On the Arctic climate paradox and the continuing role of atmospheric circulation in affecting sea ice conditions
On the Arctic climate paradox and the continuing role of atmospheric circulation in affecting sea ice conditions
复制标题
DOI：
10.1029/2006gl028269
复制
发表时间：
2007-02
影响因子：
5.2
通讯作者：
J. Maslanik;S. Drobot;C. Fowler;W. Emery;R. Barry
中科院分区：
文献类型：
--
作者：
J. Maslanik;S. Drobot;C. Fowler;W. Emery;R. Barry
1980年代末和1990年代初观测到的冰盖减少是由于当时北极涛动（AO）阶段的强烈正向。然而，尽管AO从那时起改变为更中性的条件，冰的范围和旧冰的比例继续减少。AO指数和冰损失之间的这种不匹配可以解释为三个主要海平面气压（SLP）模式的频率，产生SLP的整体变化，而不是存在一个单一的，连贯的物理模式SLP减少与AO的正模式。这三种模式在AO高峰期是同相的，但从那时起它们的频率就不同了，其中两种模式继续导致北极西部冰盖的减少。因此，区域大气环流仍然是最近冰盖减少的一个重要因素。
The reduction in ice cover observed in the late 1980s and early 1990s has been attributed to the strongly positive Arctic Oscillation (AO) phase during that time. However, despite a change in the AO to more neutral conditions since then, ice extent and the fraction of old ice have continued to decrease. This mismatch between the AO index and loss of ice can be explained by the frequency of three main sea level pressure (SLP) patterns that yield overall variability in SLP, rather than the presence of a single, coherent physical pattern of SLP reduction associated with the positive mode of the AO. These three patterns were in phase during the peak AO period but their frequency has varied differently since then, with two of the patterns continuing to contribute to reduced ice cover in the western Arctic. Hence, regional atmospheric circulation remains a significant factor in recent reductions in ice cover.