On the Role of Eddies and Surface Forcing in the Heat Transport and Overturning Circulation in Marginal Seas
On the Role of Eddies and Surface Forcing in the Heat Transport and Overturning Circulation in Marginal Seas
复制标题
涡流和表面强迫在边缘海热传输和翻转环流中的作用
DOI：
10.1175/2011jcli4130.1
复制
发表时间：
2011
影响因子：
4.9
通讯作者：
M. Spall
中科院分区：
文献类型：
--
作者：
M. Spall
利用高分辨率海洋环流模式和简单概念模式的结合，探讨了受风强迫和大气热损失影响的边缘海的热输送和翻转环流的决定因素。这项研究的动机是北大西洋和北欧海之间的交换，这是一个对海洋热盐环流至关重要的区域。结果表明，边缘海形成的中尺度涡旋对平均经向热输运和经向翻转环流起主要作用。海洋的热通量和大气的冷却之间的平衡是决定交换性质的主要因素，这是由非量纲数表征的。对经向热输送、翻转环流、对流水密度和输出水密度的一系列涡旋解析原始方程模型计算结果与概念模型在大范围参数空间内的预测结果比较好。尺度和模式结果表明，风的影响很小，平均交换主要是浮力强迫的。这些结果表明，为了在气候模式中恰当地表示北大西洋和北欧海之间以及北欧海和大气之间的平均交换，必须准确地解析或参数化涡旋通量。
The factors that determine the heat transport and overturning circulation in marginal seas subject to wind forcing and heat loss to the atmosphere are explored using a combination of a high-resolution ocean circulation model and a simple conceptual model. The study is motivated by the exchange between the subpolar North Atlantic Ocean and the Nordic Seas, a region that is of central importance to the oceanic thermohaline circulation. It is shown that mesoscale eddies formed in the marginal sea play a major role in determining the mean meridional heat transport and meridional overturning circulation across the sill. The balance between theoceaniceddyheatfluxandatmosphericcooling,ascharacterizedbyanondimensionalnumber,isshownto be the primary factor in determining the properties of the exchange. Results from a series of eddy-resolving primitive equation model calculations for the meridional heat transport, overturning circulation, density of convective waters, and density of exported waters compare well with predictions from the conceptual model over a wide range of parameter space. Scaling and model results indicate that wind effects are small and the mean exchange is primarily buoyancy forced. These results imply that one must accurately resolve or parameterize eddy fluxes in order to properly represent the mean exchange between the North Atlantic and the Nordic Seas, and thus between the Nordic Seas and the atmosphere, in climate models.