大风事件对长江口及邻近海域海-气CO2通量的影响

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

doi:10.3969/j.issn.1001-909X.2020.01.005

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海洋学研究 ›› 2020, Vol. 38 ›› Issue (1) : 42-49. DOI: 10.3969/j.issn.1001-909X.2020.01.005

研究论文

大风事件对长江口及邻近海域海-气CO₂通量的影响

苗燕熠^1,3, 王斌^*1,3, 李德望^1,3, 金海燕^1,2,3, 江志兵^1,3, 马晓^2,3, 于培松^1,3, 陈建芳^*1,2,3, 王俊洋^1,3

作者信息 +

The effect of strong wind on air-sea CO₂ flux in the Changjiang River Estuary and its adjacent sea areas

MIAO Yanyi^1,3, WANG Bin^*1,3, LI Dewang^1,3, JIN Haiyan^1,2,3, JIANG Zhibin^1,3, MA Xiao^2,3, YU Peisong^1,3, CHEN Jianfang^*1,2,3, WANG Junyang^1,3

Author information +

文章历史 +

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。

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.

导出引用

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 https://doi.org/10.3969/j.issn.1001-909X.2020.01.005

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 https://doi.org/10.3969/j.issn.1001-909X.2020.01.005

中图分类号： P734

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