Comparison of Spectral and Broadband Measurements of Surface Flux with Model Calculations on Clear Days at the ARM SGP Site
Arking, A. (a), Liu, F. (a), Harrison, L. C. (b), Pilewskie, P. (c), and Chou, M.-D. (d), Johns Hopkins University (a), State University of New York, Albany (b), NASA Ames Research Center (c), NASA Goddard Space Flight Center (d)
Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting
Observations of spectral and broadband solar irradiance at the ARM/SGP site have been compared with line-by-line model calculations. The spectral measurements were made with the SUNY Albany Rotating Shadowband Spectroradiometer (RSS) and the NASA Ames Solar Spectral Flux Radiometer (SSFR). The broadband measurements were made with the Baseline Solar Radiation Network (BSRN) and the Solar and Infrared Observation Station (SIROS). Input to the model includes aerosol optical thickness and Angstrom coefficient based on Multi-Filter Rotating Shadowband Radiometer (MFRSR) measurements, and WV based on the 31 GHz Microwave Radiometer. The aerosols are assumed to be non-absorbing, as indicated by an analysis of the broadband measurements. Comparison of the LBL model calculations with the spectral measurements show they are in substantial agreement. Comparison of broadband measurements with broadband calculations for the same times, shows a discrepancy---similar to what has been observed in earlier investigations---which is mostly independent of any of the known parameters. We conclude that there is an inconsistency between broadband and spectral measurements that needs to be further examined.
Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).
