Merging ground-based sunshine duration observations with satellite cloud and aerosol retrievals to produce high-resolution long-term surface solar radiation over China

Feng, Fei; Wang, Kaicun

Although great progress has been made in estimating surface solar radiation (inline-formulaRs) from meteorological observations, satellite retrieval, and reanalysis, getting best-estimated long-term variations in inline-formulaRs are sorely needed for climate studies. It has been shown that inline-formulaRs data derived from sunshine duration (SunDu) can provide reliable long-term variability, but such data are available at sparsely distributed weather stations. Here, we merge SunDu-derived inline-formulaRs with satellite-derived cloud fraction and aerosol optical depth (AOD) to generate high-spatial-resolution (0.1inline-formula) inline-formulaRs over China from 2000 to 2017. The geographically weighted regression (GWR) and ordinary least-squares regression (OLS) merging methods are compared, and GWR is found to perform better. Based on the SunDu-derived inline-formulaRs from 97 meteorological observation stations, which are co-located with those that direct inline-formulaRs measurement sites, the GWR incorporated with satellite cloud fraction and AOD data produces monthly inline-formulaRs with inline-formulaR2=0.97 and standard deviation inline-formula=11.14inline-formulaW m−2, while GWR driven by only cloud fraction produces similar results with inline-formulaR2=0.97 and standard deviation inline-formula=11.41inline-formulaW m−2. This similarity is because SunDu-derived inline-formulaRs has included the impact of aerosols. This finding can help to build long-term inline-formulaRs variations based on cloud data, such as Advanced Very High Resolution Radiometer (AVHRR) cloud retrievals, especially before 2000, when satellite AOD retrievals are not unavailable. The merged inline-formulaRs product at a spatial resolution of 0.1inline-formula in this study can be downloaded at https://doi.org/10.1594/PANGAEA.921847https://doi.org/10.1594/PANGAEA.921847 (Feng and Wang, 2020).

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Feng, Fei / Wang, Kaicun: Merging ground-based sunshine duration observations with satellite cloud and aerosol retrievals to produce high-resolution long-term surface solar radiation over China. 2021. Copernicus Publications.

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