Deep-water circulation in the North Pacific deduced from Si-O diagrams
Deep-water circulation in the North Pacific deduced from Si-O diagrams
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从 Si-O 图推断北太平洋深水环流
DOI：
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发表时间：
1987
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影响因子：
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通讯作者：
S. Tsunogai
中科院分区：
文献类型：
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作者：
S. Tsunogai
本文应用一种简单的溶解硅（Si）和溶解氧（O）图解法研究了北太平洋深水环流，得到了以下结果和结论。在西太平洋向北流动的深海水中，硅的含量随着硅与氧的恒定比值（Si/O=-0.30）而增加。水被指定为主要序列。在东太平洋，Si-O图是该位置的特征，反映了与较老沃茨的混合程度以及由于生物物质分解而发生的变化。阿拉斯加湾被发现是北太平洋二氧化硅的重要来源，其底层水在40°N以北扩展到北太平洋中部，这里称为深海锋。阿留申海沟较年轻的深海水在40°N以北流入北太平洋东部时，不是通过46°N左右的皇帝海山差距，而是通过千岛-堪察加海沟北端流入。在包括白令海在内的北太平洋西部，当深水通过上升流到达其上边界时，由于活跃的等密混合和平流作用，深水几乎完全均匀化。因此，白令海的高生产力主要不是由富含营养物的深海水的直接供应造成的，也不是由达到500米以上深度的极其活跃的垂直混合造成的，而可能仅仅是由于白令海深层水团的上边界较浅，营养物很容易从那里输送到表面。
A simple dissolved silica (Si) and dissolved oxygen (O) diagram method was applied to study the deep-water circulation in the North Pacific and the following results and conclusion have been obtained. In the abyssal water flowing northward in the western Pacific Si increases with a constant ratio of Si to decreasing O(Si/O=−0.30). The water is designated as the main sequence. In the eastern Pacific the Si-O diagram is characteristic of the location and reflects the degrees of mixing with older waters and of alteration due to decomposition of biogenic material. The Bay of Alaska is found to be a great source of silica in the North Pacific and its bottom water spreads out to the central North Pacific north of 40°N, called here the abyssal front. The younger abyssal water in the Aleutian Trench flowing to the eastern North Pacific north of 40°N comes through the north end of the Kuril-Kamchatka Trench instead of the gap in the Emperor Seamounts at about 46°N. The deep water is almost completely homogenized by active isopycnal mixing and advection when the deep water reaches its upper boundary by upwelling in the western North Pacific including the Bering Sea. Thus the high productivity in the Bering Sea is principally caused neither by the direct supply of abyssal water rich in nutrients nor by the extremely active vertical mixing reaching depths greater than 500 m, but it may be caused simply by the shallower upper boundary of the deep water mass in the Bering Sea, from which nutrients are easily transported to the surface.