Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017
Surface solar radiation (<i>R<sub>s</sub></i>) 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...
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MDPI AG
2021-02-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/4/602 |
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| author | Fei Feng Kaicun Wang |
| author_facet | Fei Feng Kaicun Wang |
| author_sort | Fei Feng |
| collection | DOAJ |
| description | Surface solar radiation (<i>R<sub>s</sub></i>) 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 <i>R<sub>s</sub></i> data with high resolutions (3 h and 10 km). In this study, we compare three satellite <i>R<sub>s</sub></i> products based on AVHRR cloud products over China from 1983 to 2017 with direct observations of <i>R<sub>s</sub></i> and sunshine duration (SunDu)-derived <i>R<sub>s</sub></i>. The results show that SunDu-derived <i>R<sub>s</sub></i> have higher accuracy than the direct observed <i>R<sub>s</sub></i> at time scales of a month or longer by comparing with the satellite <i>R<sub>s</sub></i> products. SunDu-derived <i>R<sub>s</sub></i> is available from the 1960s at more than 2000 stations over China, which provides reliable decadal estimations of <i>R<sub>s</sub></i>. However, the three AVHRR-based satellite <i>R<sub>s</sub></i> products have significant biases in quantifying the trend of <i>R<sub>s</sub></i> from 1983 to 2016 (−4.28 W/m<sup>2</sup>/decade to 2.56 W/m<sup>2</sup>/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 <i>R<sub>s</sub></i> products, we propose a geographically weighted regression fusion method (HGWR) to merge ISCCP-HXG <i>R<sub>s</sub></i> with SunDu-derived <i>R<sub>s</sub></i>. The merged <i>R<sub>s</sub></i> 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 <i>R<sub>s</sub></i>. This study makes a first attempt to adjust the inhomogeneity of satellite <i>R<sub>s</sub></i> products and provides the merged high-resolution <i>R<sub>s</sub></i> product from 1983 to 2017 over China, which can be downloaded freely. |
| first_indexed | 2024-03-09T05:08:47Z |
| format | Article |
| id | doaj.art-271ef070bd6b4431ac43f6f3dda849d5 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T05:08:47Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-271ef070bd6b4431ac43f6f3dda849d52023-12-03T12:51:57ZengMDPI AGRemote Sensing2072-42922021-02-0113460210.3390/rs13040602Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017Fei Feng0Kaicun Wang1Research Center for Urban Forestry, College of Forestry, Beijing Forestry University, Beijing 100083, ChinaState Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, ChinaSurface solar radiation (<i>R<sub>s</sub></i>) 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 <i>R<sub>s</sub></i> data with high resolutions (3 h and 10 km). In this study, we compare three satellite <i>R<sub>s</sub></i> products based on AVHRR cloud products over China from 1983 to 2017 with direct observations of <i>R<sub>s</sub></i> and sunshine duration (SunDu)-derived <i>R<sub>s</sub></i>. The results show that SunDu-derived <i>R<sub>s</sub></i> have higher accuracy than the direct observed <i>R<sub>s</sub></i> at time scales of a month or longer by comparing with the satellite <i>R<sub>s</sub></i> products. SunDu-derived <i>R<sub>s</sub></i> is available from the 1960s at more than 2000 stations over China, which provides reliable decadal estimations of <i>R<sub>s</sub></i>. However, the three AVHRR-based satellite <i>R<sub>s</sub></i> products have significant biases in quantifying the trend of <i>R<sub>s</sub></i> from 1983 to 2016 (−4.28 W/m<sup>2</sup>/decade to 2.56 W/m<sup>2</sup>/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 <i>R<sub>s</sub></i> products, we propose a geographically weighted regression fusion method (HGWR) to merge ISCCP-HXG <i>R<sub>s</sub></i> with SunDu-derived <i>R<sub>s</sub></i>. The merged <i>R<sub>s</sub></i> 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 <i>R<sub>s</sub></i>. This study makes a first attempt to adjust the inhomogeneity of satellite <i>R<sub>s</sub></i> products and provides the merged high-resolution <i>R<sub>s</sub></i> product from 1983 to 2017 over China, which can be downloaded freely.https://www.mdpi.com/2072-4292/13/4/602surface solar radiationsunshine durationAVHRRdata fusion |
| spellingShingle | Fei Feng Kaicun Wang Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017 Remote Sensing surface solar radiation sunshine duration AVHRR data fusion |
| title | Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017 |
| title_full | Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017 |
| title_fullStr | Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017 |
| title_full_unstemmed | Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017 |
| title_short | Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017 |
| title_sort | merging high resolution satellite surface radiation data with meteorological sunshine duration observations over china from 1983 to 2017 |
| topic | surface solar radiation sunshine duration AVHRR data fusion |
| url | https://www.mdpi.com/2072-4292/13/4/602 |
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