TRMM‐TMI satellite observed soil moisture and vegetation density (1998–2005) show strong connection with El Niño in eastern Australia
TRMM‐TMI satellite observed soil moisture and vegetation density (1998–2005) show strong connection with El Niño in eastern Australia
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DOI：
10.1029/2007gl030311
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
Yi Y. Liu;R. de Jeu;A. van Dijk;M. Owe
中科院分区：
文献类型：
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作者：
Yi Y. Liu;R. de Jeu;A. van Dijk;M. Owe
利用TRMM/TMI被动微波观测，研究了1998年至2005年澳大利亚大陆土壤湿度和植被含水量的时空格局。经验正交函数技术用于提取主要的空间和时间模式，用于反演土壤顶部1 cm的含水量（θ）和植被含水量（通过光学深度τ）。主要的时间θ和τ模式在春季与厄尔尼诺南方涛动指数（SOI）有很强的相关性（r2 = 0.90），秋季，夏季和冬季的相关程度逐渐降低。印度洋偶极子指数也解释了春季θ和τ的部分变化。相关分析表明，受厄尔尼诺影响最严重的地区主要位于澳大利亚东部。结果表明，自2000年以来澳大利亚东部经历的干旱状况与厄尔尼诺现象有着密切的联系，这些卫星观测结果清楚地表明了这一点。
Spatiotemporal patterns in soil moisture and vegetation water content across mainland Australia were investigated from 1998 through 2005, using TRMM/TMI passive microwave observations. The Empirical Orthogonal Function technique was used to extract dominant spatial and temporal patterns in retrieved estimates of moisture content for the top 1‐cm of soil (θ) and vegetation moisture content (via optical depth τ). The dominant temporal θ and τ patterns were strongly correlated to the El Niño Southern Oscillation Index (SOI) in spring (r2 = 0.90), and to a progressively lesser extent autumn, summer and winter. The Indian Ocean Dipole (IOD) index also explained part of the variation in spring θ and τ. Correlation analysis suggested that the regions most affected by El Niño are mainly located in eastern Australia. The results suggest that the drought conditions experienced in eastern Australia since 2000 and clearly expressed in these satellite observations have a strong connection with El Niño.