Surface Soil Moisture Drydown over the Tibetan Plateau from SMAP: Consistency with In Situ Observations, Spatial Patterns and Controls
文献类型：期刊论文
| 作者 | Dong, Shiyu1,2; Zhu, Zhongli2; Zhang, Jinsong2; Liu, Ziqi3; Wu, Qingxia2 |
| 刊名 | REMOTE SENSING
 |
| 出版日期 | 2026-03-06 |
| 卷号 | 18期号:5页码:814 |
| 关键词 | soil moisture in situ networks drydown timescale SMAP Tibetan plateau |
| DOI | 10.3390/rs18050814 |
| 产权排序 | 2 |
| 文献子类 | Article |
| 英文摘要 | Highlights What are the main findings? SMAP satellite products systematically yield shorter soil moisture drydown timescales () compared to in situ observations. tau The drydown timescale exhibits a distinct southeast-to-northwest gradient across the Tibetan Plateau, primarily driven by elevation, soil sand fraction, and vegetation. What are the implications of the main findings? Discrepancies between satellite and ground estimates highlight the critical impact of effective sensing depth and spatial representativeness on soil memory characterization. Accounting for sensing-depth limitations and representativeness is essential for unbiased satellite-based tau applications in drought diagnostics and land-atmosphere coupling.Highlights What are the main findings? SMAP satellite products systematically yield shorter soil moisture drydown timescales () compared to in situ observations. tau The drydown timescale exhibits a distinct southeast-to-northwest gradient across the Tibetan Plateau, primarily driven by elevation, soil sand fraction, and vegetation. What are the implications of the main findings? Discrepancies between satellite and ground estimates highlight the critical impact of effective sensing depth and spatial representativeness on soil memory characterization. Accounting for sensing-depth limitations and representativeness is essential for unbiased satellite-based tau applications in drought diagnostics and land-atmosphere coupling.Abstract Soil moisture (SM) mediates land-atmosphere water and energy exchanges and is therefore central to evapotranspiration, drought evolution, and hydroclimate extremes. The SM drydown timescale (tau), typically derived from exponential decay fits following rainfall or snowmelt rewetting, provides a compact measure of near-surface memory and drying rate. Despite the availability of microwave satellite SM products, their reliability for drydown characterization over the Tibetan Plateau remains uncertain, and systematic evaluations of drydown events and tau against in situ networks are still limited. Here, we integrate five Tibetan Plateau (TP) soil moisture sensor networks with SMAP to (i) assess consistency in drydown event detection and tau estimation across observation systems and (ii) map TP-wide tau patterns and identify dominant controls using SMAP (2016-2025). SMAP-derived tau is generally smaller than in situ tau, indicating a faster drying signal in the satellite product; this may be attributed to differences in effective sensing depth and spatial representativeness between satellite footprints and point measurements. TP SMAP tau exhibits a pronounced southeast-to-northwest decreasing gradient, with the shortest tau over the arid interior. Partial least squares regression identifies elevation, sand fraction, and vegetation conditions as primary drivers of spatial tau variability. This research provides observational constraints for understanding land-surface hydrological processes and land-atmosphere coupling in alpine regions. |
| URL标识 | 查看原文 |
| WOS关键词 | SATELLITE ; TERM |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology |
| 语种 | 英语 |
| WOS记录号 | WOS:001713936200001 |
| 出版者 | MDPI |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221312]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Zhu, Zhongli |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; 2.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Disaster Risk R, Beijing 100875, Peoples R China; 3.Chinese Acad Meteorol Sci, Beijing 100081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Shiyu,Zhu, Zhongli,Zhang, Jinsong,et al. Surface Soil Moisture Drydown over the Tibetan Plateau from SMAP: Consistency with In Situ Observations, Spatial Patterns and Controls[J]. REMOTE SENSING,2026,18(5):814. |
| APA | Dong, Shiyu,Zhu, Zhongli,Zhang, Jinsong,Liu, Ziqi,&Wu, Qingxia.(2026).Surface Soil Moisture Drydown over the Tibetan Plateau from SMAP: Consistency with In Situ Observations, Spatial Patterns and Controls.REMOTE SENSING,18(5),814. |
| MLA | Dong, Shiyu,et al."Surface Soil Moisture Drydown over the Tibetan Plateau from SMAP: Consistency with In Situ Observations, Spatial Patterns and Controls".REMOTE SENSING 18.5(2026):814. |
入库方式： OAI收割
来源：地理科学与资源研究所
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