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首页> 外文期刊>ICES Journal of Marine Science >On the effect of the North Atlantic Oscillation on temperature and salinity of the subpolar North Atlantic intermediate and deep waters
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On the effect of the North Atlantic Oscillation on temperature and salinity of the subpolar North Atlantic intermediate and deep waters

机译：关于北大西洋涛动对亚极北大西洋中深水区温度和盐度的影响

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摘要

The close relationship between the observed water mass properties and the winter North Atlantic Oscillation (NAO) index (1950-2000s; r~2 ≈ 0.65) implies that changes in the NAOrelated atmospheric forcing may account for up to two-thirds of thermohaline changes at the intermediate and deep levels in the subpolar North Atlantic on a decadal time-scale. Persistent NAO decline (amplification) results in increase (decrease) in temperature and salinity in the intermediate-deep water column. A general mechanism explaining the close link between the NAO and coherent decadal changes in the intermediate and deep-water temperature and salinity in the region is inferred from the observed changes in the regional circulation and water mass properties. Two factors dominate this link: (ⅰ) intensity of convection in the Labrador Sea controlling injection of relatively cold freshwater into the intermediate layer, and (ⅱ) zonal extension of the Subpolar Gyre that regulates the relative contribution of cold fresh subpolar water and warm saline subtropical water to the deep-water formation.
机译：观测到的水团性质与冬季北大西洋涛动指数（NAO）（1950-2000s； r〜2≈0.65）之间的密切关系表明，与NAO相关的大气强迫的变化可能占热盐变化的三分之二。年代际尺度上，北极亚极中层和深层。 NAO持续下降（放大）会导致中深水塔中温度和盐度的上升（下降）。从观察到的区域环流和水团性质的变化可以推断出解释NAO和该区域中深水温度和盐度的连贯年代际变化之间密切联系的一般机制。两个因素主导了这一联系：（ⅰ）拉布拉多海中的对流强度控制向中层注入相对较冷的淡水，以及（ⅱ）亚极涡流的纬向扩展，调节冷鲜亚极水和温盐水的相对贡献亚热带水向深水形成。

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