2004年夏初、秋末长江口外海区冲淡水及羽状锋的盐度特征  

SALINITY DISTRIBUTION OF DILUTED WATER AND PLUME FRONT OF EARLY SUMMER & LATE AUTUMN IN 2004 OFF CHANGJIANG (YANGTZE) ESTUARY

作　　者：郑琰明[1] 康建成[2,1] 钟巍[1] 周尚哲[1] 王芳[3] 徐韧[4] 孙瑞文[4] 吴涛[2] 

机构地区：[1]华南师范大学地理科学学院,广州510631 [2]上海师范大学城市生态与环境研究中心,上海200234 [3]南京大学海岸与海岛开发教育部重点实验室,南京210093 [4]国家海洋局东海环境监测中心,上海200137

出　　处：《海洋与湖沼》2009年第3期275-282,共8页Oceanologia Et Limnologia Sinica

基　　金：上海市科委攻关课题项目:062412049号;上海市教委重点学科“地理学与城市环境”项目:J50402号;上海市教育委员会科研创新重点项目:08ZZ69号

摘　　要：用国家海洋局东海环境监测中心2004年夏初(6月)和秋末(11月)对长江口外海区现场观测资料,用Matlab计算机编程语言对观测资料进行质量控制、插值网格化,绘制研究海区盐度立体分布图,显示夏初、秋末两季的盐度分布特征。将2004年夏、秋两季长江口外海区冲淡水和羽状锋的分布与以往观测研究结果对比,可得:(1)长江口外海区冲淡水的盐度值主要在5—31之间,冲淡水前缘盐度锋面的盐度值为18—28;盐度值20—28的盐度锋面基本体现该海区羽状锋的特征及变化。(2)夏初长江口外海区冲淡水范围明显大于秋末,夏初该海区以冲淡水为主,秋末冲淡水的范围收缩,紧贴沿岸一带。相应地,夏初该海区羽状锋呈倾斜锋面,占据较大的海区;秋末则为垂直锋面,介于122.50°E—122.70°E海区。Salinity data of early summer and late autumn of 2004 recorded in the areas off the Changjiang （Yangtze） Estuary by the East China Sea Environment Monitoring Center were used to analyze the salinity distribution. Using program MATLAB, the data were processed in quality-control procedures, and then interpolated to standard grids for drawing 3-D figures. This study shows that, in the study area, the salinity varied from 5 to 31 for the diluted water, and 18 to 28 for the front edge. The salinity front, also the plume front, was between 20 and 28. In early summer 2004, the extent of the diluted water was more oceanward, and the plume front was gradient in a wider area than those in the late autumn when diluted water shrank coastward and the plume front became almost vertical between 122.50°E-122.70°E.

关 键 词：长江口外海区 河口 近岸环境 冲淡水 羽状锋 盐度锋面 

分 类 号：P731[天文地球—海洋科学]