A role for North Pacific salinity in stabilizing North Atlantic climate
A role for North Pacific salinity in stabilizing North Atlantic climate
复制标题
北太平洋盐度在稳定北大西洋气候中的作用
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Cook
中科院分区：
文献类型：
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作者：
L. Keigwin;M. Cook
[1]一个简单的海洋/大气反馈可能会减少在北大西洋周围的气候变率的幅度在间冰期相比，冰川状态。当北大西洋地区气候温暖时，热带辐合带的位置相对偏北，水汽从热带大西洋输出到热带太平洋。同时，东亚夏季风强，这有助于维持副极地北太平洋降水相对于蒸发的正平衡。这被认为是北太平洋相对于北大西洋盐度较低的原因，而这反过来又驱动了向北的水流通过白令海峡到达北大西洋的北方。北大西洋太平洋水的补充抑制了纬向翻转环流，减少了热通量。相反的情况在寒冷的气候中存在。因此，大气水汽输送和白令海峡气流的组合往往使北大西洋地区在温暖时变冷，在冷时变暖。
[1] A simple ocean/atmosphere feedback may reduce the amplitude of climate variability in around the North Atlantic during interglacial compared to glacial states. When climate is warm in the North Atlantic region, the Intertropical Convergence Zone has a relatively northward position, and moisture is exported from the tropical Atlantic to the tropical Pacific. At the same time the east Asian summer monsoon is strong, which helps maintain a positive balance of precipitation over evaporation in the subpolar North Pacific. This is thought to account for lower salinity in the North Pacific relative to the North Atlantic, which, in turn, drives northward flow through the Bering Strait to the northern North Atlantic. Freshening in the North Atlantic by water of Pacific origin suppresses the meridional overturning circulation and reduces the heat flux. The opposite situation exists during cold climate. Thus the combination of atmospheric vapor transport and flow through Bering Strait tends to cool the North Atlantic region when warm and warm the region when cool.