Purpose:  The Central UV Calibration Facility held its fifth UV Spectroradiometer Intercomparison held June 14 - June 21, 2003 at the Table Mountain Test Facility, 8km North of Boulder, Colorado.  This directory contains the data from the intercomparison.  

Filename structure:
------------------

yyyy = year
jjj = Julian day
hhh = time * 10 in UTC
iii = instrument id
x = indicates the calibration source 
	1 = participants calibration  (e.g. h015)
	2 = participants calibration  (e.g. h024)
	3 = participants calibration  (e.g. h028)
	4 = cucf calibration (i.e. h025)
	5 = cucf calibration (i.e. h027)
	6 = cucf calibration (i.e. h030)
	Note: For ag2 and ep1, x = "n4" is the average of the three lamps.
	Note: For ag3 and ag4, x = "n1" is h027.

Original Solar data:
yyyyjjjhhhnx.iii - solar data for spectroradiometers 
yyyyjjjnx.iii - solar data for filter radiometers 
yyyyjjjR0x.iii - responsivity/calibration files
yyyyjjj_Ozone_nx.iii - total ozone
yyyyjjjErythema_nx.iii = Erythema
yyyjjj_erythema_nx.txt = Erythema from 290-360nm computed by KL

Convolved Solar data:
yyyyjjj_tri_nx.iii - solar spectroradimeter data convolved with 1-nm triangular function
yyyyjjj_gau_nx.iii - solar spectroradimeter data convolved with gaussian function
yyyyjjj_slaper_nx.iii - solar spectroradimeter data convolved using Slaper code 
yyyyjjjnx_iii.mmm - solar spectroradiometer data convolved with filter functions, where mmm = spectroradiometer, iii = filter instrument
yyyyjjjnx_iii.irr - filter solar data where specific filter measurement is extracted to match the time of that the scanning spectoradiometer scans the centroid of the filter, where iii = filter instrument

Plots:
yyyyjjj_unc_nx.ps	Original-Unconvolved spectoradiometer solar data
yyyyjjj_tri_nx.ps	Spectroradiometer solar data convolved with a 1-nm trianglular function
yyyyjjj_gau_nx.ps	Spectroradiometer solar data convolved with a gaussian function
yyyyjjj_slaper1.ps	Spectroradiometer solar data, wavelength corrected, convolved with 1-nm triangular function
timeyyyyjjj_tri_nx.ps	The 1-nm triangular data plotted for 4 wavelength bands as a function of solar zenith angle/time.

yyyyjjjnx_iiifilter.ps	Filter data and Spectroradiometer solar data convolved with filter functions of filter instrument iii (iii = sc1,sc2,sc3,ag3,ag4,ns2). 
timeyyyyjjj_iii_nxfilter.ps	The filter data and solar data convolved with filter functions for n filter wavelength as a function of solar zenith angle/time.

yyyyjjjOzone_nx.ps
yyyyjjj_Erythema_nxspec360.ps
yyyyjjj_Erythema_nxspec400.ps
yyyyjjj_Erythema_nxfilter.ps

Directory structure:
--------------------

Plots - all plots (filename format described above)
	Solar_spectroradiometer
	Solar_filter
	Erythema
	Ozone
Solar_participant - Blind comparison of solar data using participant's calibration.  
	Original - This is the original calibrated spectroradiometer data.  
	Convolved - This is the original calibrated data convolved using one of three methods described below (triangular, gaussian, slaper).
Solar_cucf - Solar data using cucf lamps and cucf field calibrator.
	Original - This is the original calibrated spectroradiometer data.  
	Convolved - This is the original calibrated data convolved using one of three methods described below (triangular, gaussian, slaper).
Filter_data
	Original - This is the original calibrated filter data.  
	Convolved - This is the original calibrated spectroadiometer data convolved with the filter functions of the filter instruments.
Responsivity - Responsivities generated using participants lamps and CUCF lamps.
Erythema - Erythemally weighted irradiance for spectroradiometers and filter radiometers 
	Erythema360 - Erythema from 290-360 nm 
	Erythema400 - Erythema from 290-400 nm (Each participant used their own method to extend from 360 to 400 nm.
	Filter - 
Ozone - Total ozone
Auxillary - auxillary information for participating UV instruments
Ancillary - ancillary data from ancillary instruments

Subdirectory structure:
-----------------------

Original - This is uncorrected calibrated data.  
Convolved - This is calibrated data corrected for differences in slit-functions and wavelength where indicated.
	Triangle - Data are convolved with a 1-nm trianglular function
	Gaussian - Uses a guassian function with a FWHM using the square-root of the squares of the sum of the other instrument's slit-functions (Jansson, 1994).
	Slaper - Uses Harry Slaper's code.  Data are corrected for wavelength.  Data are deconvolved using solar fraunhofer structure and reconvolved using 1-nm triangular function.

Participating Agencies:
-----------------------

ASRC	Atmospheric Science and Research Center at State University of New York (SUNY)
BSI		Biospherical Instruments
EPA		National UV Monitoring Center, EPA UV Monitoring Network
CMDL	Climate Monitoring and Diagnostic Laboratory of NOAA
NIWA	National Institute of Water and Atmospheric Research of New Zealand
NSF		National Science Foundation
SERC	Smithsonian Environmental Research Center 
IMUK	Institute of Meteorology and Climatology, University of Hanover, Germany 
USDA	Natural Resource and Ecology Laboratory (NREL) at Colorado State University, USDA UV Monitoring Network

Instrument_ids and labels:
--------------------------

ac1		ASRC_RSS	UV Rotating Shadowband Spectroradimeter 
ep1		EPA_BRW		Brewer Mark IV Spectroradmeter 
nw1		CMDL_NIWA	NIWA UV Spectroradiometer 
imk		IMUK_BEN	UV Bentham Spectroradiometer developed by IMUK
ns1		NSF_SUV		BSI SUV-150 UV Spectoradiometer
ns2		NSF_GUV		BSI GUV narrowband filter radiometer
sc1		SERC_UC		Smithsonian narrowband UV filter radiometer 
sc2		SERC_UZ		Smithsonian narrowband UV filter radiometer
sc3		SERC_UH		Smithsonian narrowband UV filter radiometer
ag1		USDA_RSS	YES UV Rotating Shadowband Spectroradiometer
ag2		USDA_U111	U111 UV Spectroradiometer developed by ASRC
ag3		USDA_MF1	YES UV-MFRSR Multi-Filter Rotating Shadowband Radiometer (#00232)
ag4		USDA_MF2	YES UV-MFRSR Multi-Filter Rotating Shadowband Radiometer (#00286)

Ancillary instruments:
----------------------

3 YES UVB1 broadband radiometers
3 SL501A broadband radiometers
1 Scintek broadband radiometer
1 YES TSI Total Sky Imager
Surfrad suite (Humidity, Temperature, YES UVB1, PSP, NIP, PIR, MFRSR) (www.srrb.noaa.gov)