Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1029/2020WR027588 |
| Global Surface Soil Moisture Drydown Patterns | |
| Sehgal, Vinit; Gaur, Nandita; Mohanty, Binayak P. | |
| 通讯作者 | Mohanty, BP (corresponding author), Texas A&M Univ, Biol & Agr Engn, College Stn, TX 77843 USA. |
| 来源期刊 | WATER RESOURCES RESEARCH
 |
| ISSN | 0043-1397 |
| EISSN | 1944-7973 |
| 出版年 | 2021 |
| 卷号 | 57期号:1 |
| 英文摘要 | Understanding the global soil moisture (SM) dynamics and its governing controls beyond the Darcy Scale is critical for various hydrological, meteorological, agricultural, and environmental applications. In this study, we parameterize the pathways of global surface SM (theta(RS)) drydowns using seasonal observation from Soil Moisture Active Passive (SMAP) satellite (between 2015 and 2019) at 36 km resolution. We develop a new data-driven nonparametric approach to identify the canonical forms of theta(RS) drydown, followed by a nonlinear least squares parameterization of the seasonal drydown pathways at each SMAP footprint. The derived parameters provide the effective soil water retention parameters (SWRPeff), land-atmospheric coupling strength and soil hydrologic regimes for SMAP footprint. Depending on the footprint heterogeneity, climate, and season, the characteristics curves comprising different drydown phases are discovered at SMAP footprints. Drydown curves respond to the within-footprint changes in the meteorological drivers, land-surface characteristics, and the soil-vegetative and atmospheric dynamics. Drydown parameters display high interseasonal variability, especially in the grasslands, croplands, and savannah landscapes due to significant changes in the landscape characteristics and moisture patterns at the subgrid-scale. Soil texture exerts influence on the soil water retention and drydown parameters only when the footprint mean theta(RS) is low, specifically in arid and sparsely vegetated regions. The interseasonal variability of the SWRPeff is primarily driven by the landuse and climate of the SMAP footprint. A global understanding of the SM drydown features at SMAP footprint provides a significant step toward a scale-specific, effective soil hydrologic parameterization for various applications. |
| 类型 | Article |
| 语种 | 英语 |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000618001100031 |
| WOS关键词 | ENERGY-BALANCE ; LAND ; CLIMATE ; SMAP ; FRAMEWORK ; MODEL ; VALIDATION ; CHALLENGES ; EVOLUTION ; PRODUCTS |
| WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/369078 |
| 作者单位 | [Sehgal, Vinit] Texas A&M Univ, Water Management & Hydrol Sci, College Stn, TX USA; [Gaur, Nandita] Univ Georgia, Dept Crop & Soil Sci, Athens, GA 30602 USA; [Gaur, Nandita; Mohanty, Binayak P.] Texas A&M Univ, Biol & Agr Engn, College Stn, TX 77843 USA |
| 推荐引用方式 GB/T 7714 | Sehgal, Vinit,Gaur, Nandita,Mohanty, Binayak P.. Global Surface Soil Moisture Drydown Patterns[J],2021,57(1). |
| APA | Sehgal, Vinit,Gaur, Nandita,&Mohanty, Binayak P..(2021).Global Surface Soil Moisture Drydown Patterns.WATER RESOURCES RESEARCH,57(1). |
| MLA | Sehgal, Vinit,et al."Global Surface Soil Moisture Drydown Patterns".WATER RESOURCES RESEARCH 57.1(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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