海洋运动对大尺度风场响应的解析研究  

Analytic Research on the Response of Ocean Movement to Large-scale Wind Field

作　　者：赵艳玲[1,3] 邓冰[2,3] 张铭[3] 刘天军 

机构地区：[1]中国人民解放军61741部队,北京100094 [2]北京应用气象研究所,北京100029 [3]中国人民解放军理工大学气象学院大气环流与短期气候预测实验室,江苏南京211101

出　　处：《海洋科学进展》2012年第3期328-337,共10页Advances in Marine Science

基　　金：国家重点基础研究发展规划项目--北太平洋副热带环流变异对大气强迫的反馈作用(2007CB411805)

摘　　要：为探讨海洋向大尺度风应力响应的具体过程,建立了考虑海面风应力强迫的正压原始方程海洋模型,并利用Green函数做了解析求解和讨论。发现风应力引起的Ekman抽吸正比于风应力旋度。得到了海洋向风应力响应的具体形式:即海洋流场和压力场进行着准平衡的演变,并有海洋中压力梯度与科氏力之间的准地转平衡以及海洋Ekman体积输送的散度场与风应力旋度场之间的准平衡;此时有短周期的重力惯性波被激发,该波会较快弥散掉;而准平衡的演变则始终持续着。海洋在大尺度风场的强迫下的运动由重力惯性波、强迫惯性振荡和缓慢演变的准平衡过程三部分组成;前两部分是快过程,第一部分更快,第三部分是慢过程。最终海洋运动表现为强迫惯性振荡和准平衡演变过程的叠加。A barotropic primitive ocean model forced by the sea surface wind stress is established for discus- sing the response processes of the ocean to the large-scale wind stress, and the Green function is used to solve the analytic solutions of the ocean equations. It has been found that the strength of the Ekman pum- ping induced by wind stress is positively proportional to the curl of wind stress, and that the response form of the ocean to the wind stress can be described as a quasi-equilibrium evolution between the flow field and the pressure field in the ocean, which includes the quasi-geostrophic equilibrium between the pressure gra- dient in the ocean and the Coriolis force and the quasi-equilibrium between the divergence of Ekman trans- portation and the wind stress curl. Meanwhile, inertia gravity waves with short period will be excited out, but disperse very soon. However, the quasi-equilibrium evolution is always sustained. The ocean move- ment forced by large-scale wind field consists of the following three parts： the inertia gravity waves, the forced inertial oscillation and the quasi-equilibrium evolution. The first two parts are quick processes, with the first one being quicker than the second, and the third one is a slow process. The final performance of the ocean movement is the superimpostion of the forced inertial oscillation and the quasi-equilibrium evolu- tion.

关 键 词：大尺度风场 海洋模型 响应 EKMAN抽吸 

分 类 号：P732[天文地球—海洋科学]