XDS: USDARAD
usdarad: US Department of Agriculture (USDA) Radiation Monitoring Data
General Data Description
The USDA UV-B Monitoring and Research Program is a program of the US Department of Agriculture’s Cooperative State Research, Education and Extension Service (CSREES). The program started in 1992, through a grant to Colorado State University, to provide information on the geographical distribution and temporal trends of UVB (ultraviolet -B) radiation in the United States.
The SGP ARM site is part of the program’s climatological network. All sites are instrumented with both UV and Visible MFRSR shadowband radiometers and broadband UV-B meters.
Measurement Description
sgpusdaradX1.00 (before 6/10/2002)
A single record will contain 37 variable-length, comma-delimited fields. A typical record is listed below.
The field order is as follows:
Units
---------------------------------- --------------
Head Identification Integer
USDA UVB Program Site Code State code followed by number.
Date and Time YY/MM/DD hh:mm:ss in UTC
Open total horizontal Watts/m^2 NOTES:
415nm total horizontal Watts/m^2 [1] All angles are reported
500nm total horizontal Watts/m^2 as degrees
610nm total horizontal Watts/m^2
665nm total horizontal Watts/m^2
862nm total horizontal Watts/m^2
940nm total horizontal Watts/m^2
Open diffuse horizontal Watts/m^2
415nm diffuse horizontal Watts/m^2
500nm diffuse horizontal Watts/m^2
610nm diffuse horizontal Watts/m^2
665nm diffuse horizontal Watts/m^2
862nm diffuse horizontal Watts/m^2
940nm diffuse horizontal Watts/m^2
Open direct normal Watts/m^2
415nm direct normal Watts/m^2
500nm direct normal Watts/m^2
610nm direct normal Watts/m^2
665nm direct normal Watts/m^2
862nm direct normal Watts/m^2
940nm direct normal Watts/m^2
humidity % Relative Humidity
temperature (see below) degrees C
Li-Cor 210SZ photometer Watts/m^2
* unused field
* unused field
Yankee UVB-1 (see below) Watts/m^2
Yankee UVB-1 dome temperature degrees C
Solar azimuth degrees
Solar elevation degrees
Solar zenith angle degrees
Declination degrees
Air mass
Relative solar distance
The initial passband on the MFRSR is unfiltered and thus serves as a broadband silicon pyranometer. The remaining passbands are constructed with DF-xxx series integrated photodiode-interference filter assemblies manufactured by EG&G Optoelectronics. These are FWHM 10nm passbands.
Temperature and humidity data are derived from a Vaisala model HMP 35A combination probe. Humidity (%RH) is read directly as signal/10 and temperature in degrees C is computed as (signal – 2895) * 0.090). The computation is based upon a custom circuit board employed by the program.
The downward-looking Li-Cor 210z signal is reported as Watts/meter-squared using the the manufacturer’s furnished instrument-specific calibration. As these instruments are downward looking and intended only as an indication of changed ground albedo, they are not recalibrated on a regular basis. The conversion from mv to Watts/meter-squared by the following relation: W/m^2 = 1000/(manufacturer_supplied__calibration_constant * 683)
The Yankee UVB-1 broadband measures global irradiance in the UV-B spectral range of 280-330 nm. The measurement technique employs a combination of colored glass optical filters to block the sun’s visible spectra and a UV-sensitive fluorescent phosphor to convert the UVB light to visible light. The converted light is then measured with a solid-state photo diode. Signal output is 0-5 volts DC, low Z. Meter output is multiplied by 0.001968 to create watts/m^2 output. This factor follows the manufacturer’s recommendation. No attempt has been made to verify this relationship. The dome temperature of the Yankee UVB-1 is computed as degrees C by the relationship (signal*0.0479) + 6.6).
sgpusdauvmfrsrX1.00 (before 6/10/2002)
Angular corrections for the UV-MFRSR solar channels have been made and calibration based upon a standard lamp has been applied. Solar calculations of general utility have been added to the end of each record for the convenience of the user. The format and units of each field within a single record is listed below.
