
Time of Observation          UTC Actual
CSE Identifier               Abbreviation of CSE name
Reference Site Identifier    Abbreviation of Site name
Station Identifier           Reference Site Dependent 
Latitude                     Decimal degrees, South is negative
Longitude                    Decimal degrees, West is negative
Station Elevation            Meters 
Record Type                  Type of data in current record.
                             See Table 4.
Parameter Values             Parameter Values for 26 depths.

Table 4

Record Type    Description
-------------  -----------
SoilHtFlux     Soil heat flux in W/m2
SoilMoist      Volumetric soil water content in percent
SoilTemp       Soil temperature in Celsius

3.4  Data Remarks

This data set contains only the hourly observations for the CEOP EOP-1
time period. This data set is also available on-line in native format at under the link "CEOP EOP-1 Reference
Site Data Sets".

4.0  Quality Control Processing

UCAR/JOSS performed limited gross limit and visual checks on this data set.
No data values have been changed.

4.1 ARM Data Quality Reports

4.2  ARM EBBR Data Quality Reports

4.2.1 ARM_DQR_20010401_20010823.html
4.2.2 ARM_DQR_20010401_20011005.html
4.2.3 ARM_DQR_20010401_20010823.html
4.2.4 ARM_DQR_20010401_20010823.html

       ARM_DQR is the type of file
       20010401 is the start date of the earliest quality report
                in the file
       20010823 is the end date of the latest quality report in 
                the file

4.3 ARM SWATS Data Quality Reports


5.0  References

Bolton, D., 1980: The computation of equivalent potential temperature.,
   Mon. Wea. Rev., 108, pp 1046-1053.

Department of Commerce - National Institute of Standards and Technology
   (NIST), 1985: Federal Information Processing Standards Publication)
   10-3 Countries, Dependencies, & Areas of Special Sovereignty.
   Department of Commerce - NIST, Washington, DC.

Energy Balance Bowen Ratio (EBBR),; September 6, 1999

FIFE Bowen Ratio Surface Flux: Smith Data Set Guide Document,;
   September 8, 1999 

Wexler, A., and W. A. Wildhack, 1963:  Humidity and Moisture.
   Vol. 3: Fundamentals and Standards.  Reinhold Publ. Corp., 562 pp.