2009-2010年冬季南海东北部中尺度过程观测  

Mesoscale observation in the northeast South China Sea during winter 2009-2010

作　　者：刘长建[1,2] 庄伟[1] 夏华永[2] 杜岩[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境国家重点实验室,广东广州510301 [2]国家海洋局南海工程勘察中心,广东广州510300

出　　处：《海洋学报》2012年第1期8-16,共9页

基　　金：我国近海海洋综合调查与评价专项--南海北部坡折带水体环境调查与研究项目(908-01-BC10);南海北部环流的动力学诊断分析项目(0871);中国科学院知识创新工程项目(KZCX2-YW-BR-04);NSFC-广东联合基金(U1033003);863项目(2008AA09A402)

摘　　要：根据南海北部陆架陆坡海域2009-2010年冬季航次的CTD调查资料,发现西北太平洋水在上层通过吕宋海峡入侵南海,其对南海东北部上层水体温盐性质的影响自东向西呈减弱趋势,影响范围可达114°E附近。入侵过程中受东北部海域反气旋式涡旋(观测期间,其中心位于20.75°N,118°E附近)的影响,海水的垂向和水平结构发生了很大变化,特别是涡旋中心区域,上层暖水深厚,混合层和盐度极大值层显著深于周边海域。该暖涡在地转流场、航载ADCP观测海流及卫星高度计资料中均得到了证实。暖涡的存在还显著影响了海水化学要素的空间分布,暖涡引起的海水辐聚将上层溶解氧含量较高的水体向下输运,使次表层的暖涡中心呈现高溶解氧的分布特征。According to the obtained CTD data of northern South China Sea（SCS） shelf and slope area during the winter cruise in 2009-2010,it found that the northwest pacific water intruded into SCS in the upper layer through Luzon Strait,its effect on tempearture and salinity of northeastern SCS upper layer water decreased from east to west and extended up to about 114°E.Due to the effect of anticyclone eddy in the northeastern SCS during intrusion processing,the vertical and horizontal structure of water mass changed remarkably,especially in the center erea of eddy,the depth of mixed layer and salinity maximum layer is evidently deeper than the surrounding area.The warm eddy was confirmed from the geostrophic current,ADCP current and satellite altimeter data.The existence of warm eddy also affacted the spacial diffusion of chemistry elements markedly.Due to the water convergency caused by warm eddy,the upper layer water with higher concentration dissolved oxygen was transported downwards which induced higher concentration dissolved oxygen existing in the center of warm eddy in upper layer.

关 键 词：南海东北部 水团性质 暖涡 溶解氧 

分 类 号：P722.7[天文地球—海洋科学] P731.21