Title:	INDOEX: Maldives KCO Radiation Measurements (Valero)

Authors:

	Francisco P. J. Valero and Brett C. Bush
	Atmospheric Research Lab
	Scripps Institution of Oceanography
	University of California-San Diego
	Mail Code 0242
	9500 Gilman Dr.
	La Jolla, CA  92093
	Phone:	858-534-2701
	Fax:	858-822-0517
	fvalero@ucsd.edu
	bcbush@ucsd.edu

1.0 Data Set Overview:

This dataset contains measurements from the Radiation Measurement
System (RAMS), a multi-instrument array mounted at the Kaashidhoo Climate
Observatory during INDOEX.  Datafiles for each day of operation during
INDOEX are included (from 12Feb99 to 28Mar99).

2.0 Instrument description:

The RAMS consists of the following:

	Total Solar Broadband Radiometer (TSBR):  Hemispheric 
	field-of-view radiometer with a spectral bandpass from 
	0.2 to 3.9 microns.  The TSBR measured the downwelling
        total solar irradiance.  Accuracy = approx. 1%

	Direct Total Solar Broadband Radiometer (DTSBR):  Narrow
	field-of-view radiometer with a spectral bandpass from 
	0.2 to 3.9 microns.  The DTSBR measured the direct
        total solar irradiance.  Accuracy = approx. 1%

	Widebandpass Total Direct Diffuse Radiometer (WTDDR): Shadow
	band radiometer with a hemispheric field-of-view and 7 channels
	spanning the visible solar spectrum from the near-UV to the 
	near-IR: 500 nm channel (10 nm bandpass), and six 50 nm bandpass
	channels spanning 400-700 nm (center wavelengths: 425, 475, 525,
	575, 625, 675 nm).  The WTDDR instrument measured the downwelling
        solar flux in the given bandpasses.  (Note: Depending on the
        location of the shadow-band the measured flux could represent 
	the total, direct, or diffuse component of the downwelling solar 
	radiation. The data given in these files has been analyzed to
	separate these components).  Accuracy = approx. 3%

3.0 Data Collection and Processing:

The measurements were collected at a rate of 5 Hz. The TSBR and WTDDR
measurements have been corrected to account for slight variations in the
hemispherical field-of-view from the ideal cosine response.

The TSBR data is the global downwelling solar flux in Watts per meter squared.
The DTSBR data is the direct solar flux in Watts per meter squared.

A shadowband analysis of the WTDDR data has been completed resulting in
determination of the total, direct, and diffuse components of the downwelling
spectral fluxes. The time resolution of this data set is thus determined
by the period of the shadow band (approximately 1 minute). Note that the
"direct" term is the downwelling component of the spectral flux in the
line-of-sight to the Sun.


4.0 Data Format:

Data file structure: 	ASCII

        Broadband data: Three columns of UTC, TSBR, and DTSBR data
        WTDDR data:     Three sections of data (Total, Direct, and Diffuse)
                        each in 8 columns (UTC, 7 WTDDR channels)

File naming convention:	The TSBR and DTSBR data for each observation day have
                        been put into one file, while the WTDDR data for each
			day are in a separate file:

	Broadband data: indoex-kco.rams-bb.yyyymmdd.txt
	WTDDR data:    	indoex-kco.rams-tddr.yyyymmdd.txt

Header:			Header as determined by INDOEX guidelines

Data Version:		1.0 PRELIMINARY

Remarks:		Recommend contacting Francisco P. J. Valero or
			Brett C. Bush for assistance in using the data.


5.O References:

None