NOAA/ESRL/GML/GRAD Radiation Archive The atmospheric radiation archive is organized by station and contains values from GML's six current and past baseline observatories: 1. Barrow Observatory - Barrow, Alaska; Directory: BRW 2. Trinidad Head Observatory - Trinidad, California; Directory: THD 3. Mauna Loa Observatory - Hilo, Hawaii; Directory: MLO 4. Samoa Observatory - American Samoa; Directory: SMO 5. South Pole Observatory - Antarctica; Directory: SPO 6. Summit Observatory - Summit, Greenland; Directory: SUM and four BSRN sites: 1. Alert Observatory - Alert, Nunavut, Canada; Directory: ALT 2. Boulder Atmospheric Observatory - Erie, Colorado; Directory: BAO 3. Prospect Hill Site - Bermuda; Directory: BER 4. Kwajalein Site - Marshall Islands; Directory: KWAJ The files contain values for the following types of measurements, the terms in parenthesis are the column heads in the files: 1. Direct solar irradiance (DIRECT) 2. Diffuse sky solar irradiance (DIFFUSE or DIFFUSE2) 3. Downwelling total solar irradiance (D_GLOBAL) 4. Downward longwave irradiance (D_IR) 5. Upward solar irradiance (U_GLOBAL) 6. Upward longwave irradiance (U_IR) Look at http://www.esrl.noaa.gov/gmd/grad/starmeas.html for a description of measurements in the above list. Instrument information is located at http://www.esrl.noaa.gov/gmd/grad/instruments.html. Each file in the station directories contains one month of irradiance values. The files are named using the station abbreviation, year and month number. As an example, Barrow's June, 2010 file is named BRW_2010_06.DAT. Most sites do not have all six measurements, -999.00 indicates non-existing or missing values. The irradiance values are listed in watts/square-meter. The first five columns after the header lines represent the year, month, day, hour and minute, respectively, of the measurements. The date/times are recorded at the end of the interval. Prior to 1988, the interval is three minutes. Since 1998 the interval is one minute. The solar zenith angle is listed in the last column. Any publication or other public or private use of this values should acknowledge that is was acquired by and obtained from NOAA/ESRL/GML/GRAD, the GML-Radiation group. Inquires should be directed to: Laura Riihimaki NOAA GML G-RAD 325 Broadway Boulder, Colorado 80305 Telephone: (303) 497-5244 Internet: Laura.Riihimaki@noaa.gov AAA_README.TXT 11-NOV-2012