2011年长江口-东海P-PN断面碳酸盐体系参数的季节分布特征及影响因素  

Seasonal distributions and influencing factors of seawater carbonate system parameters along the Changjiang(Yangtze River)Estuary-East China Sea P-PN transects in 2011

作　　者：王斌 刘希真[4] 李林蔚[1,2,6] 李德望 金海燕[1,2,5,6] 高生泉 李宏亮 陈建芳[1,2,5,6,7] WANG Bin;LIU Xizhen;LI Linwei;LI Dewang;JIN Haiyan;GAO Shengquan;LI Hongliang;CHEN Jianfang(Key Laboratory of Marine Ecosystem Dynamics,Ministry of Natural Resources,Hangzhou 310012,China;Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;Observation and Research Station of Yangtze River Delta Marine Ecosystems,Ministry of NaturalResources,Zhoushan 316021,China;Zhejiang Marine Monitoring and Forecasting Center,Hangzhou 310007,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Hangzhou 310012,China;Ocean College,Zhejiang University,Zhoushan 316021,China;Ocean College,Hohai University,Nanjing 210098,China)

机构地区：[1]自然资源部海洋生态系统动力学重点实验室,浙江杭州310012 [2]自然资源部第二海洋研究所,浙江杭州310012 [3]自然资源部长三角海洋生态环境野外科学观测研究站,浙江舟山316021 [4]浙江省海洋监测预报中心,浙江杭州310007 [5]卫星海洋环境动力学国家重点实验室,浙江杭州310012 [6]浙江大学海洋学院,浙江舟山316021 [7]河海大学海洋学院,江苏南京210098

出　　处：《海洋学研究》2021年第4期39-51,共13页Journal of Marine Sciences

基　　金：国家自然科学基金-浙江两化融合联合基金(U1709201);中央级公益性科研院所基本科研业务费专项资金资助项目(SZ2001);“全球变化与海气相互作用”专项二期任务(长江口缺氧酸化预警监测);国家自然科学基金(41806095,41706120);国家重点基础研究发展计划(2010CB428900)。

摘　　要：海水碳酸盐体系参数是反映碳循环调控机理和季节性酸化过程的重要海水化学参数。本文根据2011年3月、7月、11月和12月4个不同季节航次获取的长江口海域海水碳酸盐体系参数,探讨了长江口-东海P断面溶解无机碳(DIC)和总碱度(TA)的空间分布特征及其影响因素。结果表明:内陆架区,DIC和TA的平均值均表现为:夏季<秋季<冬季<春季;垂直分布上,夏季和秋季受长江冲淡水影响出现层化现象,春季和冬季均垂直混合较均匀。东海内陆架DIC与温度和DO呈显著负相关;TA则受温度和DO变化影响较小,与盐度呈正相关。结合2011年东海外陆架的PN断面数据分析,DIC和pH分别与表观耗氧量(AOU)呈显著正相关和负相关,东海外陆架的pH/AOU的斜率为-0.0027 pH/(μmol·kg^(-1));而内陆架区的pH/AOU的斜率为-0.0018 pH/(μmol·kg^(-1)),低于黑潮次表层水中pH/AOU的斜率。东海内陆架区由于存在季节性的通风作用以及较强的海水碳酸盐体系缓冲能力,底层水体中因有机质耗氧降解导致的季节性酸化信号在一定程度上得到了缓解。The acquisition of seawater carbonate system parameters is essential to understand the carbon cycle in coastal ocean,the pattern of CO_(2) sources and sinks and assess the potential of carbon sinks.Based on the data obtained by 4 seasonal cruises conducted off Changjiang(Yangtze River)Estuary and adjacent East China Sea in March,July,November and December in 2011,we discuss the seasonal and spatial distributions of dissolved inorganic carbon(DIC)and total alkalinity(TA)and their influencing factors.The results showed that the averaged DIC and TA concentrations in inner shelf were increased from summer to autumn,then winter to spring;In cross-section distribution,DIC and TA in summer and autumn showed stratification pattern due to the influence of Changjiang Diluted Water,while in spring and winter,DIC and TA were vertically uniform due to mixing.In inner East China Sea shelf,transect DIC showed a significant negative correlation with temperature and dissolved oxygen,while TA was less regulated by temperature and dissolved oxygen changes,but positively correlated with salinity.DIC was significantly positively correlated with apparent oxygen consumption(AOU),while pH was significantly negatively correlated with AOU.The slope of pH/AOU in the outer East China Sea shelf was-0.0027 pH/(μmol·kg^(-1)),which was much higher compared with that of-0.0018 pH/(μmol·kg^(-1))in the inner shelf.The inner East China Sea shelf seawater(water depth is less than 200 meters)was affected by seasonal ventilation and had stronger carbonate system buffer capacity,which alleviated the seasonal acidification in the subsurface water induced by organic matter decomposition.

关 键 词：海水碳酸盐体系 季节特征 长江口 东海 黑潮次表层水 海洋酸化 

分 类 号：P734[天文地球—海洋化学]