GSTDTAP  > 资源环境科学
DOI10.1029/2020WR027588
Global Surface Soil Moisture Drydown Patterns
Vinit Sehgal; Nandita Gaur; Binayak P. Mohanty
2020-12-02
发表期刊Water Resources Research
出版年2020
英文摘要

Understanding the global soil moisture (SM) dynamics and its governing controls beyond the Darcy Scale is critical for various hydrologic, meteorological, agricultural, and environmental applications. In this study, we parameterize the pathways of the seasonal drydowns using global surface soil moisture (θRS) observation from SMAP satellite (between 2015 and 2019) at 36 km resolution. We develop a new data‐driven non‐parametric approach to identify the canonical forms of θRS 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 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 inter‐seasonal variability, especially in 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 θRS is low, specifically in arid and sparsely vegetated regions. The influence of soil texture on the inter‐seasonal variability of SWRPeff is low compared to landuse and climate at the RS‐footprint scale. The global understanding of SM drydown features at SMAP footprints provides a significant step towards a scale‐specific, effective soil hydrologic parameterization for various applications.

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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/305743
专题资源环境科学
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GB/T 7714
Vinit Sehgal,Nandita Gaur,Binayak P. Mohanty. Global Surface Soil Moisture Drydown Patterns[J]. Water Resources Research,2020.
APA Vinit Sehgal,Nandita Gaur,&Binayak P. Mohanty.(2020).Global Surface Soil Moisture Drydown Patterns.Water Resources Research.
MLA Vinit Sehgal,et al."Global Surface Soil Moisture Drydown Patterns".Water Resources Research (2020).
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