Atmospheric Control on the Thermohaline Circulation
Atmospheric Control on the Thermohaline Circulation
复制标题
大气对温盐环流的控制
DOI：
10.1175/2008jpo3897.1
复制
发表时间：
2009
影响因子：
3.5
通讯作者：
A. Czaja
中科院分区：
文献类型：
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作者：
A. Czaja
为了阐明大气和海洋过程在北大西洋而不是北太平洋建立活跃的海洋翻转环流中的作用，对观测到的北大西洋和太平洋盆地的大气环流和地表净淡水通量进行了比较。有人提出，北大西洋上空大气急流的更不稳定的经向位移有助于维持其亚极环流的高地面盐度。此外，海面净淡水通量的空间格局有利于较高的亚极地大西洋盐度，这是因为在北太平洋，将净降水和净蒸发分开的地理分界线位于时间平均涡旋分离的南侧，而在北大西洋，这两条线往往重合。用一个理想的双涡旋系统进行的数值实验证实，这些差异影响了亚极气旋的盐度收支。
Abstract In an attempt to elucidate the role of atmospheric and oceanic processes in setting a vigorous ocean overturning circulation in the North Atlantic but not in the North Pacific, a comparison of the observed atmospheric circulation and net surface freshwater fluxes over the North Atlantic and Pacific basins is conducted. It is proposed that the more erratic meridional displacements of the atmospheric jet stream over the North Atlantic sector is instrumental in maintaining high surface salinities in its subpolar gyre. In addition, it is suggested that the spatial pattern of the net freshwater flux at the sea surface favors higher subpolar Atlantic salinity, because the geographical line separating net precipitation from net evaporation is found well south of the time-mean gyre separation in the North Pacific, whereas the two lines tend to coincide in the North Atlantic. Numerical experiments with an idealized two-gyre system confirm that these differences impact the salinity budget of the subpolar g...