Numerical Experiments on Seasonal Variations of the Wind-Driven flow and its Mechanics

为了弄清观测到的风生气流季节变化的机制和特征，进行了数值试验。我们发现，地表热通量日循环的季节变化对风生气流的变化起着非常重要的作用。通过推导日循环下风生流的解析解，估计了地表风生流的全球分布。全球分布表明，冬季高纬度地区的日循环影响很大。这些结果表明，应该考虑地表热通量的日循环，以便更准确地预测风生流动和地表漂移。

To clarify mechanism and characteristics of observed seasonal variations in the wind-driven flow, numerical experiments were performed. We found that seasonal variations in the diurnal cycle of a surface heat flux play most significant roles in the variation of the wind-driven flow. A global distribution of the surface wind-driven flow is estimated by deriving analytical solutions of the wind-driven flow under the diurnal cycle. The global distribution indicates a large impact of the diurnal cycle at higher latitudes in winter. These results suggest diurnal cycle of surface heat flux should be taken into account for more accurate predictions of the wind-driven flow and surface drift