Clear-Sky Shortwave Downward Flux at the Earth's Surface: Ground-Based Data vs. Satellite-Based Data

[摘要] The radiative flux data and other meteorological data in the BSRN archive start from 1992, but the RadFlux data, the clear‐sky radiative fluxes at the BSRN sites derived through regression analyses of actually observed clear‐sky fluxes, did not come into existence until the early 2000s, and at first, they were limited to the 7 NOAA SURFRAD and 4 DOE ARM sites, a subset of the BSRN sites. Recently, the RadFlux algorithm was applied more extensively to the BSRN sites for the production of clear‐sky ground‐based fluxes. At the time of this writing, there are 7119 site-months of clear‐sky fluxes at 42 BSRN sites spanning the time from 1992 to late 2017. These data provide an unprecedented opportunity to validate the satellite based clear‐sky fluxes. In this paper, the GEWEX SRB GSW(V3.0) shortwave downward fluxes spanning 24.5 years from 1983‐07 to 2007‐12, the CERES SYN1deg(Ed4A) and EBAF(Ed4.0) shortwave fluxes spanning 2000‐03 to mid‐2017 are compared with their RadFlux counterparts on the hourly, 3‐hourly, daily and monthly time scales. All the three datasets show reasonable agreement with their ground‐based counterparts. Comparison of the satellite‐based surface shortwave clear‐sky radiative fluxes to the BSRN RadFlux analysis shows negative biases. Further analysis shows that the satellite‐based atmosphere contains greater aerosol optical paths as well as more precipitable water than RadFlux analysis estimates.

[发布日期] 2018-11-12

[学科分类] 大气科学

[关键词] METEOROLOGICAL PARAMETERS;REGRESSION ANALYSIS;ALGORITHMS;SPACE SURVEILLANCE (GROUND BASED);SATELLITE OBSERVATION;OPTICAL PATHS;NOAA 4 SATELLITE;ESTIMATES;BIAS