摘要
分析和探讨了黄、东海交界海域32.3°N断面化学水文学精细化特征的季节性演替,结果显示:化学、水文学要素的空间区域化分布与该断面上环流场的布局及其季节转换存在良好的对应关系,水团配置对各要素含量及分布起着控制性作用;冬、春和秋季,在黄海西部沿岸流影响范围内出现的浊度和悬浮物浓度高值区多与营养盐浓度高值区和pH低值区相共存,可能是受东海北部气旋式涡旋所产生的辐聚效应的影响,此高值区中的悬浮物趋于向该海域的底层冷涡区沉积,夏季此特征则不明显,从而证实该海域悬浮物沉积作用具有"冬强夏弱"的特征;夏季123.5°—124.25°E范围海域内存在海水下沉现象,上层水体中的长江冲淡水可被携带至下层,导致在夏季长江冲淡水东北向扩展过程中一部分冲淡水从其主体中分离出来;夏季台湾暖流的阻隔作用使得悬浮物的影响范围远没有长江冲淡水的大,促使水体和物质输运发生分离。同时,根据水文和化学各要素分布之间的对应关系,初步勾勒出了32.3°N断面4季的水团配置状况,并通过分析东海北部冷水域典型站位的温、盐度垂直结构,在一定程度上印证了该冷水的形成过程。
Chemical hydrography and seasonal succession at 32.3°N transect in the border between the Yellow Sea and the East China Sea were analyzed and discussed. The results present that the vertical profiles of chemical and hydrological parameters varied significantly in space and time in good correlation with ocean circulation and its seasonal transition across the section, indicating that the content and distribution of chemical elements were controlled by water mass distribution. In winter, spring, and autumn, an area in high-suspended matter concentration and turbidity in the route of the Yellow Sea Western Coastal Current was found accompanied by high-concentration nutrients and low-pH. In addition, by possible impact of the radiation from the cyclonic vortex in the northern East China Sea, suspended matters in this area tended to deposit at the cold eddy center. However, this phenomenon was not obvious in summer, which indicate that sedimentation of suspended matters was stronger in the winter but weaker in the summer. In summer, waters in the area of 123.5°-124.25°E sank, in which the Changjiang diluted water in the upper layers could be carried downward, leaving partial diluted water away from the main body during the northeastward expansion of the Changjiang diluted water. Observation showed that the intrusion in summertime of clean Taiwan warm current caused much less diffusion of suspended matters than did by the Changjiang diluted water, resulting in the separation of water and substance transports. Meanwhile, as per hydrological profiling and chemical element distributions, we outlined preliminary the distributions of water groups in four seasons at the transect, and the vertical distributions of temperature and salinity in representative station in the cold eddy of the northern East China Sea, from which the formation process of the cold water was confirmed to some extents.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2013年第5期1170-1181,共12页
Oceanologia Et Limnologia Sinica
基金
我国近海海洋综合调查与评价专项
908-01-ST03号
国家自然科学青年基金项目
41206068号
中央级公益性科研院所基本科研业务费专项资金项目
GY02-2007T08和GY02-2012G13号
关键词
黄、东海交界海域
长江冲淡水
水团
化学要素
东海北部冷水
border region of the Yellow Sea and the East China Sea
Changjiang diluted water
water masses
chemical parameters
northern cold eddy of the East China Sea
