Seasonal variations of the Antarctic coastal ocean in
Seasonal variations of the Antarctic coastal ocean in
复制标题
南极沿岸海洋的季节变化
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
S. Ushio
中科院分区：
文献类型：
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作者：
K. Ohshima;T. Takizawa;S. Ushio
1990-1992年期间，在东南极洲Lutzow-Holm湾附近进行了全年海洋学观测。结果发现，冬季水（WW）层的厚度，其特点是冷的新鲜富氧水，表现出其最大值在南部的秋天（典型的500米）和其最小值在南部的夏天（典型的350-400米）。相关的密度变化的水柱解释只有大约三分之一的季节性变化的海平面在海岸，这表明一个大的季节性变化的正压海岸流。在秋季期间，WW层出现显著的清新。这似乎是由于WW的积累，其上部是新鲜的前一个夏天。这些季节性变化似乎每年都会发生。我们认为，WW层的季节变化主要是由沿海海洋风的季节变化引起的。秋季盛行偏东风增强，使沿岸海域WW的Ekman辐合增强，夏季则相反。
During the period of 1990–1992, year-round oceanographic observations were conducted in the vicinity of Lutzow-Holm Bay, East Antarctica. It was found that the thickness of the Winter Water (WW) layer, characterized by a cold fresh oxygen-rich water, exhibits its maximum in the austral fall (typically 500 m) and its minimum in the austral summer (typically 350–400 m). The associated density variation of the water column explains only about one third of the seasonal variations in sea level at the coast, which suggests a large seasonal variation in barotropic coastal flow. Prominent freshening occurs in the WW layer during fall. This appears to be caused by the accumulation of WW, whose upper portion is freshened in the preceding summer. These seasonal variations appear to occur every year. We propose that the seasonal variation in the WW layer is mainly caused by the seasonal variation in the wind over the coastal ocean. In fall the prevailing easterly wind intensifies, which increases the Ekman convergence of WW in the coastal ocean, while in summer the opposite occurs.