Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016GL072388 |
Active microwave observations of diurnal and seasonal variations of canopy water content across the humid African tropical forests | |
Konings, Alexandra G.1,2; Yu, Yifan2; Xu, Liang3; Yang, Yan3; Schimel, David S.3; Saatchi, Sassan S.2,3 | |
2017-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A higher frequency of severe droughts under warmer temperatures is expected to lead to large impacts on global water and carbon fluxes and on vegetation cover-including possible widespread mortality. Monitoring the hydraulic state of vegetation as represented by the canopy water content will allow rapid assessment of vegetation water stress. Here we show the potential of active microwave backscatter observations at Ku band for monitoring the diurnal and seasonal variations of top-of-canopy water content. We focus on the humid tropical forests of Central Africa and examine spatiotemporal variations of radar backscatter from QuikSCAT (2001-2009) and RapidScat (2014-2016). Diurnal variations in RapidScat backscatter demonstrate the occurrence of widespread midday stomatal closure in this region. Increases in backscatter during the dry seasons in humid forests could be explained by both dry season leaf flushing (as supported by canopy structure) and vapor pressure deficit-driven increases in evapotranspiration rates. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398183700028 |
WOS关键词 | AMAZON RAIN-FOREST ; STOMATAL CONDUCTANCE ; LAND-SURFACE ; SAP FLOW ; DRY SEASON ; STEM WATER ; BACKSCATTER OBSERVATIONS ; TERRESTRIAL ECOSYSTEMS ; DIAMETER VARIATIONS ; NORTHERN AUSTRALIA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/26601 |
专题 | 气候变化 |
作者单位 | 1.Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA; 2.CALTECH, NASA Jet Prop Lab, Pasadena, CA 91125 USA; 3.Univ Calif Los Angeles, Inst Environm & Sustainabil, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Konings, Alexandra G.,Yu, Yifan,Xu, Liang,et al. Active microwave observations of diurnal and seasonal variations of canopy water content across the humid African tropical forests[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(5). |
APA | Konings, Alexandra G.,Yu, Yifan,Xu, Liang,Yang, Yan,Schimel, David S.,&Saatchi, Sassan S..(2017).Active microwave observations of diurnal and seasonal variations of canopy water content across the humid African tropical forests.GEOPHYSICAL RESEARCH LETTERS,44(5). |
MLA | Konings, Alexandra G.,et al."Active microwave observations of diurnal and seasonal variations of canopy water content across the humid African tropical forests".GEOPHYSICAL RESEARCH LETTERS 44.5(2017). |
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