冬季和夏季长江口及其邻近海域一氧化碳的分布、海-气通量和微生物消耗的研究  

Distribution,flux and microbial consumption of carbon monoxide in the Changjiang Estuary in winter and summer

作　　者：杨晨 张婧[1,2,3] 杨桂朋 YANG Chen;ZHANG Jing;YANG Guipeng(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China;Institute of Marine Chemistry,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266237 [3]中国海洋大学海洋化学研究所,山东青岛266100

出　　处：《海洋环境科学》2023年第6期813-824,共12页Marine Environmental Science

基　　金：国家重点研发计划项目(2016YFA0601301)。

摘　　要：海洋是大气中一氧化碳(CO)的重要来源,河口区域在调节气候活性气体收支方面发挥着重要作用。本文旨在研究长江口作为典型河口在全球海洋CO生物地球化学循环中的地位,并进一步了解河口区域海水和大气中CO浓度的变化情况。本文基于2021年冬季和夏季在长江口及其邻近海域的现场调查,对该海域CO分布、海-气通量和微生物消耗速率进行了研究。结果表明,冬季和夏季调查海域大气中CO的体积分数平均值分别为(530.39±120.40)×10^(-9)和(416.91±102.01)×10^(-9),大气中CO含量受人类活动影响较大;受光照强度和陆源输入有机物的影响,夏季表层海水中CO的浓度平均值[(4.52±2.13)nmol/L]显著高于冬季[(1.30±0.79)nmol/L];相应地,夏季海—气通量平均值[0.95μmol/(m^(2)·d)]亦显著高于冬季[0.10μmol/(m^(2)·d)]。冬季的微生物消耗速率常数(kbio)的平均值[(0.46±0.31)/h]明显高于夏季[(0.26±0.07)/h],其空间分布差异不大。本文的研究结果有助于深入认识河口区域在全球海洋CO生物地球化学循环中的地位。The ocean is an important source of carbon monoxide(CO)in the atmosphere,and estuarine regions play an important role in regulating the balance of climate-active gases.This study aims to investigate the status of the Changjiang Estuary as a typical estuary in the global marine CO biogeochemical cycle,as well as to further understand the variations in CO concentrations in estuarine seawater and the atmosphere.Field surveys were conducted in the winter and summer of 2021 in the Changjiang Estuary and its adjacent waters to study the distribution of CO,sea-to-air fluxes,and microbial consumption rate of CO.The results showed that the average volume fractions of CO in the surveyed waters in winter and summer were(530.39±120.40)×10^(-9) and(416.91±102.01)×10^(-9),and the atmospheric CO content was greatly influenced by human activities.The mean concentration of CO in summer[(4.52±2.13)nmol/L]was significantly higher than that in winter[(1.30±0.79)nmol/L]due to the influence of light intensity and input of organic matter from land sources.Correspondingly,the mean sea-air flux in summer[0.95μmol/(m^(2)·d)]was significantly higher than that in winter[0.10μmol/(m^(2)·d)].In the study of microbial consumption rates,the average values of the microbial consumption rate constant(kbio)in winter[(0.46±0.31)/h]was significantly higher than that in summer and[(0.26±0.07)/h],and the distribution of kbio did not show significant spatial variation in the study area.The data provided in this study can help us deepen our understanding of the status of estuarine regions in the global marine CO biogeochemical cycle.

关 键 词：一氧化碳 浓度分布 海—气通量 微生物消耗 长江口及其邻近海域 

分 类 号：P734[天文地球—海洋化学] X142[天文地球—海洋科学]