A single record will contain 37 variable-length, comma-delimited fields. A typical record is listed below:
Units ---------------------------------- -------------- Head Identification Integer USDA UVB Program Site Code State code followed by number. Date and Time YYMMDD hh:mm:ss in UTC 300nm total horizontal Watts/meter-squared 305nm total horizontal Watts/meter-squared 311nm total horizontal Watts/meter-squared 317nm total horizontal Watts/meter-squared 325nm total horizontal Watts/meter-squared 332nm total horizontal Watts/meter-squared 368nm total horizontal Watts/meter-squared 300nm diffuse horizontal Watts/meter-squared 305nm diffuse horizontal Watts/meter-squared 311nm diffuse horizontal Watts/meter-squared 317nm diffuse horizontal Watts/meter-squared 325nm diffuse horizontal Watts/meter-squared 332nm diffuse horizontal Watts/meter-squared 368nm diffuse horizontal Watts/meter-squared 300nm direct normal Watts/meter-squared 305nm direct normal Watts/meter-squared 311nm direct normal Watts/meter-squared 317nm direct normal Watts/meter-squared 325nm direct normal Watts/meter-squared 332nm direct normal Watts/meter-squared 368nm direct normal Watts/meter-squared Unused Unused Unused Unused Unused Unused Unused Solar azimuth degrees Solar elevation degrees Solar zenith angle degrees Declination degrees Air mass Relative solar distance
The passbands on the UVMFRSR are constructed with DF-xxx series integrated photodiode-interference filter assemblies manufactured by EG&G Optoelectronics. These are FWHM 2 nm nominal passbands.
sgpusdauvmfrsrX1.00 and sgpusdaradX1.00 (beginning 6/10/2002)
See description of measurements at: USDA site
Data sample:
sgpusdaradX1.00: Site, SN,UYYY,UM,UD,Uh,Um,Us,LYYY,LM,LD,Lh,Lm,Ls, DoY, Unf(ToT),415(Tot),500(Tot),610(Tot),665(Tot),862(Tot),940(Tot),Unf(Dif), 415(Dif),500(Dif),610(Dif),665(Dif),862(Dif),940(Dif),Unf(Dir),415(Dir), 500(Dir),610(Dir),665(Dir),862(Dir),940(Dir), uvbb, Azi, Elev, Zen, Decl, Airmass, Soldist, Qc Code OK01, 220,2009,07,13,00,00,00,2009,07,12,18,00,00,193.75000,2.02E+02, 1.83E-02,1.18E-01,9.35E-02,4.39E-01,2.26E-01,6.13E-02,7.52E+01,1.46E-02, 7.32E-02,3.02E-02,1.63E-01,6.61E-02,1.64E-02,3.70E+02,1.07E-02,1.30E-01, 1.85E-01,8.09E-01,4.69E-01,1.31E-01,1.53E-02, 282.90, 20.00, 70.00, 21.8400, 2.9027, 1.017,dh1;dh2;dh7;c1; sgpusdauvmfrsrX1.00: Site, SN,UYYY,UM,UD,Uh,Um,Us,LYYY,LM,LD,Lh,Lm,Ls, DoY, 300(ToT),305(Tot), 311(Tot),317(Tot),325(Tot),332(Tot),368(Tot),300(Dif),305(Dif),311(Dif),317(Dif), 325(Dif),332(Dif),368(Dif),300(Dir),305(Dir),311(Dir),317(Dir),325(Dir), 332(Dir),368(Dir), uvaraw, Azi, Elev,Zen, Decl, Airmass, Soldist, Qc Code OK02, 387,2009,07,02,00,00,00,2009,07,01,18,00,00,182.75000,0.00E+00, 1.50E-03,1.58E-02,4.69E-02,9.76E-02,1.23E-01,2.05E-01,0.00E+00,1.43E-03, 1.45E-02,4.24E-02,8.57E-02,1.05E-01,1.51E-01,0.00E+00,1.94E-04,3.60E-03, 1.30E-02,3.43E-02,5.17E-02,1.56E-01,-9.99E+09, 284.22, 20.30, 69.70, 23.0400, 2.8627, 1.017, so;c1; sgpusdauvmfrsrX1.00 and sgpusdaradX1.00 (beginning 7/23/2009) On 07/23/2009, uvbb was removed from sgpusdaradX1.00 data and uvaraw was removed from sgpusdauvmfrsrX1.00.
