CEOP/EOP-1 NSA Hourly Surface Meteorology, Flux, and Radiation 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 Contacts

1.2.1 Surface meteorological data

   Michael Ritsche
   DOE/Argonne National Laboratory
   9700 S Cass AVE
   Argonne, IL 60439
   Telephone: 630-252-1554
   Facsimile: 630-252-5498
   E-Mail Address:

1.2.2 Radiation data

   Chris Cornwall
   National Oceanic and Atmospheric Administration
   Air Resources Lab
   325 Broadway, R/ARL
   Boulder, CO 80305

   Telephone: 303-497-7316
   Facsimile: 303-497-6546
   E-mail Address:

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) North Slope Alaska (NSA) Hourly Surface Meteorology, Flux, and
Radiation Data Set. This data set contains hourly data from two 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

This data set is also available on-line in 30-minute native format at under the link "CEOP EOP-1 Reference
Site Data Sets"

3.1 NSA Algorithms

This hourly data set was formed by extracting the top of the hour observations
from the native format data. The U and V wind components were computed from
wind speed and direction.

More information regarding this site can be found under the CEOP Reference
Site Station Characteristics link on the UCAR/JOSS CEOP Data Management page

More information on the ARM algorithms used to process the native format data
can be found at

3.2 Station Information

The following is a complete description of the station information provided
with this CEOP NSA data set. Table 1 details the station list parameters. NSA
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.        [NSA]
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. [Other:NSA]
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


3.3  Detailed Format Description
The CEOP EOP-1 NSA Hourly Surface Meteorology, Flux, and Radiation Data Set
contains 10 metadata parameters and 22 data parameters. The metadata
parameters describe the station location and time at which the data were
collected. 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 x details the data 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 
Station Pressure             Hectopascals (mb) 
Dry Bulb Temperature         Celsius 
Dew Point                    Celsius 
Relative Humidity            Percent
Specific Humidity            g/kg
Wind Speed                   m/s
Wind Direction               Degrees 
U Wind Component             m/s
V Wind Component             m/s
Total Precipitation          mm
Snow Depth                   cm     
Sensible Heat Flux           W/m2
Latent Heat Flux             W/m2
Incoming Shortwave Radiation W/m2
Outgoing Shortwave Radiation W/m2
Incoming Longwave Radiation  W/m2
Outgoing Longwave Radiation  W/m2
Net Radiation                W/m2
Skin Temperature             Celsius
CO2 Flux                     uMoles/m2/s
Incoming PAR                 uMoles/m2/s
Outgoing PAR                 uMoles/m2/s

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.

5.0  References