| 大风事件对长江口及邻近海域海-气CO2通量的影响 |
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| 引用本文： | 苗燕熠,王斌,李德望,金海燕,江志兵,马晓,于培松,陈建芳,王俊洋.大风事件对长江口及邻近海域海-气CO2通量的影响[J].海洋学研究,2020,38(1):42-49. |
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| 作者姓名： | 苗燕熠 王斌 李德望 金海燕 江志兵 马晓 于培松 陈建芳 王俊洋 |
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| 作者单位： | 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.卫星海洋环境动力学国家重点实验室,浙江 杭州310012;3.自然资源部 第二海洋研究所,浙江 杭州 310012 |
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| 基金项目： | 浙江省自然科学基金项目资助(LQ17D060006);国家自然科学基金项目资助(U1709201,41706120,41806095);中央级科研院所基本科研业务费专项资金项目资助(JG1529,JT1502) |
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| 摘 要： | 依托2017年8月23日至2017年9月6日在长江口及邻近海域连续走航测得的二氧化碳分压(pCO2)值,结合温度、盐度、溶解氧等数据,阐述该海域pCO2的分布特征,并利用一次大风事件前后一个断面的重复观测数据,讨论天气事件对长江口海-气CO2通量的影响。夏季长江口及邻近海域表层海水pCO2范围为145~929 μatm,总体呈近岸高远岸低的分布特征,在受长江冲淡水影响的区域,海表pCO2较低,整体表现为大气CO2的汇。大风事件(最大风速达9.7 m·s-1)加强了水体的垂直混合,导致近岸区域从大气CO2的弱源变为强源(CO2通量从0.2±1.9上升到 55.0±12.4 mmol·m-2·d-1),而远岸区域的碳汇略有加强(CO2通量从-12.7±2.3变为-16.8±2.5 mmol·m-2·d-1)。因此,在估算东海海-气CO2通量时,台风、冷空气等短时间尺度天气事件的影响也不容忽视。
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| 关 键 词： | 长江口 海-气CO2通量 风混合 |
| 收稿时间： | 2019-05-09 |
The effect of strong wind on air-sea CO2 flux in the Changjiang River Estuary and its adjacent sea areas |
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| MIAO Yanyi,WANG Bin,LI Dewang,JIN Haiyan,JIANG Zhibin,MA Xiao,YU Peisong,CHEN Jianfang,WANG Junyang.The effect of strong wind on air-sea CO2 flux in the Changjiang River Estuary and its adjacent sea areas[J].Journal of Marine Sciences,2020,38(1):42-49. |
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| Authors: | MIAO Yanyi WANG Bin LI Dewang JIN Haiyan JIANG Zhibin MA Xiao YU Peisong CHEN Jianfang WANG Junyang |
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| Institution: | 1. Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, China;2. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;3. Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China |
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| Abstract: | Underway sea surface pCO2, sea surface temperature, sea surface salinity data, and discrete DO data in the East China Sea were obtained from August 23, 2017 to September 6, 2017. The distributions of pCO2 in the Changjiang River Estuary and the adjacent sea areas were examined. Meanwhile, the effect of strong wind on air-sea CO2 flux in this area was discussed based on data of a revisited section before and after a strong wind event. The results show that sea surface pCO2 (145~929 μatm) in the study area was higher in the nearshore and lower in the offshore area. Biological production consumed dissolved inorganic carbon, and lowered sea surface pCO2 of the Changjiang plume waters, which acted as carbon sink. The wind event (the maximum wind speed was 9.7 m·s－1) triggered vertical mixing, enhanced carbon source significantly at nearshore area(from 0.2±1.9 to 55.0±12.4 mmol·m－2·d－1). While, the estimated CO2 sink at offshore waters was stronger than that before the wind (from -12.7±2.3 to -16.8±2.5 mmol·m－2·d－1). Therefore, large bias in air-sea CO2 flux estimation will be introduced if the influence of typhoon and cold-air events are not considered. |
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| Keywords: | the Changjiang River Estuary air-sea CO2 flux wind mixing |
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