GLACIAL TO INTERGLACIAL CHANGES IN OCEAN CHEMISTRY
GLACIAL TO INTERGLACIAL CHANGES IN OCEAN CHEMISTRY
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DOI：
10.1016/0079-6611(82)90007-6
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发表时间：
1982-01-01
影响因子：
4.1
通讯作者：
BROECKER, WS
中科院分区：
文献类型：
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作者：
BROECKER, WS
在这方面要指出的第一点是，冰川时期海洋表面的冷却不足以解释冰芯结果所显示的大气CO 2含量减少约100ppm的现象。CLIMAP（1976）对冰川时期海洋表面温度的重建给出的数值比现在低2.5℃。每冷却一度，表层海水的二氧化碳压力下降约13 × 10-6大气压。这种冷却本身将使二氧化碳压力降低33 × 10- 6个大气压。由冰川的增长引起的海洋盐度的0.9/ 0的增加将导致二氧化碳分压的增加，这将弥补大约三分之二的减少。因此，在海洋化学没有任何变化的情况下，大气中的二氧化碳含量将几乎保持不变。由于冰期和间冰期二氧化碳分压值持续了数千年，在寻找其他原因时，必须考虑到海洋和大气一定改变了其化学成分。海洋的碳含量大约是大气的60倍；因此，大气中的二氧化碳含量在这个时间尺度上受制于海洋的化学反应。在这种情况下，大气中二氧化碳含量变化的原因几乎可以肯定是海洋化学成分的变化。在这个
The first point to be made in this connection is that the cooling of the surface ocean during glacial time was not adequate to explain the decrease in atmospheric CO 2 content of about 100 ppm suggested by the ice core results. The CLIMAP (1976) reconstruction of surface ocean temperature during glacial time gives a value of 2.5 C cooler than today. The CO 2 pressure of surface ocean water falls about 13 x 10-6 atm per degree of cooling. By itself this cooling would bring about a 33 x 10--6 atmosphere reduction in the CO 2 pressure. The 0.9/oo increase in ocean salinity caused by the growth of glaciers would have produced an increase in CO 2 partial pressure which would have compensated for about two thirds of this decrease. Hence, in the absence of any change in ocean chemistry, the atmospheric CO 2 content would have remained nearly constant. Since the glacial and the interglacial CO 2 partial pressure values persisted for many thousands of years, in looking for other causes it must be taken into account that the ocean as well as the atmosphere must have changed its chemistry. The ocean contains about 60 times more carbon than the atmosphere; thus the atmospheric CO 2 content is on this time scale slave to the ocean's chemistry. This being the case the cause of the change in atmospheric CO 2 content almost certainly lies in a change in the ocean's chemistry. In this