气候变化领域集成服务门户(CCPortal): Observational evidence of energetic particle precipitation NOx (EPP-NOx) interaction with chlorine curbing Antarctic ozone loss

CCPortal

DOI	10.5194/acp-21-2819-2021
	Observational evidence of energetic particle precipitation NOx (EPP-NOx) interaction with chlorine curbing Antarctic ozone loss
	Gordon E.M.; Seppälä A.; Funke B.; Tamminen J.; Walker K.A.
发表日期	2021
ISSN	1680-7316
起始页码	2819
结束页码	2836
卷号	21 期号:4
英文摘要	We investigate the impact of the so-called energetic particle precipitation (EPP) indirect effect on lower stratospheric ozone, ClO, and ClONO2 in the Antarctic springtime. We use observations from the Microwave Limb Sounder (MLS) and Ozone Monitoring Instrument (OMI) on Aura, the Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) on SCISAT, and the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat, covering the period from 2005 to 2017. Using the geomagnetic activity index Ap as a proxy for EPP, we find consistent ozone increases with elevated EPP during years with an easterly phase of the quasi-biennial oscillation (QBO) in both OMI and MLS observations. While these increases are the opposite of what has previously been reported at higher altitudes, the pattern in the MLS O3 follows the typical descent patterns of EPP-NOx . The ozone enhancements are also present in the OMI total O3 column observations. Analogous to the descent patterns found in O3, we also found consistent decreases in springtime MLS ClO following winters with elevated EPP. To verify if this is due to a previously proposed mechanism involving the conversion of ClO to the reservoir species ClONO2 in reaction with NO2, we used ClONO2 observations from ACE-FTS and MIPAS. As ClO and NO2 are both catalysts in ozone destruction, the conversion to ClONO2 would result in an ozone increase. We find a positive correlation between EPP and ClONO2 in the upper stratosphere in the early spring and in the lower stratosphere in late spring, providing the first observational evidence supporting the previously proposed mechanism relating to EPP-NOx modulating Clx-driven ozone loss. Our findings suggest that EPP has played an important role in modulating ozone depletion in the last 15 years. As chlorine loading in the polar stratosphere continues to decrease in the future, this buffering mechanism will become less effective, and catalytic ozone destruction by EPP-NOx will likely become a major contributor to Antarctic ozone loss. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
语种	英语
scopus关键词	atmospheric chemistry; chlorine; concentration (composition); nitrogen oxides; ozone; seasonal variation
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/247116
作者单位	Department of Physics, University of Otago, Dunedin, New Zealand; Instituto de Astrofísica de Andalucía, Granada, Spain; Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland; Department of Physics, University of Toronto, Toronto, Canada
推荐引用方式 GB/T 7714	Gordon E.M.,Seppälä A.,Funke B.,et al. Observational evidence of energetic particle precipitation NOx (EPP-NOx) interaction with chlorine curbing Antarctic ozone loss[J],2021,21(4).
APA	Gordon E.M.,Seppälä A.,Funke B.,Tamminen J.,&Walker K.A..(2021).Observational evidence of energetic particle precipitation NOx (EPP-NOx) interaction with chlorine curbing Antarctic ozone loss.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Gordon E.M.,et al."Observational evidence of energetic particle precipitation NOx (EPP-NOx) interaction with chlorine curbing Antarctic ozone loss".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).