The production of ice and dense shelf water in the Okhotsk Sea polynyas
The production of ice and dense shelf water in the Okhotsk Sea polynyas
复制标题
鄂霍次克海冰间湖中冰和稠密陆架水的产生
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Kohji Yamashita
中科院分区：
文献类型：
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作者：
Seelye Martin;R. Drucker;Kohji Yamashita
本文研究了1990-1995年冬季鄂霍次克海沿岸冰穴的冰和浓水生产。主要的冰穴位于西北和北方陆架以及Shelikhov湾。我们使用的特殊传感器微波/成像仪（SSM/I）的算法来推导出每个冰间湖的面积和组成的薄冰和开放的水和热通量算法来推导出冰和盐水的生产。历史上的海洋学观测表明，西北陆架是北太平洋唯一一个σ_s = 26.8的潜在密度面露出海面的区域，也是鄂霍次克陆架中观测到淡水出现的部分。为了支持这些观察结果，我们发现西北陆架冰间湖是主要的冰和盐水生产者，平均约占总产量的55%。Shelikhov湾是第二大生产者，约占总量的25%;该地区以前被海洋学和遥感研究所忽视。使用两个稠密水生产模型的组合，我们发现，6年平均稠密水生产介于0.2-0.4 Sv。占主导地位的西北大陆架的冰和盐水产量每年变化3倍，而所有北方冰穴的产量每年变化2倍。西北大陆架的变化来源于这样一个事实，即海岸线的西南-东北趋势和冬季平均地转风速大致平行，这意味着风向的微小变化会导致冰产量的巨大变化。
This paper examines the ice and dense water production in the Okhotsk Sea coastal polynyas for the 1990–1995 winters. The dominant polynyas occur on the northwest and northern shelves and in Shelikhov Bay. We use an algorithm developed for the special sensor microwave/imager (SSM/I) to derive for each polynya the area and composition of thin ice and open water and a heat flux algorithm to derive the ice and brine production. Historic oceanographic observations show that the northwest shelf is the only North Pacific region where the σϑ = 26.8 potential density surface outcrops to the surface and is also that part of the Okhotsk shelf where the densest water is observed to occur. In support of these observations, we find that the northwest shelf polynya is the dominant ice and brine producer, contributing on average about 55% of the total production. Shelikhov Bay is the second largest producer with about 25% of the total; this region has been previously neglected by both oceanographic and remote sensing studies. Using a combination of two dense water production models, we find that the 6 year average dense water production lies between 0.2–0.4 Sv. The ice and brine production for the dominant northwest shelf vary interannually by a factor of 3, while the production from all the northern polynyas varies by factor of 2. The source of the variability for the northwest shelf comes from the fact that the southwest-to-northeast trend of the coastline and the mean winter geostrophic wind velocities are roughly parallel, which means that small variations in the wind direction yield large changes in the ice production.