气候变化领域集成服务门户(CCPortal): Mechanisms Linked to Recent Ozone Decreases in the Northern Hemisphere Lower Stratosphere

CCPortal

DOI	10.1029/2019JD031631
	Mechanisms Linked to Recent Ozone Decreases in the Northern Hemisphere Lower Stratosphere
	Orbe C.; Wargan K.; Pawson S.; Oman L.D.
发表日期	2020
ISSN	2169897X
卷号	125 期号:9
英文摘要	Previous studies have robustly identified a decrease since 1998 in lower stratospheric (LS) ozone in the Northern Hemisphere (NH). While this ozone decrease is qualitatively explained as resulting from changes in the large-scale circulation, there is not yet a quantitative mechanistic explanation of these changes. Here, we explore the drivers of recent ozone changes using two different configurations of the Goddard Earth Observing System (GEOS) general circulation model. The first configuration of GEOS includes a full chemistry module and is constrained with meteorological fields from the Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2). This configuration (M2GMI) is used to analyze an idealized tracer that covaries closely with ozone on interannual and decadal timescales, revealing that recent ozone decreases in the NH subtropics are associated with a poleward expansion of upwelling in the NH LS, with reduced (enhanced) downwelling over northern subtropics (midlatitudes). The second configuration of GEOS is a free-running version of the GEOS Chemistry Climate Model (CCM) that is used to perform a 10-member ensemble of free-running simulations. Comparisons of the two configurations reveal that, while the free-running model can produce negative ozone changes in the NH LS, the magnitude of these changes is significantly weaker, relative to both M2GMI and MERRA-2; moreover, these weaker ozone decreases are consistent with weaker simulated changes in the residual circulation. Finally, we examine the GEOS model results in the broader context of the hindcast simulations performed as part of Phase 1 of the Chemistry Climate Modeling Initiative. We show that the majority of the free-running simulations considered here also exhibit weaker long-term residual circulation changes, compared to reanalyses. Published 2020. This article is a US Government work and is in the public domain in the USA.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186021
作者单位	NASA Goddard Institute for Space Studies, New York, NY, United States; Science Systems and Applications, Inc., Lanham, MD, United States; Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Orbe C.,Wargan K.,Pawson S.,et al. Mechanisms Linked to Recent Ozone Decreases in the Northern Hemisphere Lower Stratosphere[J],2020,125(9).
APA	Orbe C.,Wargan K.,Pawson S.,&Oman L.D..(2020).Mechanisms Linked to Recent Ozone Decreases in the Northern Hemisphere Lower Stratosphere.Journal of Geophysical Research: Atmospheres,125(9).
MLA	Orbe C.,et al."Mechanisms Linked to Recent Ozone Decreases in the Northern Hemisphere Lower Stratosphere".Journal of Geophysical Research: Atmospheres 125.9(2020).