Terrestrial water storage anomalies of Yangtze River Basin droughts observed by GRACE and connections with ENSO
Terrestrial water storage anomalies of Yangtze River Basin droughts observed by GRACE and connections with ENSO
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DOI：
10.1016/j.gloplacha.2015.01.002
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发表时间：
2015-03
影响因子：
3.9
通讯作者：
Zizhan Zhang;B. Chao;Jianli Chen;C. Wilson
中科院分区：
文献类型：
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作者：
Zizhan Zhang;B. Chao;Jianli Chen;C. Wilson
2006年夏和2011年春，中国长江流域发生了两次特大旱灾。我们使用来自GRACE卫星飞行任务的时变重力数据，结合TRMM卫星和Situriver测量仪的观测，以及GLDAS和WGHM水文模型，研究了这些事件在YRB的陆地水储量(TWS)的变化。GRACE TWS赤字估计清楚地量化了这些YRB干旱，而基于GRACE的归一化TWS异常为YRB提供了一个替代的和有用的水文气候指标。研究发现，厄尔尼诺(La Niña)事件与YRB的高(低)TWS显著相关，位相提前约7-8个月，且YRB下部对ENSO变化比上部盆地更敏感。从影响YRB降水的物理机制出发，提出了TWS异常与ENSO的可能联系。
Two severe drought events occurred in the Yangtze River Basin (YRB) of China in the summer of 2006 and the spring of 2011. We examine terrestrial water storage (TWS) changes in the YRB for these events using time-variable gravity data from the GRACE satellite mission, in combination with observations made by TRMM satellite andin situriver gauges, along with hydrological models GLDAS and WGHM. GRACE TWS deficit estimates clearly quantify these YRB droughts, and a normalized GRACE-based TWS anomaly provides an alternative and useful hydro-climatological index in the YRB. We find that an El Niño (La Niña) event is significantly correlated with high (low) TWS in the YRB with a phase lead of ~ 7–8 months, and the lower YRB is more sensitive to ENSO variability than the upper basin. The possible linkage between TWS anomaly and ENSO is raised in terms of physical mechanisms of influencing the precipitation over the YRB.