sgpusdaradauxX1.00 and sgpusdauvmfrsrauxX1.00 (beginning 6/10/2002)
See description of measurements at: USDA site
Data Sample:
sgpusdaradauxX1.00: Site, SN,UYYY,UM,UD,Uh,Um,Us,LYYY,LM,LD,Lh,Lm,Ls, DoY, uvbb, Par, RH, T-air, refirad, Pres, uvbhT, TheadVis, UnfBias, 415Bias, 500Bias, 610Bias, 665Bias, 862Bias, 940Bias, Azi, Elev, Zen, Decl, Airmass, Soldist, Qc Code OK01, 220,2009,07,12,00,00,00,2009,07,11,18,00,00,192.75000,8.8703, 9998.0, 25.2, 38.0, 2.0,-9998.0, 45.639, 40.750, 233.000, 25.000, 84.000, 69.000, 102.000, 329.000, 124.000, 283.04, 20.06, 69.94, 21.9800, 2.8956, 1.017, dh1;dh2;dh7; sgpusdauvmfrsrauxX1.00: Site, SN,UYYY,UM,UD,Uh,Um,Us,LYYY,LM,LD,Lh,Lm,Ls, DoY, uvaraw, Par, RH, T-air, refirad, Pres, uvahT, TheadUV, 300Bias, 305Bias, 311Bias, 317Bias, 325Bias, 332Bias, 368Bias, Azi, Elev, Zen, Decl, Airmass, Soldist, Qc Code OK02, 387,2009,07,03,00,00,00,2009,07,02,18,00,00,183.75000,-9.99E+09, 638.5,-9998.0,-9998.0,-9998.0,-9998.0,-9998.000, 41.761, -1.000, 48.000, 365.000, 293.000, 480.000, 401.000, 276.000, 284.12, 20.30, 69.70, 22.9600, 2.8633, 1.017, so; sgpusdaradauxX1.00 and sgpusdauvmfrsrauxX1.00 (beginning 7/23/2009) On 07/23/2009, the sequence of variables were changed. Here are the new headers. sgpusdaradauxX1.00: Site, SN,UYYY,UM,UD,Uh,Um,Us,LYYY,LM,LD,Lh,Lm,Ls, DoY, uvbb, Par, RH, T-air, refirad, Pres, uvbhT, TheadVis, Azi, Elev, Zen, Decl, Airmass, Soldist, UnfBias, 415Bias, 500Bias, 610Bias, 665Bias, 862Bias, 940Bias, Qc Code OK01, 220,2009,09,04,06,00,00,2009,09,04,00,00,00,247.00000,0.00E+00,-9998.0000, 56.4000, 20.6100, 0.0000,-9998.0000, 45.4948, 37.9862, 349.210, -45.710, 135.710, 7.120, -1.000, 1.008, 0.0000, -0.0750, -1.0000, -2.0000, -3.0250, -4.0000, -4.0000, dh1;dh2;dh7; sgpusdauvmfrsrauxX1.00: Site, SN,UYYY,UM,UD,Uh,Um,Us,LYYY,LM,LD,Lh,Lm,Ls, DoY, uvaraw, Par, RH, T-air, refirad, Pres, uvahT, TheadUV, Azi, Elev, Zen, Decl, Airmass, Soldist, 300Bias, 305Bias, 311Bias, 317Bias, 325Bias, 332Bias, 368Bias, Qc Code OK02, 387,2009,07,23,06,00,00,2009,07,23,00,00,00,204.00000,-9.99E+09, 0.8381,-9998.0000,-9998.0000,-9998.0000,-9998.0000,-9998.0000, 41.8930, 349.480, -32.670, 122.670, 20.040, -1.000, 1.016, -3.0000, -2.0000, -16.1000, -0.9750, 5.3000, 2.0000, -0.2500, so;
Temporal Coverage
| Datastream | Start Date | End Date |
|---|---|---|
| sgpusdaradX1.00 | 02/17/1999 | |
| sgpusdaradauxX1.00 | 06/10/2002 | |
| sgpusdauvmfrsrX1.00 | 02/17/1999 | |
| sgpusdauvmfrsrauxX1.00 | 06/10/2002 |
Data are available in daily files at the ARM Data Center a few days after data collection.
