资源环境科技发展态势分析平台

Based on eddy‐rich (0.1° horizontal resolution for ocean) Community Earth System Model simulations, we compute the Ekman pumping induced vertical eddy heat flux using two formulations: the classical and the Stern Ekman pumping. The two mechanisms yield similar patterns in the eddy‐induced vertical heat flux, showing strong upward heat flux in ocean frontal regions such as the western boundary current regions. Using the Gulf Stream Extension region as an example, we estimate (1) the Stern Ekman pumping induced eddy heat flux is 23% and 12% of the total vertical eddy heat flux at 50m depth during summer and winter, respectively; (2) the classical Ekman pumping accounts for 82% and 88% of the Stern Ekman pumping induced eddy heat flux at 50m during summer and winter, respectively. The second finding indicates eddy‐current feedback on wind stress is the primary cause for the upward eddy heat flux generated by Ekman pumping.