Decadal summer drought frequency in China: the increasing influence of the Atlantic Multi-decadal Oscillation
Decadal summer drought frequency in China: the increasing influence of the Atlantic Multi-decadal Oscillation
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DOI：
10.1088/1748-9326/9/12/124004
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发表时间：
2014-12
影响因子：
6.7
通讯作者：
C. Qian;Jin‐Yi Yu;Ge Chen
中科院分区：
文献类型：
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作者：
C. Qian;Jin‐Yi Yu;Ge Chen
研究了1956-2005年中国东部夏季干旱事件的年代际变化，以确定其主要变率模态及其与太平洋年代际涛动（PDO）、大西洋多年代际涛动（AMO）和全球变暖的关系。在20世纪60年代至90年代初，PDO通过调节西太平洋副热带高压和蒙古高压主导了中国干旱频率。20世纪90年代初后，PDO产生的四极干旱型减弱，取而代之的是AMO通过北大西洋至中国的欧亚波列产生的偶极干旱型。自20世纪90年代初以来，AMO对中国干旱的影响越来越大，这进一步表明是全球变暖的结果。这项研究表明，20世纪90年代初，大西洋开始对中国乃至亚洲大部分地区的气候产生更大的影响。
Decadal variations in summer drought events during 1956–2005 are examined over Eastern China to identify their leading variability modes and their linkages to the Pacific Decadal Oscillation (PDO), Atlantic Multi-decadal Oscillation (AMO), and global warming. The PDO influence is found to dominate China drought frequency from the 1960s to early 1990s via modulating the Western Pacific Subtropical High and the Mongolian High. The four-pole drought pattern produced by the PDO diminished after the early 1990s, being replaced by a dipolar drought pattern that is produced by the AMO via a Eurasian wave train emanating from North Atlantic to China. The increasing influence of the AMO on China drought since the early 1990s is further shown to be a consequence of global warming. This study indicates that the early 1990s is a time when the Atlantic began to exert a stronger influence on climate over China and even larger part of Asia.