Global heat and salt transports by eddy movement
Global heat and salt transports by eddy movement
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DOI：
10.1038/ncomms4294
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发表时间：
2014-02-01
影响因子：
16.6
通讯作者：
Chen, Dake
中科院分区：
文献类型：
--
作者：
Dong, Changming;McWilliams, James C.;Chen, Dake
海洋中尺度涡旋在全球范围内对水平热盐输送起着重要的作用。这里我们表明，涡旋输送主要是由于个别涡旋运动。理论和观测分析表明，由于地球自转的原因，气旋和反气旋涡旋向西移动，它们也分别向极地和赤道方向移动。单个涡旋内部的温度和盐度（T/S）异常由于内部水团的平流捕获而随涡旋移动，因此涡旋运动引起热盐输送。卫星高度计海面高度异常数据用于跟踪单个涡流，并使用Argo浮标的垂直剖面计算T/S异常。涡旋运动估计的经向热输运在量级和空间结构上与以前发表的模式的涡旋相关方差估计相似，涡旋热输运和盐输运在各自的总输运中都占相当大的比例。
Oceanic mesoscale eddies contribute important horizontal heat and salt transports on a global scale. Here we show that eddy transports are mainly due to individual eddy movements. Theoretical and observational analyses indicate that cyclonic and anticyclonic eddies move westwards, and they also move polewards and equatorwards, respectively, owing to the b of Earth's rotation. Temperature and salinity (T/S) anomalies inside individual eddies tend to move with eddies because of advective trapping of interior water parcels, so eddy movement causes heat and salt transports. Satellite altimeter sea surface height anomaly data are used to track individual eddies, and vertical profiles from co- located Argo floats are used to calculate T/S anomalies. The estimated meridional heat transport by eddy movement is similar in magnitude and spatial structure to previously published eddy covariance estimates from models, and the eddy heat and salt transports both are a sizeable fraction of their respective total transports.