吕宋海峡入流对南海北部中尺度涡的影响  

Influence of Luzon Strait Inflow on Mesoscale Eddy in the Northern South China Sea

作　　者：满文峥 裘是 陈学恩 Man Wenzheng;Qiu Shi;Chen Xueen(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋与大气学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2024年第12期1-10,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(42276011,U23A2032)资助。

摘　　要：本文以2011年为例,基于海洋模式(Oceanic regional circulation and tidal model,ORCTM)模拟的南海北部真实情况下的中尺度涡场和封闭吕宋海峡情况下的中尺度涡场,对比分析和研究了吕宋海峡入流对中尺度涡数量、传播特征的影响。结果表明,在边界层分离、正压不稳定和平流效应的影响下,吕宋海峡黑潮水入侵等海峡入流对南海北部海域涡旋的生成和传播具有较大影响。当封闭吕宋海峡时,关闭了黑潮水对南海的侵入,南海北部不存在黑潮弯曲区,无法通过边界层分离机制生成中尺度涡;同时,南海贯穿流强度和正压不稳定减弱,降低了涡流间的能量转移,抑制了涡旋的生成和存续时间,导致南海北部中尺度涡数量减少,生存时间缩短;此外,由于涡度倾向的平流效应减弱,南海北部中尺度涡的传播距离明显变短。本研究有助于深入理解海洋动力学机制和气候变化。Based on the Oceanic Regional Circulation and Tidal Model(ORCTM),this paper takes 2011 as an example to simulate the mesoscale eddy field in the northern South China Sea under real conditions and the mesoscale eddy field under the closed Luzon Strait.The influence of inflow in Luzon Strait on the number and propagation characteristics of mesoscale vortices is analyzed and studied.The results show that under the influence of boundary layer separation,positive pressure instability and advection effect,channel inflow such as black tide intrusion in the Luzon Strait has a great influence on the generation and propagation of vortices in the northern South China Sea.When the Luzon Strait is closed,the intrusion of Kuroshio into the South China Sea is closed.There is no Kuroshio bend area in the north of the South China Sea,and mesoscale vorticity cannot be generated through boundary layer separation mechanism.At the same time,the strength and positive pressure instability of the South China Sea penetrating current are weakened,which reduces the energy transfer between vortices,inhibits the generation and survival time of vortices,and leads to the reduction of the number of mesoscale vortices in the north of the South China Sea,and the survival time is shortened.In addition,due to the weakened advection effect of vorticity tendency,the propagation distance of mesoscale vorticity in the northern South China Sea is obviously shortened.

关 键 词：南海北部海域 中尺度涡 吕宋海峡 边界层分离 正压不稳定 平流效应 

分 类 号：P731.27[天文地球—海洋科学]