Area Covered
The instruments are located at the SGP site at latitude 97.5, longitude 36.6, elevation 317 (m).
Datastream Inputs
Data have not been converted to netCDF.
Related Links
USDA UV-B Monitoring and Research Program
USDA Radiometers at SGP ACRF site (Oklahoma, Billings)
Contacts
ARM Data Center
Data Source
Institution
USDA UV-B Monitoring and Research Program
Processing History
Beginning on June 10, 2002, to minimize space and processing times the auxiliary data (e.g., humidity, air temperature, barometer, instrument temperatures, etc.) are now in a file separate from the UVMFRSR irradiance data.
Example Data
sgpusdaradX1.00 both before and after 6/10/2002
217,OK01,20021111 13:09:00,5.822985,0.015465,0.013223,0.005211,0.005687, 0.000000,0.000000,5.822985,0.015465,0.013223,0.005211,0.005687,0.000000, 0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000, 0.000000,111.889999,0.510000,89.489998,-17.459999,31.286600,0.990000,
217,OK01,010806 23:51:00,255.749588,0.287717,0.386357,0.329288,0.311042, 0.268259,0.026877,78.570587,0.204029,0.203404,0.125024,0.102836,0.058348, 0.005226,548.231628,0.261901,0.569240,0.636121,0.649618,0.654808,0.072275, 17.000000,38.160000,5.800000,-9998.000000,-9998.000000,0.208608,45.494800, 276.890015,18.850000,71.150002,16.459999,3.069800,1.014200
sgpusdaradauxX1.00
217,OK01,20021111 00:00:00,62.700001,12.690000,0.000000,-9998.000000, -9998.000000,37.447601,38.264065,1.000000,47.000000,-3.000000,-3.000000, -2.000000,-33.000000,-43.000000,253.800003,-7.270000,97.269997,-17.309999, -1.000000,0.990100,bt;
sgpusdauvmfrsrauxX1.00
303,OK02,20021111 00:00:00,-9998.000000,-9998.000000,-9998.000000,-9998.000000, -9998.000000,-9998.000000,41.937222,-3.000000,-1.000000,1.000000,2.000000, -4.000000,0.000000,0.000000,253.809998,-7.270000,97.269997,-17.309999, -1.000000,0.990100,
sgpusdauvmfrsrX1.00 – both before and after 6/10/2002
303,OK02,20021111 13:09:00,0.000000,0.000000,0.000026,0.000303,0.000000, 0.004131,0.008851,0.000000,0.000000,0.000026,0.000303,0.000000,0.004131, 0.008851,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000, -9998.000000,111.900002,0.510000,89.489998,-17.459999,31.203899,0.990000,so;co;
299,OK02,010806 00:51:00,0.000035,0.000077,0.000783,0.005853,0.019680,0.032361, 0.052470,0.000035,0.000077,0.000783,0.005811,0.019498,0.032947,0.053159, 0.000028,0.000077,0.000040,0.000387,0.001548,-0.000456,0.000048,-9998.000000, -9998.000000,-9998.000000,-9998.000000,-9998.000000,-98.000000,-9998.000000, 285.540009,7.300000,82.699997,16.730000,7.447700,1.014300
Acronyms
CSREES Cooperative State Research, Education and Extension Service MFRSR Multi-Filter Rotating Shadow-band Radiometer SGP Southern Great Plains USDA US Department of Agriculture UV-B Ultra-violet-B
Citable References
Bigelow, DS, JR Slusser, AF Beaubien, and JH Gibson. 1998. “The USDA Ultraviolet Radiation Monitoring Program.” Bulletin of the American Meteorological Society 79(4): 601-615, doi: 10.1175/1520-0477(1998)079<0601:tuurmp>2.0.co;2
Harrison, L, J Michalsky, and J Berndt. 1994. “Automated multifilter rotating shadow-band radiometer: an instrument for optical depth and radiation measurements.” Applied Optics 32(22): 5118, doi: 10.1364/ao.33.005118