气候变化领域集成服务门户(CCPortal): Preferential Hydrologic States and Tipping Characteristics of Global Surface Soil Moisture

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DOI	10.1029/2023WR034858
	Preferential Hydrologic States and Tipping Characteristics of Global Surface Soil Moisture
	Sehgal, Vinit; Mohanty, Binayak P.
发表日期	2024
ISSN	0043-1397
EISSN	1944-7973
起始页码	60
结束页码	4
卷号	60 期号:4
英文摘要	A dynamic transition in soil hydrologic states through meteorological variability and terrestrial feedback governs soil-vegetation-climate (SVC) interactions, constrained by critical soil moisture (SM) thresholds. However, observational and scaling constraints limit critical SM threshold estimation at the remotesensing (RS) footprint scale. Using global surface SM (theta(RS)) from NASA's Soil Moisture Active Passive (SMAP) satellite, we characterize the seasonal preferential hydrologic states of theta(RS) and derive three tipping characteristics to estimate the intensity (Mean Tipping Depth, (epsilon) over bar), frequency (Tipping Count, eta), and duration (Mean Tipped Time, (tau) over bar) of the excursion of theta(RS) from wet- to dry-average conditions. The preferential state provides the seasonally dominant hydrological states of theta(RS), while tipping characteristics capture the ecosystem linkages of the dynamic transition in theta(RS) hydrologic states. Globally, theta(RS) predominantly exhibits a (unimodal) dry-preferential state, especially over arid/semi-arid drylands and a unimodal wet-preferential theta(RS) state in high-latitude boreal forests and tundra biomes. Prevalence of (bimodal) bistable theta(RS) state overlaps with regions of strong positive SM-precipitation coupling and monsoonal climate in semi-arid/subhumid climates. Seasonal preferential hydrologic states co-vary with the regional variability in plant water stress threshold and land-atmospheric coupling strength. Tipping characteristics of theta(RS) show sensitivity to intra-biome variability in SVC coexistence patterns and display high skill in partitioning global ecoregions. While e and. are climate-controlled, t is moderated by soil and vegetation through their influence over theta(RS) drydown during water-limited evapotranspiration. Preferential states and tipping characteristics find applications in quantifying SVC coexistence patterns, climate model diagnosis, and assessing ecosystem sensitivity to climate change.
英文关键词	SMAP; surface soil moisture; soil moisture preferential states; tipping characteristics; soil moisture drydowns; soil water retention parameters; soil moisture bimodality
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
WOS类目	Environmental Sciences ; Limnology ; Water Resources
WOS记录号	WOS:001192216200001
来源期刊	WATER RESOURCES RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303252
作者单位	Texas A&M University System; Texas A&M University College Station; Texas A&M University System; Texas A&M University College Station; Louisiana State University System; Louisiana State University
推荐引用方式 GB/T 7714	Sehgal, Vinit,Mohanty, Binayak P.. Preferential Hydrologic States and Tipping Characteristics of Global Surface Soil Moisture[J],2024,60(4).
APA	Sehgal, Vinit,&Mohanty, Binayak P..(2024).Preferential Hydrologic States and Tipping Characteristics of Global Surface Soil Moisture.WATER RESOURCES RESEARCH,60(4).
MLA	Sehgal, Vinit,et al."Preferential Hydrologic States and Tipping Characteristics of Global Surface Soil Moisture".WATER RESOURCES RESEARCH 60.4(2024).