Estimation of Meridional Heat Flux in the North Atlantic by Inverse Methods
Estimation of Meridional Heat Flux in the North Atlantic by Inverse Methods
复制标题
反演法估算北大西洋经向热通量
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
D. Roemmich
中科院分区：
文献类型：
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作者：
D. Roemmich
本文利用大西洋24 °、36 °和48°N的水文断面资料，估算了大西洋的纬向热通量。反演方法提供了参考水平的地转计算速度，符合假设的质量和盐在一个多层海洋守恒。热通量的计算是根据地转总速度和观测温度进行的。研究发现，北大西洋热量输送的主要机制是由向北流动的表层水与向南流动的深层水相平衡的纬向环流。用24°N时的数据确定纬向环流的强度最好。这是由于较高的信息含量和较低的噪音，从地形粗糙度，在南部样带。对热通量进行非地转订正后，得到的总向北热通量在24°N为120× 10 ~（13）W，在36°N为80× 10 ~（13）W。在48°N时，热通量的测定很差。认为该技术是一种可行的方法。
Abstract Hydrographic sections spanning the Atlantic Ocean at 24, 36 and 48°N are used to make an estimate of meridional heat flux in the ocean. An inverse method provides reference level velocities for geostrophic calculations, consistent with assumptions of conservation of mass and salt in a multilayered ocean. The heat-flux calculation is made on the total geostrophic velocity together with observed temperature. It is found that the dominant mechanism for heat transport in the North Atlantic is a meridional cell of northward flowing surface water balanced by deep southward flow. The strength of the meridional cell is determined best by the data at 24°N. This is attributed to higher information content and lower noise, from topographic roughness, in the southern transect. An ageostrophic correction to the heat flux is estimated, and the resulting total northward heat flux is 120×1013 W at 24°N and about 80×1013 W at 36°N. The heat flux was poorly determined at 48°N. It is concluded that the technique co...