A study of the air–sea interaction in the South Atlantic Convergence Zone through Granger causality
A study of the air–sea interaction in the South Atlantic Convergence Zone through Granger causality
复制标题
通过格兰杰因果关系研究南大西洋辐合带的海气相互作用
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Barreiro
中科院分区：
文献类型：
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作者：
G. Tirabassi;C. Masoller;M. Barreiro
利用格兰杰因果关系（GC）作为方向耦合的度量，研究了南大西洋辐合带（SACZ）海气相互作用。面积加权连通度的计算表明，SACZ区域是一个最大的相互海气连通在南大西洋海盆在夏季。通过对日耦合变率主导模态的分析，GC可以区分出四种不同耦合特征的区域：强迫主要由大气向海洋传递的年份、海洋强迫大气的年份、相互影响的年份和耦合不显著的年份。复合分析表明，海洋驱动的事件具有首先发展的大气异常，并且在海洋上最强，而在没有耦合的事件中，异常从大陆发展，在那里它们最强，并且具有较小的海洋延伸。
Air–sea interaction in the region of the South Atlantic Convergence Zone (SACZ) is studied using Granger causality (GC) as a measure of directional coupling. Calculation of the area weighted connectivity indicates that the SACZ region is the one with largest mutual air–sea connectivity in the south Atlantic basin during summertime. Focusing on the leading mode of daily coupled variability, GC allows distinguishing four regimes characterized by different coupling: there are years in which the forcing is mainly directed from the atmosphere to the ocean, years in which the ocean forces the atmosphere, years in which the influence is mutual and years in which the coupling is not significant. A composite analysis shows that ocean‐driven events have atmospheric anomalies that develop first and are strongest over the ocean, while in events without coupling anomalies develop from the continent where they are strongest and have smaller oceanic extension.