The third Arctic climate pattern: 1930s and early 2000s
The third Arctic climate pattern: 1930s and early 2000s
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第三次北极气候模式：1930年代和2000年代初期
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Muyin Wang
中科院分区：
文献类型：
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作者：
J. Overland;Muyin Wang
与前几十年相比，在最近几年（2000-2005年）的冬季和春季，西伯利亚东部/东西伯利亚海和加拿大东北部/巴芬湾两个局部地区发生了持续的近地面暖温度异常。冬季阿留申低压的北移和加强以及冰岛低压的减弱是造成这场风暴的直接原因。春季表现出偶极子模式，北极北美一侧的海平面气压较高，欧亚大陆的气压较低。1951-2005年北极气候的相空间轨迹基于SLP的前两个EOF，北极涛动和太平洋北美型（PNA*）模式，显示出多年变率，导致SLP降低和20世纪最后几十年的温度升高。最近的冬天有一些投影到PNA*，但在最近的春天SLP偶极子并没有强烈的投影到两个基本的气候模式。1928-1935年的SLP也存在偶极结构，这对世纪上半叶的北极暖温年代际异常有贡献。认识到最近持续的和有点独特的北极气候模式是重要的，因为它有助于北极生态系统的持续重组。
Persistent near‐surface warm temperature anomalies have occurred in two localized areas, eastern Siberia/East Siberian Sea and northeastern Canada/Baffin Bay, during winter and spring in recent years (2000–2005) in contrast to previous decades. The proximate cause in winter was a northward displacement and strengthening of the Aleutian Low and a weakening of the Icelandic Low. Spring showed a dipole pattern with higher sea‐level pressure (SLP) on the North American side of the Arctic and lower pressures over Eurasia. Phase space trajectories of arctic climate for 1951–2005 based on the first two EOFs of SLP, the Arctic Oscillation and a Pacific North American‐like (PNA*) pattern, show multi‐annual variability leading to lower SLP and warmer temperatures in the last decades of the 20th century. Recent winters have some projection onto PNA*, but the SLP dipole in recent springs does not strongly project onto either of the two basic climate patterns. The period from 1928–1935 also had a dipole structure in SLP, which contributed to the interdecadal arctic‐wide warm temperature anomalies in the first half of the 20th century. Recognition of the recent persistent and somewhat unique Arctic climate pattern is important as it contributes to the ongoing reorganization of arctic ecosystems.