Lateral redistribution of heat and salt in the Nordic Seas
Lateral redistribution of heat and salt in the Nordic Seas
复制标题
北欧海域热量和盐分的横向重新分布
DOI：
10.1016/j.pocean.2021.102609
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发表时间：
2021
影响因子：
4.1
通讯作者：
Pickart, Robert S.
中科院分区：
文献类型：
--
作者：
Spall, Michael A.;Almansi, Mattia;Huang, Jie;Haine, Thomas W.N.;Pickart, Robert S.
的位置，时间和机制，热量和盐通过和北欧海域内进行了讨论。分析是基于一个区域性的，高分辨率的海冰-海洋耦合数值模式，气候水文数据集，和大气再分析。该模式和气候学在热损失、水团和平均地转流方面大致一致。模型领域被用来证明，占主导地位的交换盆地之间的出口温暖，咸的水从挪威海到格陵兰和冰岛海，平均气旋边界电流系统和涡通量发挥重要作用。在这两个模型和气候学，大约2/3的热量损失到大气中的北欧海被发现在平均气旋流和1/3发生在封闭的再循环内的每个盆地环流的内部，与挪威海有最大的热量损失。季节性循环主要由当地的海气热通量内的环流，而它主要是由横向平流的气旋边界电流，特别是在北方挪威和格陵兰海。东格陵兰大陆架的淡水通量与当地的风有关，在冬季，当风通常朝向西南时，淡水被平流输送到大陆架上，而在夏季，当风弱或朝向东北时，淡水被平流输送到格陵兰海，这导致冬季的盐化和夏季的清新。
The locations, times, and mechanisms by which heat and salt are transported through and within the Nordic Seas are discussed. The analysis is based on a regional, high resolution coupled sea ice-ocean numerical model, a climatological hydrographic data set, and atmospheric reanalysis. The model and climatology are broadly consistent in terms of heat loss, water masses, and mean geostrophic currents. The model fields are used to demonstrate that the dominant exchange between basins is an export of warm, salty water from the Norwegian Sea into the Greenland and Iceland Seas, with both the mean cyclonic boundary current system and eddy fluxes playing important roles. In both the model and the climatology, approximately 2/3 of the heat loss to the atmosphere over the Nordic Seas is found over the mean cyclonic flow and 1/3 takes place within the closed recirculations in the interior of each of the basin gyres, with the Norwegian Sea having the largest heat loss. The seasonal cycle is dominated by local air-sea heat flux within the gyres while it is dominated by lateral advection in the cyclonic boundary current, particularly in the northern Norwegian and Greenland Seas. The freshwater flux off the east Greenland shelf is correlated with the local winds such that in winter, when winds are generally towards the southwest, freshwater is advected onto the shelf and in summer, when winds are weak or towards the northeast, freshwater is advected into the Greenland Sea, which leads to salinification in winter and freshening in summer.
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