气候变化领域集成服务门户(CCPortal): Impact of biomass burning and stratospheric intrusions in the remote South Pacific Ocean troposphere

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DOI	10.5194/acp-22-4075-2022
	Impact of biomass burning and stratospheric intrusions in the remote South Pacific Ocean troposphere
	Daskalakis, Nikos; Gallardo, Laura; Kanakidou, Maria; Nuess, Johann Rasmus; Menares, Camilo; Rondanelli, Roberto; Thompson, Anne M.; Vrekoussis, Mihalis
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	4075
结束页码	4099
卷号	22 期号:6 页码:25
英文摘要	The ozone mixing ratio spatiotemporal variability in the pristine South Pacific Ocean is studied, for the first time, using 21-year-long ozone (O-3) records from the entire southern tropical and subtropical Pacific between 1994 and 2014. The analysis considered regional O-3 vertical observations from ozonesondes, surface carbon monoxide (CO) observations from flasks, and three-dimensional chemistry-transport model simulations of the global troposphere. Two 21-year-long numerical simulations, with and without biomass burning emissions, were performed to disentangle the importance of biomass burning relative to stratospheric intrusions for ambient ozone levels in the region. Tagged tracers of O-3 from the stratosphere and CO from various biomass burning regions have been used to track the impact of these different regions on the southern tropical Pacific O-3 and CO levels. Patterns have been analyzed based on atmospheric dynamics variability. Considering the interannual variability in the observations, the model can capture the observed ozone gradients in the troposphere with a positive bias of 7.5 % in the upper troposphere/lower stratosphere (UTLS) as well as near the surface. Remarkably, even the most pristine region of the global ocean is affected by distant biomass burning emissions by convective outflow through the mid and high troposphere and subsequent subsidence over the pristine oceanic region. Therefore, the biomass burning contribution to tropospheric CO levels maximizes in the UTLS. The Southeast Asian open fires have been identified as the major contributing source to CO from biomass burning in the tropical South Pacific, contributing on average for the study period about 8.5 and 13 ppbv of CO at Rapa Nui and Samoa, respectively, at an altitude of around 12 km during the burning season in the spring of the Southern Hemisphere. South America is the second-most important biomass burning source region that influences the study area. Its impact maximizes in the lower troposphere (6.5 ppbv for Rapa Nui and 3.8 ppbv for Samoa). All biomass burning sources contribute about 15-23 ppbv of CO at Rapa Nui and Samoa and account for about 25 % of the total CO in the entire troposphere of the tropical and subtropical South Pacific. This impact is also seen on tropospheric O-3, to which biomass burning O-3 recursor emissions contribute only a few ppbv during the burning period, while the stratosphere-troposphere exchange is the most important source of O-3 for the mid troposphere of the South Pacific Ocean, contributing about 15-20 ppbv in the subtropics.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000776488600001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273051
作者单位	University of Bremen; Universidad de Chile; Universidad de Chile; University of Crete; Foundation for Research & Technology - Hellas (FORTH); Institute of Chemical Engineering Sciences (ICE-HT); National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; University of Bremen
推荐引用方式 GB/T 7714	Daskalakis, Nikos,Gallardo, Laura,Kanakidou, Maria,et al. Impact of biomass burning and stratospheric intrusions in the remote South Pacific Ocean troposphere[J],2022,22(6):25.
APA	Daskalakis, Nikos.,Gallardo, Laura.,Kanakidou, Maria.,Nuess, Johann Rasmus.,Menares, Camilo.,...&Vrekoussis, Mihalis.(2022).Impact of biomass burning and stratospheric intrusions in the remote South Pacific Ocean troposphere.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(6),25.
MLA	Daskalakis, Nikos,et al."Impact of biomass burning and stratospheric intrusions in the remote South Pacific Ocean troposphere".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.6(2022):25.