Midlatitude westerlies, atmospheric CO2, and climate change during the ice ages
Midlatitude westerlies, atmospheric CO2, and climate change during the ice ages
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DOI：
10.1029/2005pa001154
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
J. Toggweiler;J. Russell;S. Carson;S. Carson
中科院分区：
文献类型：
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作者：
J. Toggweiler;J. Russell;S. Carson;S. Carson
[1]一个理想化的大气环流模式是由海洋的深层环流和CO2系统构成的，它解释了冰川-间冰期CO2循环的一些更令人困惑的特征，包括大气CO2和南极温度之间的紧密相关性，南极温度在终止时超过CO2，以及海洋的δ 13 C最小值从北太平洋向南大洋的大西洋部分转移。这些变化发生在南部翻转环流的开和关状态之间的转换模式。我们假设，这些转变发生在自然界中，通过一个积极的反馈，涉及中纬度西风，大气的平均温度，和南部深水的翻转。寒冷的冰川气候似乎使西风带向赤道移动，这使得更多的呼吸二氧化碳在深海中积累。像现在这样温暖的气候使西风带向极地移动，将深海中的二氧化碳排出。
[1] An idealized general circulation model is constructed of the ocean's deep circulation and CO2 system that explains some of the more puzzling features of glacial-interglacial CO2 cycles, including the tight correlation between atmospheric CO2 and Antarctic temperatures, the lead of Antarctic temperatures over CO2 at terminations, and the shift of the ocean's δ13C minimum from the North Pacific to the Atlantic sector of the Southern Ocean. These changes occur in the model during transitions between on and off states of the southern overturning circulation. We hypothesize that these transitions occur in nature through a positive feedback that involves the midlatitude westerly winds, the mean temperature of the atmosphere, and the overturning of southern deep water. Cold glacial climates seem to have equatorward shifted westerlies, which allow more respired CO2 to accumulate in the deep ocean. Warm climates like the present have poleward shifted westerlies that flush respired CO2 out of the deep ocean.