气候变化领域集成服务门户(CCPortal): Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe

CCPortal

DOI	10.5194/acp-22-6151-2022
	Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe
	Nussbaumer, Clara M.; Pozzer, Andrea; Tadic, Ivan; Roeder, Lenard; Obersteiner, Florian; Harder, Hartwig; Lelieveld, Jos; Fischer, Horst
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	6151
结束页码	6165
卷号	22 期号:9 页码:15
英文摘要	The COVID-19 (coronavirus disease 2019) European lockdowns have led to a significant reduction in the emissions of primary pollutants such as NO (nitric oxide) and NO2 (nitrogen dioxide). As most photochemical processes are related to nitrogen oxide (NO, NO + NO2) chemistry, this event has presented an exceptional opportunity to investigate its effects on air quality and secondary pollutants, such as tropospheric ozone (O-3). In this study, we present the effects of the COVID-19 lockdown on atmospheric trace gas concentrations, net ozone production rates (NOPRs) and the dominant chemical regime throughout the troposphere based on three different research aircraft campaigns across Europe. These are the UTOPIHAN (Upper Tropospheric Ozone: Processes Involving HOx and NOx) campaigns in 2003 and 2004, the HOOVER (HOx over Europe) campaigns in 2006 and 2007, and the BLUESKY campaign in 2020, the latter performed during the COVID-19 lockdown. We present in situ observations and simulation results from the ECHAM5 (fifth-generation European Centre Hamburg general circulation model, version 5.3.02)/MESSy2 (second-generation Modular Earth Submodel System, version 2.54.0) Atmospheric Chemistry (EMAC), model which allows for scenario calculations with business-as-usual emissions during the BLUESKY campaign, referred to as the no-lockdown scenario. We show that the COVID-19 lockdown reduced NO and NO2 mixing ratios in the upper troposphere by around 55 % compared to the no-lockdown scenario due to reduced air traffic. O-3 production and loss terms reflected this reduction with a deceleration in O-3 cycling due to reduced mixing ratios of NOx, while NOPRs were largely unaffected. We also study the role of methyl peroxyradicals forming HCHO (alpha CH3O2) to show that the COVID-19 lockdown shifted the chemistry in the upper-troposphere-tropopause region to a NOx-limited regime during BLUESKY. In comparison, we find a volatile organic compound (VOC)-limited regime to be dominant during UTOPIHAN.
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:000793188500001
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/273261
作者单位	Max Planck Society; Helmholtz Association; Karlsruhe Institute of Technology
推荐引用方式 GB/T 7714	Nussbaumer, Clara M.,Pozzer, Andrea,Tadic, Ivan,et al. Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe[J],2022,22(9):15.
APA	Nussbaumer, Clara M..,Pozzer, Andrea.,Tadic, Ivan.,Roeder, Lenard.,Obersteiner, Florian.,...&Fischer, Horst.(2022).Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(9),15.
MLA	Nussbaumer, Clara M.,et al."Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.9(2022):15.