Oxygen depletion off the Changjiang (Yangtze River)Estuary

作     者：LI Daoji ZHANG Jing HUANG Daji WU Ying LIANG Jun 李道季;张经;黄大吉;吴莹;梁俊

作者机构：State Key Laboratory of Estuarine and Coastal ResearchEast China Normal UniversityShanghai 200062China Second Institute of OceanographyState Oceanic AdministrationHangzhou 310012China 

出 版 物：《Science China Earth Sciences》 (中国科学(地球科学英文版))

年 卷 期：2002年第45卷第12期

页      面：1137-1146页

核心收录：

学科分类：07[理学] 

基　　金：This study was made under the auspices of the National Key Basic Research Program of the Ministry of Science and Technology P.R.China(Grant No.G1999043705)and the Shanghai Priority Academic Discipline 

主　　题：oxygen depletion dissolved oxygen hypoxia Changjiang Estuary 

摘      要：In a survey on the Yellow Sea and the East China Sea on August 20-30 of 1999,we found a hypoxic zone(2 mg/L)of 13700 km2 with an average thickness of 20m at the bottom of the Changjiang(Yangtze River)Estuary,with an oxygen minimum value of 1 mg/*** extension of the dissolved oxygen deficiency extended to the 100m isobath in a southeastward direction along the bottom of the continental shelf of the East China *** the last two decades,the minimum dissolved oxygen values in the low oxygen region of the Changjiang Estuary have decreased from 2.85 mg/L to 1 mg/*** the hypoxic zone,the apparent oxygen utilization(AOU)was 5.8 mg/L and the total oxygen depletion approximately 1.59×10^(6) *** strong halocline above the hypoxic zone,as a result of affluent water from the Changjiang,Taiwan Warm Current(TWC),and the high concentrations of particle organic carbon(POC)and nitrogen(PON)are the major factors causing the formation of the hypoxic *** POC:PON ratios and nutrient concentration distributions in the hypoxic zone suggest that the oxygen deficiency in the bottom water during the summer in the East China Sea off the Changjiang is the result of organic carbon production enhanced by nutrients from the Changjiang and fluvial organic matter input,followed by a shift in regeneration of nutrients in the East China Sea.