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DOI	10.5194/acp-19-767-2019
	Dynamically controlled ozone decline in the tropical mid-stratosphere observed by SCIAMACHY
	Galytska E.; Rozanov A.; Chipperfield M.P.; Dhomse S.S.; Weber M.; Arosio C.; Feng W.; Burrows J.P.
发表日期	2019
ISSN	16807316
起始页码	767
结束页码	783
卷号	19 期号:2
英文摘要	Despite the recently reported beginning of a recovery in global stratospheric ozone (O 3 ), an unexpected O 3 decline in the tropical mid-stratosphere (around 30-35 km altitude) was observed in satellite measurements during the first decade of the 21st century. We use SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) measurements for the period 2004-2012 to confirm the significant O 3 decline. The SCIAMACHY observations show that the decrease in O 3 is accompanied by an increase in NO 2 . To reveal the causes of these observed O 3 and NO 2 changes, we performed simulations with the TOMCAT 3- D chemistry-transport model (CTM) using different chemical and dynamical forcings. For the 2004-2012 time period, the TOMCAT simulations reproduce the SCIAMACHYobserved O 3 decrease and NO 2 increase in the tropical mid-stratosphere. The simulations suggest that the positive changes in NO 2 (around 7%decade-1) are due to similar positive changes in reactive odd nitrogen (NO y ), which are a result of a longer residence time of the source gas N 2 O and increased production via N 2 O+ O(1D). The model simulations show a negative change of 10%decade-1 in N 2 O that is most likely due to variations in the deep branch of the Brewer-Dobson Circulation (BDC). Interestingly, modelled annual mean "age of air" (AoA) does not show any significant changes in transport in the tropical mid-stratosphere during 2004-2012. However, further analysis of model results demonstrates significant seasonal variations. During the autumn months (September-October) there are positive AoA changes that imply transport slowdown and a longer residence time of N 2 O allowing for more conversion to NO y , which enhances O 3 loss. During winter months (January-February) there are negative AoA changes, indicating faster N 2 O transport and less NO y production. Although the variations in AoA over a year result in a statistically insignificant linear change, nonlinearities in the chemistry-transport interactions lead to a statistically significant negative N 2 O change. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric dynamics; atmospheric transport; computer simulation; numerical model; ozone; SCIAMACHY; seasonal variation; stratosphere
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/144708
作者单位	Institute of Environmental Physics, University of Bremen, Bremen, Germany; Department of Meteorology and Climatology, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; National Centre for Earth Observation, University of Leeds, Leeds, United Kingdom; National Centre for Atmospheric Science, University of Leeds, Leeds, United Kingdom
推荐引用方式 GB/T 7714	Galytska E.,Rozanov A.,Chipperfield M.P.,et al. Dynamically controlled ozone decline in the tropical mid-stratosphere observed by SCIAMACHY[J],2019,19(2).
APA	Galytska E..,Rozanov A..,Chipperfield M.P..,Dhomse S.S..,Weber M..,...&Burrows J.P..(2019).Dynamically controlled ozone decline in the tropical mid-stratosphere observed by SCIAMACHY.Atmospheric Chemistry and Physics,19(2).
MLA	Galytska E.,et al."Dynamically controlled ozone decline in the tropical mid-stratosphere observed by SCIAMACHY".Atmospheric Chemistry and Physics 19.2(2019).