夏季长江口东北部海域DO的分布及低氧特征  

Distribution of Dissolved Oxygen and Hypoxia Characteristics in the Northeast Sea of the Yangtze Estuary

作　　者：韦钦胜[1,2] 战闰[1,2] 魏修华[1,2] 臧家业[1,2] 王守强[1,2] 王宗兴[1,2] 

机构地区：[1]国家海洋局第一海洋研究所海洋生态研究中心,山东青岛266061 [2]海洋生态环境科学与工程国家海洋局重点实验室,山东青岛266061

出　　处：《海洋科学进展》2010年第1期32-40,共9页Advances in Marine Science

基　　金：我国近海海洋综合调查与评价专项--ST03区块水体环境调查与研究(908-01-ST03)

摘　　要：基于2006年7月18—23日对长江口东北部海域的大面调查资料,重点分析了该海域DO的分布特征,初步探讨了DO与温度、盐度、叶绿素和营养盐等各要素分布之间的关系。研究显示,2006年7月长江口东北部海域DO的质量浓度范围为1.36~8.81 mg/L,平均值为6.25 mg/L;调查海域（122°-123°E,32°~33°N）底层存在较为严重的DO亏损现象,表明长江口外DO低值区7月份在长江口东北部海域也存在一定程度的扩展;夏季台湾暖流北上引起的海水层化作用、表层生物繁殖引起的大量有机碎屑的沉降和氧化分解,可能是致使调查海域底层出现一定面积的DO低值区和DO亏损现象的2个主要原因。Based on the data from the cruise carried out in the northeast sea of the Yangtze Estuary in July 18-23,2006,this paper is focused on the analysis of the distribution of dissolved oxygen（DO）,and the preliminary discussion about the relationships of DO with the elements of temperature,salinity,chlorophyll-a and nutrients.The results show that in July,2006,DO mass concentrations in the northeast sea of the Yangtze Estuary ranged from 1.36 to 8.81 mg/L,with the mean value of 6.25 mg/L.Heavier hypoxia phenomenon was found in the bottom water（122°～123°E,32°～33°N）,i.e.the low-oxygen area of the Yangtze Estuary became further spreaded in the northeast sea of the Yangtze Estuary in July.The water column stratification caused by the northward extension of Taiwan Warm carrent,the subsidence decomposition and oxidation of a large quantity of organic debris from biological reproduction in the surface water might be the main factors for the hypoxia in the bottom water of the surveyed sea.

关 键 词：长江口 溶解氧(DO) 分布特征 低氧区 

分 类 号：P734.2[天文地球—海洋化学]