摘要
基于2023年秋季在中国东海的现场调查,研究该海域一氧化碳(CO)的浓度分布特征,估算CO海-气通量,测定表层海水CO微生物消耗和暗反应生成速率.结果表明,东海大气CO的混合比为61.15~234.26ppbv,平均值为(98.47±49.64) ppbv.用顶空分析法测定的表层海水中CO的浓度为0.20~1.63nmol/L,平均值为(0.63±0.71) nmol/L.各水层CO浓度日变化显著,表现为午后浓度最高,凌晨前后浓度最低.垂直剖面显示,CO浓度随深度的增加而减小.CO的海-气通量为0.45~5.66μmol/(m^(2)·d),平均值为(2.11±2.89)μmol/(m^(2)·d),表明东海是大气CO的源.表层海水CO微生物消耗速率常数为0.16~0.33/h,平均值为(0.22±0.07)/h.CO浓度消耗过程表现出一级反应动力学特征.CO暗反应生成速率为0.023~0.20nmol/(L·h),平均值为(0.12±0.14)nmol/(L·h),CO浓度随时间增长线性增加.本次调查对中国东海CO的源-汇过程进行了补充,有助于深入理解陆架海域CO生物地球化学过程及其气候效应.
A field survey was conducted in the East China Sea in autumn 2023 to study the distributions of carbon monoxide(CO)concentration,estimate the sea-to-air fluxes,and measure the microbial consumption and dark production rates of CO in the surface seawater.The results showed that atmospheric CO mixing ratios of the East China Sea ranged from 61.15 to 234.26 ppbv,with an average of(98.47±49.64)ppbv.A headspace analysis system was used to determine CO.The concentrations of CO in the surface seawater ranged from 0.20 to 1.63 nmol/L,with an average of(0.63±0.71)nmol/L.The CO concentrations exhibited noticeable daily variations across different water layers,with a maximum at noon and a minimum around dawn.The results of vertical distributions showed that the CO concentrations decreased gradually with the increase of depth.The sea-to-air fluxes of CO ranged from 0.45 to 5.66μmol/(m^(2)·d),with an average of(2.11±2.89)μmol/(m^(2)·d).The results of sea-to-air fluxes estimation showed that the East China Sea was a source of atmospheric CO.The microbial consumption rate constants of CO in the surface seawater ranged from 0.16 to 0.33/h,with an average of(0.22±0.07)/h.The consumption process showed the characteristics of first-order reaction.Dark production rates varied from 0.023 to 0.20nmol/(L·h),with an average of(0.12±0.14)nmol/(L·h).The concentrations of CO increased linearly with the increase of time.This survey complements the source-sink processes of CO in the East China Sea,and contributes to a further understanding of the CO biogeochemical processes and its climatic effect in the continental shelf sea area.
作者
庞娇娇
褚礼轩
侯雯彧
张婧
何真
杨桂朋
PANG Jiao-jiao;CHU Li-xuan;HOU Wen-yu;ZHANG Jing;HE Zhen;YANG Gui-peng(College of Chemistry Engineering,Ocean University of China,Qingdao 266100,China,Key Laboratory of Ministry of Education for Marine Chemistry Theory and Technology;Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China)
出处
《中国环境科学》
北大核心
2025年第8期4656-4666,共11页
China Environmental Science
基金
国家自然科学基金重点项目(42330402)
泰山学者攀登专家项目(tspd20240805)资助。
关键词
一氧化碳
浓度分布
海-气通量
微生物消耗
暗反应
中国东海
carbon monoxide
distribution
sea-to-air flux
microbial consumption
dark production
East China Sea
