A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau
Soil moisture is a key variable in the process of land−atmosphere energy and water exchange. Currently, there are a large number of operational satellite-derived soil moisture products and reanalysis soil moisture products available. However, due to the lack of in situ soil moisture measur...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-05-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/11/10/1196 |
| _version_ | 1819290743765729280 |
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| author | Meilin Cheng Lei Zhong Yaoming Ma Mijun Zou Nan Ge Xian Wang Yuanyuan Hu |
| author_facet | Meilin Cheng Lei Zhong Yaoming Ma Mijun Zou Nan Ge Xian Wang Yuanyuan Hu |
| author_sort | Meilin Cheng |
| collection | DOAJ |
| description | Soil moisture is a key variable in the process of land−atmosphere energy and water exchange. Currently, there are a large number of operational satellite-derived soil moisture products and reanalysis soil moisture products available. However, due to the lack of in situ soil moisture measurements over the Tibetan Plateau (TP), their accuracy and applicability are unclear. Based on the in situ measurements of the soil moisture observing networks established at Maqu, Naqu, Ali, and Shiquanhe (Sq) by the Institute of Tibetan Plateau Research, the Chinese Academy of Sciences, the Northwest Institute of Eco-Environmental Resources, the Chinese Academy of Sciences and the University of Twente over the TP, the accuracy and reliability of the European Space Agency Climate Change Initiative Soil Moisture version 4.4 (ESA CCI SM v4.4) soil moisture products and the European Centre for Medium-Range Weather Forecasts Reanalysis 5 (ERA5) soil moisture product were evaluated. The spatiotemporal distributions and interannual variations of the soil moisture were analyzed. Further, the climatological soil moisture changing trends across the TP were explored. The results show that with regard to the whole plateau, the combined product performs the best (unbiased root-mean-square error (ubRMSE) = 0.043 m<sup>3</sup>/m<sup>3</sup>, R = 0.66), followed by the active product (ubRMSE = 0.048 m<sup>3</sup>/m<sup>3</sup>, R = 0.62), the passive product (ubRMSE = 0.06 m<sup>3</sup>/m<sup>3</sup>, R = 0.61), and the ERA5 soil moisture product (ubRMSE = 0.067 m<sup>3</sup>/m<sup>3</sup>, R = 0.52). Considering the good spatiotemporal data continuity of the ERA5 soil moisture product, the ERA5 soil moisture data from 1979 to 2018 were used to analyze the climatological soil moisture changing trend for the entire TP surface. It was found that there was an increasing trend of soil moisture across the TP, which was consistent with the overall trends of increasing precipitation and decreasing evaporation. Moreover, the shrinkage of the cryosphere in conjunction with the background TP warming presumably contribute to soil moisture change. |
| first_indexed | 2024-12-24T03:27:36Z |
| format | Article |
| id | doaj.art-aa2221f9879c43bba16326fc5af74c80 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-24T03:27:36Z |
| publishDate | 2019-05-01 |
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| series | Remote Sensing |
| spelling | doaj.art-aa2221f9879c43bba16326fc5af74c802022-12-21T17:17:17ZengMDPI AGRemote Sensing2072-42922019-05-011110119610.3390/rs11101196rs11101196A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan PlateauMeilin Cheng0Lei Zhong1Yaoming Ma2Mijun Zou3Nan Ge4Xian Wang5Yuanyuan Hu6Laboratory for Atmospheric Observation and Climate Environment Research, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, ChinaLaboratory for Atmospheric Observation and Climate Environment Research, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, ChinaKey Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Science, Beijing 100101, ChinaLaboratory for Atmospheric Observation and Climate Environment Research, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, ChinaLaboratory for Atmospheric Observation and Climate Environment Research, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, ChinaLaboratory for Atmospheric Observation and Climate Environment Research, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, ChinaLaboratory for Atmospheric Observation and Climate Environment Research, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, ChinaSoil moisture is a key variable in the process of land−atmosphere energy and water exchange. Currently, there are a large number of operational satellite-derived soil moisture products and reanalysis soil moisture products available. However, due to the lack of in situ soil moisture measurements over the Tibetan Plateau (TP), their accuracy and applicability are unclear. Based on the in situ measurements of the soil moisture observing networks established at Maqu, Naqu, Ali, and Shiquanhe (Sq) by the Institute of Tibetan Plateau Research, the Chinese Academy of Sciences, the Northwest Institute of Eco-Environmental Resources, the Chinese Academy of Sciences and the University of Twente over the TP, the accuracy and reliability of the European Space Agency Climate Change Initiative Soil Moisture version 4.4 (ESA CCI SM v4.4) soil moisture products and the European Centre for Medium-Range Weather Forecasts Reanalysis 5 (ERA5) soil moisture product were evaluated. The spatiotemporal distributions and interannual variations of the soil moisture were analyzed. Further, the climatological soil moisture changing trends across the TP were explored. The results show that with regard to the whole plateau, the combined product performs the best (unbiased root-mean-square error (ubRMSE) = 0.043 m<sup>3</sup>/m<sup>3</sup>, R = 0.66), followed by the active product (ubRMSE = 0.048 m<sup>3</sup>/m<sup>3</sup>, R = 0.62), the passive product (ubRMSE = 0.06 m<sup>3</sup>/m<sup>3</sup>, R = 0.61), and the ERA5 soil moisture product (ubRMSE = 0.067 m<sup>3</sup>/m<sup>3</sup>, R = 0.52). Considering the good spatiotemporal data continuity of the ERA5 soil moisture product, the ERA5 soil moisture data from 1979 to 2018 were used to analyze the climatological soil moisture changing trend for the entire TP surface. It was found that there was an increasing trend of soil moisture across the TP, which was consistent with the overall trends of increasing precipitation and decreasing evaporation. Moreover, the shrinkage of the cryosphere in conjunction with the background TP warming presumably contribute to soil moisture change.https://www.mdpi.com/2072-4292/11/10/1196soil moistureESA CCI SMERA5Tibetan Plateau |
| spellingShingle | Meilin Cheng Lei Zhong Yaoming Ma Mijun Zou Nan Ge Xian Wang Yuanyuan Hu A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau Remote Sensing soil moisture ESA CCI SM ERA5 Tibetan Plateau |
| title | A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau |
| title_full | A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau |
| title_fullStr | A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau |
| title_full_unstemmed | A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau |
| title_short | A Study on the Assessment of Multi-Source Satellite Soil Moisture Products and Reanalysis Data for the Tibetan Plateau |
| title_sort | study on the assessment of multi source satellite soil moisture products and reanalysis data for the tibetan plateau |
| topic | soil moisture ESA CCI SM ERA5 Tibetan Plateau |
| url | https://www.mdpi.com/2072-4292/11/10/1196 |
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