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Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017.
- Source :
- Remote Sensing; 2/15/2021, Vol. 13 Issue 4, p602-602, 1p
- Publication Year :
- 2021
-
Abstract
- Surface solar radiation (R<subscript>s</subscript>) is essential to climate studies. Thanks to long-term records from the Advanced Very High-Resolution Radiometers (AVHRR), the recent release of International Satellite Cloud Climatology Project (ISCCP) HXG cloud products provide a promising opportunity for building long-term R<subscript>s</subscript> data with high resolutions (3 h and 10 km). In this study, we compare three satellite R<subscript>s</subscript> products based on AVHRR cloud products over China from 1983 to 2017 with direct observations of R<subscript>s</subscript> and sunshine duration (SunDu)-derived R<subscript>s</subscript>. The results show that SunDu-derived R<subscript>s</subscript> have higher accuracy than the direct observed R<subscript>s</subscript> at time scales of a month or longer by comparing with the satellite R<subscript>s</subscript> products. SunDu-derived R<subscript>s</subscript> is available from the 1960s at more than 2000 stations over China, which provides reliable decadal estimations of R<subscript>s</subscript>. However, the three AVHRR-based satellite R<subscript>s</subscript> products have significant biases in quantifying the trend of R<subscript>s</subscript> from 1983 to 2016 (−4.28 W/m<superscript>2</superscript>/decade to 2.56 W/m<superscript>2</superscript>/decade) due to inhomogeneity in satellite cloud products and the lack of information on atmospheric aerosol optical depth. To adjust the inhomogeneity of the satellite R<subscript>s</subscript> products, we propose a geographically weighted regression fusion method (HGWR) to merge ISCCP-HXG R<subscript>s</subscript> with SunDu-derived R<subscript>s</subscript>. The merged R<subscript>s</subscript> product over China from 1983 to 2017 with a spatial resolution of 10 km produces nearly the same trend as that of the SunDu-derived R<subscript>s</subscript>. This study makes a first attempt to adjust the inhomogeneity of satellite R<subscript>s</subscript> products and provides the merged high-resolution R<subscript>s</subscript> product from 1983 to 2017 over China, which can be downloaded freely. [ABSTRACT FROM AUTHOR]
- Subjects :
- SUNSHINE
ATMOSPHERIC aerosols
SOLAR surface
SOLAR radiation
RADIATION
CLIMATOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Volume :
- 13
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Remote Sensing
- Publication Type :
- Academic Journal
- Accession number :
- 149772242
- Full Text :
- https://doi.org/10.3390/rs13040602