西北太平洋冬季气溶胶中稳定碳同位素组成特征  

Stable carbon isotope composition in marine aerosols over the western North Pacific in winter

作　　者：曾梓琪 肖红伟 毛东阳[1,4] 伍作亭 黄启伟 龙爱民 ZENG Ziqi;XIAO Hongwei;MAO Dongyang;WU Zuoting;HUANG Qiwei;LONG Aimin(Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution,East China University of Technology,Nanchang 330013;Rosenstiel School of Marine and Atmospheric Science,University of Miami,Florida 331493;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013;School of Earth Sciences,East China University of Technology,Nanchang 330013;State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301)

机构地区：[1]东华理工大学,江西省大气污染成因与控制重点实验室,南昌330013 [2]迈阿密大学罗森斯蒂尔海洋和大气科学学院,佛罗里达331493 [3]东华理工大学水资源与环境工程学院,南昌330013 [4]东华理工大学地球科学学院,南昌330013 [5]中国科学院南海海洋研究所热带海洋环境国家重点实验室,广州510301

出　　处：《环境科学学报》2020年第7期2384-2390,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41663003);江西省重点实验室计划项目(No.20171BCD40010);江西省“双千计划”项目(No.S2018CQKJ0755)。

摘　　要：随着全球经济的快速发展,海洋大气受到了人为污染物的严重影响,并引起了广泛的关注.碳组分是海洋大气气溶胶的重要组成,对全球气候变化和海洋碳循环有着重要的影响.由于采样困难,有关偏远海域海洋气溶胶中总碳(TC)在传输过程中发生的化学反应及其污染来源的研究相对较少.因此,本研究于2014年12月-2015年3月期间搭载西北太平洋观测航次收集海洋大气气溶胶样品,并测定总碳(TC)浓度及其稳定碳同位素组成(δ13C).结果表明,海洋大气气溶胶TC平均浓度为(4.0±4.4)μg·m^-3,δ13C平均值为-26.6‰±0.8‰.近岸与远海的TC平均浓度分别为(6.0±6.8)、(3.1±2.7)μg·m^-3,δ13C平均值分别为-26.0‰±1.1‰、-26.9‰±0.4‰.根据后向轨迹分析结果可知,近岸与远海TC浓度和同位素的差异可能是由不同气团的来源导致,近岸总悬浮颗粒物(TSP)中TC主要来源于大陆的生物质燃烧和机动车尾气,而远海可能与二次有机气溶胶(SOA)的形成比例相对较高有关.With the rapid development of the economy and increasing demand for energy,marine atmospheric aerosols have been severely influenced by anthropogenic pollutants,which has caused widespread concern.Carbon is an important component of marine atmospheric aerosols and play a key role on global climate change and marine carbon cycle.However,there are few studies on the sources of total carbon(TC)in remote marine aerosols because of the sampling difficulties.In this study,we collected marine atmospheric aerosols from December 2014 to March 2015 over the western North Pacific to determine the total carbon concentration and its stable carbon isotope values(δ13C).The results show that the average concentration of TC was(4.0±4.4)μg·m^-3,and the average value ofδ13C was-26.6‰±0.8‰over the western North Pacific.The average concentrations of TC were(6.0±6.8)μg·m^-3 and(3.1±2.7)μg·m^-3 in the nearshore and remote region,and theδ13 C were-26.0‰±1.1‰and-26.9‰±0.4‰,respectively.According to the backward trajectories at different sampling sites,the differences of TC concentration andδ13 C between nearshore and remote region may be caused by different contributing sources.The high TC concentration in the nearshore is mainly derived from biomass burning and motor vehicle exhaust.In contrast,the TC in the remote region may be associated with a relatively high proportion of SOA formation.

关 键 词：西北太平洋 总碳 δ13C 大陆 海洋气溶胶 

分 类 号：X51[环境科学与工程—环境工程] X831