Vertical Heat Transport by Ocean Circulation and the Role of Mechanical and Haline Forcing
Vertical Heat Transport by Ocean Circulation and the Role of Mechanical and Haline Forcing
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DOI：
10.1175/jpo-d-12-0179.1
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发表时间：
2013-10
影响因子：
3.5
通讯作者：
J. Zika;W. Sijp;M. England
中科院分区：
文献类型：
--
作者：
J. Zika;W. Sijp;M. England
摘要采用耦合气候模式和新的热力学方法研究了海洋环流的垂直热输送。使用温度-深度坐标中的流函数，根据单元是热直接（向上的通量热）还是间接（向下的通量热）来识别。然后将这些单元投影到地理和其他热力学坐标中。模式中确定了三个单体：与南极底水相对应的热直接单体，与经向翻转环流上肢相对应的热间接深层单体，与表层副热带环流相对应的热直接浅层单体。研究了热间接深层电池的维持机制。深层细胞内下沉的水比上涌的水含盐量更高，这是因为在更广泛的温盐环流中，上肢和副热带环流之间存在耦合。尽管下沉的海水含盐量较高，但深细胞仍…
AbstractVertical transport of heat by ocean circulation is investigated using a coupled climate model and novel thermodynamic methods. Using a streamfunction in temperature–depth coordinates, cells are identified by whether they are thermally direct (flux heat upward) or indirect (flux heat downward). These cells are then projected into geographical and other thermodynamic coordinates. Three cells are identified in the model: a thermally direct cell coincident with Antarctic Bottom Water, a thermally indirect deep cell coincident with the upper limb of the meridional overturning circulation, and a thermally direct shallow cell coincident with the subtropical gyres at the surface. The mechanisms maintaining the thermally indirect deep cell are investigated. Sinking water within the deep cell is more saline than that which upwells, because of the coupling between the upper limb and the subtropical gyres in a broader thermohaline circulation. Despite the higher salinity of its sinking water, the deep cell tr...