A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products
Surface longwave radiation is sensitive to climate change on Earth. This study first comprehensively evaluates the accuracies of surface longwave upward radiation (SLUR) and surface longwave downward radiation (SLDR) among the mainstream surface longwave (LW) radiation products (GLASS, CERES SYN and...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/12/2955 |
| _version_ | 1797592870622855168 |
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| author | Qi Zeng Jie Cheng Mengfei Guo |
| author_facet | Qi Zeng Jie Cheng Mengfei Guo |
| author_sort | Qi Zeng |
| collection | DOAJ |
| description | Surface longwave radiation is sensitive to climate change on Earth. This study first comprehensively evaluates the accuracies of surface longwave upward radiation (SLUR) and surface longwave downward radiation (SLDR) among the mainstream surface longwave (LW) radiation products (GLASS, CERES SYN and ERA5); then, the global annual mean values of surface LW radiation as well as its temporal variations from 2003 to 2020 are quantified. The ERA5 SLUR and SLDR show the best accuracies by direct validation, with biases/Stds/RMSEs of −1.05/18.34/18.37 W/m<sup>2</sup> and −9.41/24.15/25.92 W/m<sup>2</sup>, respectively. The GLASS SLUR has the best accuracy under clear-sky conditions with a bias/Std/RMSE of −6.73/14.21/15.72 W/m<sup>2</sup>. The accuracy of the GLASS SLDR is comparable to CERES SYN. The merit of the GLASS LW radiation is that it can provide rich spatial details due to its high spatial resolution. The global annual mean SLUR is 399.77/398.92/398.19 W/m<sup>2</sup>, and that of the SLDR is 342.64/347.98/340.47 W/m<sup>2</sup> for GLASS, CERES SYN and ERA5, respectively. The interannual variation trends for the three products produce substantially growing long-term trends for the global mean SLUR and SDLR over the globe and land, while there are almost no trends over the ocean. The long-term trends of the seasonal mean SLUR and SDLR in the Northern and Southern Hemispheres are asymmetrical. Our comprehensive evaluation and trend analysis of the mainstream surface LW radiation products can aid in understanding the global energy balance and climate change. |
| first_indexed | 2024-03-11T01:59:17Z |
| format | Article |
| id | doaj.art-c76275fbe8f64f288cd199151bf883cf |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T01:59:17Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-c76275fbe8f64f288cd199151bf883cf2023-11-18T12:24:17ZengMDPI AGRemote Sensing2072-42922023-06-011512295510.3390/rs15122955A Comprehensive Evaluation of Three Global Surface Longwave Radiation ProductsQi Zeng0Jie Cheng1Mengfei Guo2State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Aerospace Information Research Institute of Chinese Academy of Sciences, Beijing 100875, ChinaState Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Aerospace Information Research Institute of Chinese Academy of Sciences, Beijing 100875, ChinaState Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Aerospace Information Research Institute of Chinese Academy of Sciences, Beijing 100875, ChinaSurface longwave radiation is sensitive to climate change on Earth. This study first comprehensively evaluates the accuracies of surface longwave upward radiation (SLUR) and surface longwave downward radiation (SLDR) among the mainstream surface longwave (LW) radiation products (GLASS, CERES SYN and ERA5); then, the global annual mean values of surface LW radiation as well as its temporal variations from 2003 to 2020 are quantified. The ERA5 SLUR and SLDR show the best accuracies by direct validation, with biases/Stds/RMSEs of −1.05/18.34/18.37 W/m<sup>2</sup> and −9.41/24.15/25.92 W/m<sup>2</sup>, respectively. The GLASS SLUR has the best accuracy under clear-sky conditions with a bias/Std/RMSE of −6.73/14.21/15.72 W/m<sup>2</sup>. The accuracy of the GLASS SLDR is comparable to CERES SYN. The merit of the GLASS LW radiation is that it can provide rich spatial details due to its high spatial resolution. The global annual mean SLUR is 399.77/398.92/398.19 W/m<sup>2</sup>, and that of the SLDR is 342.64/347.98/340.47 W/m<sup>2</sup> for GLASS, CERES SYN and ERA5, respectively. The interannual variation trends for the three products produce substantially growing long-term trends for the global mean SLUR and SDLR over the globe and land, while there are almost no trends over the ocean. The long-term trends of the seasonal mean SLUR and SDLR in the Northern and Southern Hemispheres are asymmetrical. Our comprehensive evaluation and trend analysis of the mainstream surface LW radiation products can aid in understanding the global energy balance and climate change.https://www.mdpi.com/2072-4292/15/12/2955surface radiation budgetsurface longwave upward radiation (SLUR)surface longwave downward radiation (SLDR)GLASSCERES SYNERA5 |
| spellingShingle | Qi Zeng Jie Cheng Mengfei Guo A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products Remote Sensing surface radiation budget surface longwave upward radiation (SLUR) surface longwave downward radiation (SLDR) GLASS CERES SYN ERA5 |
| title | A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products |
| title_full | A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products |
| title_fullStr | A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products |
| title_full_unstemmed | A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products |
| title_short | A Comprehensive Evaluation of Three Global Surface Longwave Radiation Products |
| title_sort | comprehensive evaluation of three global surface longwave radiation products |
| topic | surface radiation budget surface longwave upward radiation (SLUR) surface longwave downward radiation (SLDR) GLASS CERES SYN ERA5 |
| url | https://www.mdpi.com/2072-4292/15/12/2955 |
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