IHOPUDCUS10_README.txt

The Site 10 surface data were collected by P. D. Blanken and J. G. Alfieri of the University of Colorado, Department of Geography. While the data were collected and are presented here in a very similar manner to the NCAR PAM/Flux data collected at Sites 1-9, the following information is provided in order to aid the user in understanding this data set in relation to the other IHOP surface data sets. If further information is needed beyond what is presented here, please contact Peter Blanken at blanken@colorado.edu.

FIELDS

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DATE TIME	This information is provided in both local time (CDT) and GMT. The appropriate reference each data and time stamp is listed in the header rows of the file. Note that CDT is equal to GMT -5.

YEAR	Year the data was collected, 2002.

MONTH	Month the data was collected formatted as follows:
		5		May,
		6		June.

DAY	The day of the month the data was collected

JULIAN	The Julian Day, i.e. the day of the year, the data was collected.

TIME	The time according to the 24 hr clock the data was collected.  The time refers to the midpoint in the 30 minute block; for example, 191500 refers to the period from 190000 to 193000. The format is as follows:
		HHMMSS
		where 	HH is the hour,
			MM is the minute,
			SS is the second.

dDoY	The decimal day of the year. The whole number value is the day of year the data was collected and the decimal value indicates the time of day as a fraction of the day. For example, 151.8020 would be 19:15:00 on the 151st day of the year, May 31. Note this information is provided only in reference to GMT.

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DATA	In certain cases, such as P and Rpar, when a parameter was not specifically measured at Site 10, data from Site 3 was incorporated in this data set in order to maintain consistency with the other IHOP unified data sets. These added data are flagged in the header rows as being from Site 3; the data collected directly at Site 10 are also denoted. It should also be noted that Site 3 was chosen because it is the site nearest to Site 10 and is approximately 1.8 km from Site 10.

	Also, with the exception of the latent, sensible, and soil heat fluxes which have not been gap filled, all of the data are gap filled using the same proximal site approach that was used with Sites 1-9.

Rsw.in	The incident shortwave radiation (W/m^2). Data are taken from Site 3. For further information on this measurement see: http://www.atd.ucar.edu/rtf/projects/ihop_2002/isff/ .

Rlw.in	 The incident long wave radiation (W/m^2). Data are taken from Site 3. For further information on this measurement see: http://www.atd.ucar.edu/rtf/projects/ihop_2002/isff/ .

T	The actual air temperature (deg C). Data are derived from the data collected by the Campbell Scientific CSAT3 sonic anemometer positioned 3 m, agl.

P	The atmospheric pressure (mb).  Data are taken from Site 3. For further information on this measurement see: http://www.atd.ucar.edu/rtf/projects/ihop_2002/isff/ .

MR	The mixing ratio (g/Kg). Data are taken from Site 3. For further information on this measurement see: http://www.atd.ucar.edu/rtf/projects/ihop_2002/isff/ .

Spd.3m	The wind speed (m/s). Data are derived from data collected by the Campbell Scientific CSAT3 sonic anemometer positioned 3 m, agl and is equivalent to prop wind speed.

U.3m	The U wind component (m/s). Data are derived from data collected by the Campbell Scientific CSAT3 sonic anemometer positioned
 3 m, agl.

V.3m	The crosswind or V wind component (m/s). Data are derived from data collected by the Campbell Scientific CSAT3 sonic anemometer positioned 3 m, agl.
rainacc	The accumulated rainfall (mm). Data are derived from data collected by the Texas Electronics tipping bucket rain gauge mounted 1 m, agl.

rainr	The rate of rainfall (mm/s). Data are derived from data collected by the Texas Electronics tipping bucket rain gauge mounted 1 m, agl.

Rnet	The net radiation (W/m^2). Data are derived from data collected by the REBS Q7 net radiometer positioned 3 m, agl.

Rpar	The photosynthetic active radiation (mmols/s/m^2). Data are taken from Site 3. For further information on this measurement see: http://www.atd.ucar.edu/rtf/projects/ihop_2002/isff/ .

Tsfc	The surface temperature (deg C). Data are derived from data collected by the Everest Infrared Temperature Sensor positioned   
3 m, agl, and angled 45 degrees from vertical in order to achieve an area of view of approximately 1.75 m^2. The emissivity was set to 0.98, the maximum for the instrument.

LE	The latent heat flux (W/m^2). Data are derived from data both the Campbell Scientific CSAT3 sonic anemometer and the Campbell Scientific KH2O Krypton Hygrometer both positioned 3 m, agl. The data has been corrected via 2-D rotation followed by oxygen absorption and WPL corrections, as well as correction for the displacement from the sonic anemometer.

H	The sensible heat flux (W/m^2). Data are derived from data collected by the Campbell Scientific CSAT3 sonic anemometer position 3 m, agl. This data has been corrected via 2-D rotation as well as correction for heat storage in the underlying column of air.

G	The ground (soil) heat flux (W/m^2). Data are derived as the mean value of the data collected by a pair of REBS HFT3 heat flux plates placed 5 cm beneath the soil surface. The data has been corrected for heat storage by the overlaying layer of soil.

SM1	The volumetric soil moisture content for the uppermost 5 cm of soil (fraction). Data are derived from data collected by the Campbell Scientific CS615 TDR probe placed 5 cm below the soil surface.

SM2	The volumetric soil moisture content for the layer of soil 5 to 10 cm below the surface (fraction). Data are derived from data collected by the Campbell Scientific CS615 TDR probe placed 10 cm below the soil surface.

SM3	The volumetric soil moisture content for the layer of soil 10 to 15 cm below the surface (fraction). Data are derived from data collected by the Campbell Scientific CS615 TDR probe placed 15 cm below the soil surface.

Tsoil	The soil temperature (deg C). Data are derived from the data collected by the REBS STP soil temperature probe placed 2.5 cm below the soil surface.

Raw.in	The incident solar radiation (W/m^2). This data is derived from the data collected by an Eppley pyranometer positioned 3 m, agl.


ADDITIONAL INFORMATION

Bad Data	9999






JG Alfieri 5/25/03

 

