东海中北部海域秋季表层海水中无机碳与海气界面碳的迁移  

Dissolved inorganic carbon and air-sea carbon exchange flux in the central and northern East China Sea in autumn

作　　者：朱连磊[1,2] 宋金明[1] 李学刚[1] 袁华茂[1] 李宁[1] 段丽琴[1,2] 于宇[1,2] 

机构地区：[1]中国科学院海洋研究所海洋生态与环境科学重点实验室,山东青岛266071 [2]中国科学院研究生院,北京100049

出　　处：《海洋科学》2012年第10期26-32,共7页Marine Sciences

基　　金：国家973项目课题(2010CB951802);中国科学院战略性先导科技专项项目课题(XDA01020304);国家基金委创新群体项目(41121064)资助

摘　　要：基于2010年11月对长江口外东海中北部海域的综合调查，系统研究了该海域的无机碳体系参数的分布特征、海一气界面二氧化碳通量及其影响因素。研究结果表明，该海域秋季溶解无机碳（DIC）高值区主要出现在调查海域东北部及长江口附近海域，而调查海域南部DIC含量较少且变化平缓，其主要是受台湾东部流向东北方向的黑潮支流及长江冲淡水的影响；表层海水C02分压（pC02）值变化范围为40．8～63．5Pa，呈现沿黑潮支流流八方向由东南向西北逐渐增高的趋势。秋季表层海水pCO：与温度（T）、盐度（∞有较好的负相关性，说明海水温度升高和盐度增加，pC02降低，反之亦然。另外，通过估算得出，秋季CO2海-气交换通量为2．69-33．66mmol／（m^2·d），平均值为（14．35-4-7．06）mmol／（m^2·d），其在长江口邻近海域相对较大，而在调查海域南部相对较小；2010年秋季水体向大气释放C02的量（以碳计）为（2．35±1．16）×10^4t／d，是大气C02较强的源，说明东海中北部海域秋季总体上是CO2的源。Based on the comprehensive survey in the central and northern East China Sea near the Yangtze River estuary in November 2010, the distribution of the dissolved inorganic carbon system and air-sea exchange flux of carbon dioxide and its influencing factors were examined in this paper. High DIC was found in the northeast of the investigated area and Yangtze River estuary, whereas DIC content was small and changed gently in the south of the investigated area. The investigated area was mainly affected by the Kuroshio Branch Current which flows from the east part of Taiwan to northeast and Changjiang River Diluted Water.The pCO2 ranged from 40.8 - 63.5 Pa with an increasing trend from southeast area to northwest area along the KBCNT. The pCO2 in the surface water negatively correlated with temperature and salinity, suggesting that with the increase of the temperature and salinity, the pCO： decreased, and vice versa. In addition, according to calculation, the net sea-to-air CO2 exchange flux in autumn at each station was obtained. It varied from 2.69 to 33.66 mmol/（m^2 · d） with an average of （14.35 ± 7.06） mmol/（m^2 · d）. The carbon flux near the Yangtze River Estuary was higher than that in the south part of the investigated area. Overall, the central and northern East China Sea emitted 2.35×10^4 1.16×104 tons of carbon to the atmosphere per day which was a relatively strong source of atmospheric CO2 in autumn.

关 键 词：海-气界面碳通量 海水无机碳 东海中北部海域 

分 类 号：P734.4[天文地球—海洋化学]