Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aa6965 |
Satellite-observed changes in vegetation sensitivities to surface soil moisture and total water storage variations since the 2011 Texas drought | |
Geruo, A.1; Velicogna, Isabella1,2; Kimball, John S.3; Du, Jinyang3; Kim, Youngwook3; Njoku, Eni2 | |
2017-05-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2017 |
卷号 | 12期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We combine soil moisture (SM) data from AMSR-E and AMSR-2, and changes in terrestrial water storage (TWS) from time-variable gravity data from GRACE to delineate and characterize the evolution of drought and its impact on vegetation growth. GRACE-derived TWS provides spatially continuous observations of changes in overall water supply and regional drought extent, persistence and severity, while satellite-derived SM provides enhanced delineation of shallow-depth soil water supply. Together these data provide complementary metrics quantifying available plant water supply. We use these data to investigate the supply changes from water components at different depths in relation to satellite-based enhanced vegetation index (EVI) and gross primary productivity (GPP) from MODIS and solar-induced fluorescence (SIF) from GOME-2, during and following major drought events observed in the state of Texas, USA and its surrounding semiarid area for the past decade. We find that in normal years the spatial pattern of the vegetation-moisture relationship follows the gradient in mean annual precipitation. However since the 2011 hydrological drought, vegetation growth shows enhanced sensitivity to surface SM variations in the grassland area located in central Texas, implying that the grassland, although susceptible to drought, has the capacity for a speedy recovery. Vegetation dependency on TWS weakens in the shrub-dominated west and strengthens in the grassland and forest area spanning from central to eastern Texas, consistent with changes in water supply pattern. We find that in normal years GRACE TWS shows strong coupling and similar characteristic time scale to surface SM, while in drier years GRACE TWS manifests stronger persistence, implying longer recovery time and prolonged water supply constraint on vegetation growth. The synergistic combination of GRACE TWS and surface SM, along with remote-sensing vegetation observations provides new insights into drought impact on vegetation-moisture relationship, and unique information regarding vegetation resilience and the recovery of hydrological drought. |
英文关键词 | drought terrestrial water storage soil moisture remote sensing solar-induced fluorescence vegetation-moisture sensitivity |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400902100001 |
WOS关键词 | NET PRIMARY PRODUCTION ; GROUNDWATER DEPLETION ; VARIABILITY ; PRODUCTIVITY ; INDICATORS ; MORTALITY ; PLANTS ; BIOMES |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32124 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA; 2.CALTECH, Jet Prop Lab, Pasadena, CA USA; 3.Univ Montana, Coll Forestry & Conservat, Numer Terradynam Simulat Grp, Missoula, MT 59812 USA |
推荐引用方式 GB/T 7714 | Geruo, A.,Velicogna, Isabella,Kimball, John S.,et al. Satellite-observed changes in vegetation sensitivities to surface soil moisture and total water storage variations since the 2011 Texas drought[J]. ENVIRONMENTAL RESEARCH LETTERS,2017,12(5). |
APA | Geruo, A.,Velicogna, Isabella,Kimball, John S.,Du, Jinyang,Kim, Youngwook,&Njoku, Eni.(2017).Satellite-observed changes in vegetation sensitivities to surface soil moisture and total water storage variations since the 2011 Texas drought.ENVIRONMENTAL RESEARCH LETTERS,12(5). |
MLA | Geruo, A.,et al."Satellite-observed changes in vegetation sensitivities to surface soil moisture and total water storage variations since the 2011 Texas drought".ENVIRONMENTAL RESEARCH LETTERS 12.5(2017). |
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