南海东北部地转运动与近惯性运动间动能交换的时空变化特征研究  

Studies on Spatio-Temporal Characteristics of the Kinetic Energy Transfer Between Geostrophic Motions and Near-Inertial Motions in the Northeastern South China Sea

作　　者：冯哲 缪明芳 孙忠斌[1,2,3] 张志伟 Feng Zhe;Miao Mingfang;Sun Zhongbin;Zhang Zhiwei(Frontier Science Center for Deep Ocean Multispheres and Earth System,the Key Laboratory of Oceanography,Ministry of Education,Ocean University of China,Qingdao 266100,China;Sanya Oceanographic Institution,Ocean University of China,Sanya 572024,China;Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)

机构地区：[1]中国海洋大学深海圈层与地球系统前沿科学中心,物理海洋教育部重点实验室,山东青岛266100 [2]中国海洋大学三亚海洋研究院,海南三亚572024 [3]青岛海洋科学与技术试点国家实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2023年第5期21-31,共11页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(42076004);中央高校基本科研业务费项目(202041009);“泰山”人才计划项目(tsqn202103032);国家重点研究发展计划项目(2022YFC310503)资助。

摘　　要：地转平衡运动与近惯性运动是海洋里普遍存在且含能较高的两种运动形态,二者间的相互作用与能量传递在大洋能量串级中扮演着重要角色。然而受到现场观测和数值模式时空分辨率不足等因素的制约,目前对于二者间动能交换的时空变化特征及其在二者动能收支中所扮演的角色尚不清晰。本文利用1/48(°) MITgcm数值模式资料,对南海东北部地转与近惯性运动的动能交换率时空变化特征进行了刻画,并定量评估了动能交换率在二者动能收支中的作用。研究结果表明,在地转动能较强的吕宋海峡区域,二者间的动能交换率显著高于地转动能较弱的南海东北部内区。在吕宋海峡,地转运动向近惯性运动正向传递动能,年平均总动能交换率为3.61×10^(-7)m^(3)·s^(-3),但季节变化不显著;在南海东北部内区,近惯性运动向地转运动逆向传递动能,且受黑潮入侵影响,表现为冬强(-11.37×10^(-8)m^(3)·s^(-3))、夏弱(-5.26×10^(-8)m^(3)·s^(-3))。与风场做功对比发现,二者的动能交换率在地转动能收支中可忽略不计,但在近惯性动能收支中扮演重要角色。The geostrophic balanced motions and near-inertial motions are two ubiquitous motions with higher energy in the ocean.Interaction and energy transfer between these two motions play important roles in the ocean energy cascade.However,due to the limitations of spatio-temporal resolution of both observations and numerical models,the knowledge of spatio-temporal characteristics of the kinetic energy transfer and the role in the energy budgets of these two motions are still unclear.In this manuscript,we investigated the kinetic energy transfer between these two motions in the northeastern South China Sea(SCS)using 1/48(°)MITgcm.The spatio-temporal characteristics of the kinetic energy transfer were depicted and its roles in the kinetic energy budget of these two motions were quantitatively evaluated.The results show that the kinetic energy transfer rate is stronger/weaker in the Luzon Strait/northeastern SCS interior where the geostrophic kinetic energy is stronger/weaker.In the Luzon Strait,the geostrophic motions transfer energy to the near-inertial motions indicating a forward energy cascade at an annual mean kinetic transfer rate of 3.61×10^(-7) m^(3)/s^(3).However,the seasonal variation of this energy transfer is inapparent.With respect to the northeastern SCS interior,the energy cascade is inverse with kinetic energy transferring from the near-inertial motions to the geostrophic motions.Influenced by the seasonal variation of Kuroshio intrusion,the kinetic energy transfer is stronger in winter(-11.37×10^(-8) m^(3)/s^(3))and weaker in summer(-5.26×10^(-8) m^(3)/s^(3)).By comparing with the wind stress work,it is revealed that the kinetic energy transfer between these two motions is negligible in the geostrophic energy budget but plays an important role in the energy budget of near-inertial motions.

关 键 词：地转运动 近惯性运动 能量交换 南海东北部 能量串级 

分 类 号：P722.7[天文地球—海洋科学]