CEOP/EOP-1 CAMP Mongolia Hourly Surface Meteorology, Flux, and Radiation Data Set 1.0 Contact Information 1.1 UCAR/JOSS Contact Steven F Williams Data Specialist UCAR/JOSS P.O. BOX 3000 Boulder, CO, USA, 80307-3000 Telephone: 303-497-8987 Facsimile: 303-497-8158 E-Mail Address: sfw@ucar.edu 1.2 CAMP Contact Ichirow kaihotsu Department of Natural Environmental Sciences, Sougoukagaku-bu, Hiroshima University 1-7-1 Higashi-hiroshima,Hiroshima,739-8521, Japan Telephone: +81-824-24-6497 Facsimile: +81-824-24-0758 E-mail Address: kaihotu@hiroshima-u.ac.jp 2.0 General Description This data set contains the Coordinated Enhanced Observing Period (CEOP) Enhanced Observing Period 1 (EOP-1) CEOP related Asian Monsoon Experiment (CAMP) Mongolia Hourly Surface Meteorology, Flux, and Radiation Data Set. This data set contains hourly data from four sites 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 3.1 CAMP Mongolia Algorithms The algorithms used to produce the CAMP Mongolia native format data are as follows. The equipment platform is "ground". The calibration is standard calibration of the model presented by the instrument maker. The Theory of measurements is shown in Table 3.1.1 below. The spatial coverage is point measurement. The type of data collected, range, units and source are shown in Table 3.1.2 below. Table 3.1.1 Theory of Measurements Wind speed: Propeller anemometer Wind direction: Wind vane Air pressure: Electric capacitance change Air temperature: Platinum resistance thermometer Humidity: Vechlated capacitance change Surface soil temperature: Infrared radiation Net radiation: Thermocuple Rainfall: Tipping basket Soil temperature: Platinum resistance thermometer Soil moisture: TDR Soil heat flux: Thermocuple Table 3.1.2 Type of Data Parameter/Variable | Range | Units | Source Description | | | -------------------+---------+--------+---------------------------- Wind speed |1.0 - 60 | m/s | WIND-MONITOR 05103-4 (Young) -------------------+---------+--------+---------------------------- Wind direction | 0 - 355 | deg | WIND-MONITOR 05103-4 (Young) -------------------+---------+--------+---------------------------- Humidity | 0 - 100 | % | 50Y(VAISALA) -------------------+---------+--------+---------------------------- Air temperature |-40 - 60 | degC | Pt1000 -------------------+---------+--------+---------------------------- Air pressure |600-1060 | hPa | ANALOG BAROMETER PTB101 | | | (Campbell; VAISALA) -------------------+---------+--------+---------------------------- IRT |55-99.9 | degC | 4000.4G (EVEREST) -------------------+---------+--------+---------------------------- Rn |0.25 - 60| W/m2 | NET RADIOMETER Q7(REBS) -------------------+---------+--------+---------------------------- Rainfall | 0.2 | mm | RAIN COLLECTOR II(Davis) -------------------+---------+--------+---------------------------- Soil temperature |-40 - 60 | degC | Pt1000 -------------------+---------+--------+---------------------------- Soil moisture | 0 - 95 | % | Trime IT (IMKO) -------------------+---------+--------+---------------------------- Soil heat flux | - | W/m2 | HEAT FLOW TRANSDUCER HFT-1.1 (REBS) These data are also available on-line in 30-minute native format at http://www.joss.ucar.edu/ghp/ceopdm/ under the link "CEOP EOP-1 Reference Site Data Sets". This hourly data set was formed by extracting the top of the hour observations from the 30 minute native format data. The data were provided in Mongolian Standard Time in the Winter (MSTW) and were converted to UTC time by subtracting 8 hours from the MSTW. There were two wind speed values provided in the raw native format (WS1 and WS2). The first (WS1) wind speed values are provided in the output. The U and V wind components were computed from wind speed (WS1) and direction. The dew point was computed from the temperature and relative humidity (Bolton, 1980). Specific Humidity values were computed from the calculated dew point and station pressure using formulas from Wexler and Wildhack (1963). The hourly precipitation was formed by summing the previous bottom of the hour and current top of the hour 30 minute values. More information regarding this site can be found under the "CEOP Reference Site Station Characteristics" link on the UCAR/JOSS CEOP Data Management page at http://www.joss.ucar.edu/ghp/ceopdm/ . 3.2 Station Information The following is a complete description of the station information provided with this CEOP CAMP Mongolia data set. Table 1 details the station list parameters. 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. CEOP CAMP Mongolia station information is provided in a separate file along with the data. Note that the station information file contains information for both Automated Weather System (AWS) and Automatic Station for Soil Hydrology (ASSH) stations. This data set contains data from only the AWS stations. Table 1 Parameter Description --------- ----------- Identification ID in data. Identification Type Internal ID number type. Latitude Station Latitude. Longitude Station Longitude. Occurrence Station occurrence. Lat/Lon Accuracy Number of digits accuracy in lat/lon values. Name Expanded station name. Commissioned Flag `(C)' indicates commissioned station, `(N)' indicates station which is NOT commissioned. Begin Period of Coverage Beginning date of period of coverage (YYYYMMDD). End Period of Coverage End date of period of coverage (YYYYMMDD). Country Country in which station is located. State State code. County County code. UTC offset Hour Offset from UTC time. DST switch 'y' indicates station does switch to Daylight Savings Time (DST). 'n' indicates station does not switch to DST. Platform type Collection Platform. See Table 2. Reporting Frequency Frequency of data collection. Elevation Station elevation. Fixed/Mobile flag Flag indicating if station has fixed location. 'f' indicates a fixed station. 'm' indicates a mobile station. Table 2 Platform Type Description ------------- ----------- 264 CEOP Reference Site Platform Table 3 Reporting Frequency ------------------- hourly 3.3 Detailed Format Description The CEOP EOP-1 CAMP Mongolia 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 details the data parameters in each record. 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 http://www.joss.ucar.edu/ghp/ceopdm/ under the link CEOP EOP-1 Reference Site Data Sets. This data set contains data from the following Mongolian AWS sites only: Mandalgobi (MGS/130), Deren (DRS/230), Delgertsogt (DGS/330), and Bayantsagaan (BTS/430). 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 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. Wexler, A., and W. A. Wildhack, 1963: Humidity and Moisture. Vol. 3: Fundamentals and Standards. Reinhold Publ. Corp., 562 pp.