气候变化领域集成服务门户(CCPortal): Seasonal impact of biogenic very short-lived bromocarbons on lowermost stratospheric ozone between 60° N and 60° S during the 21st century

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DOI	10.5194/acp-20-8083-2020
	Seasonal impact of biogenic very short-lived bromocarbons on lowermost stratospheric ozone between 60° N and 60° S during the 21st century
	Alejandro Barrera J.; Pedro Fernandez R.; Iglesias-Suarez F.; Alberto Cuevas C.; Lamarque J.F.; Saiz-Lopez A.
发表日期	2020
ISSN	16807316
起始页码	8083
结束页码	8102
卷号	20 期号:13
英文摘要	Biogenic very short-lived bromocarbons (VSLBr) currently represent 25% of the total stratospheric bromine loading. Owing to their much shorter lifetime compared to anthropogenic long-lived bromine (e.g. halons) and chlorine (e.g. chlorofluorocarbons), the impact of VSLBr on ozone peaks in the lowermost stratosphere, which is a key climatic and radiative atmospheric region. Here we present a modelling study of the evolution of stratospheric ozone and its chemical loss within the tropics and at mid-latitudes during the 21st century. Two different experiments are explored: considering and neglecting the additional stratospheric injection of 5 ppt biogenic bromine naturally released from the ocean. Our analysis shows that the inclusion of VSLBr results in a realistic stratospheric bromine loading and improves the agreement between the model and satellite observations of the total ozone column (TOC) for the 1980 2015 period at mid-latitudes. We show that the overall ozone response to VSLBr at mid-latitudes follows the stratospheric evolution of long-lived inorganic chlorine and bromine throughout the 21st century. Additional ozone loss due to VSLBr is maximized during the present-day period (1990 2010), with TOC differences of 8DU (3 %) and 5:5DU (2 %) for the Southern Hemisphere and Northern Hemisphere midlatitudes (SH-MLs and NH-MLs), respectively. Moreover, the projected TOC differences at the end of the 21st century are 50% lower than the values found for the present-day period. We find that seasonal VSLBr impact on lowermost stratospheric ozone at mid-latitude is influenced by the seasonality of the heterogeneous inorganic-chlorine reactivation processes on ice crystals. Indeed, due to the more efficient reactivation of chlorine reservoirs (mainly ClONO2 and HCl) within the colder SH-ML lowermost stratosphere, the seasonal VSLBr impact shows a small but persistent hemispheric asymmetry through the whole modelled period. Our results indicate that, although the overall VSLBr-driven ozone destruction is greatest during spring, the halogen-mediated (Halogx-Loss) ozone loss cycle in the mid-latitude lowermost stratosphere during winter is comparatively more efficient than the HOx cycle with respect to other seasons. Indeed, when VSLBr are considered, Halogx-Loss dominates wintertime lowermost stratospheric ozone loss at SH-MLs between 1985 and 2020, with a contribution of inter-halogen ClOx BrOx cycles to Halogx-Loss of 50 %. Within the tropics, a small (2:5 DU) and relatively constant (1 %) ozone depletion mediated by VSLBr is closely related to their fixed emissions throughout the modelled period. By including the VSLBr sources, the seasonal Halogx-Loss contribution to lowermost stratospheric ozone loss is practically dominated by the BrOx cycle, reflecting the low sensitivity of very short-lived (VSL) bromine to background halogen abundances to drive tropical stratospheric ozone depletion. We conclude that the link between biogenic bromine sources and seasonal changes in heterogeneous chlorine reactivation is a key feature for future projections of mid-latitude lowermost stratospheric ozone during the 21st century. © 2020 American Society of Civil Engineers (ASCE). All rights reserved.
语种	英语
scopus关键词	atmospheric chemistry; biogenic emission; bromine; chloride; ozone depletion; seasonal variation; stratosphere; total ozone; twenty first century
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/143940
作者单位	Institute for Interdisciplinary Science, National Research Council (ICB-CONICET), FCEN-UNCuyo, Mendoza, 5500, Argentina; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, Csic, Madrid, 28006, Spain; Atmospheric and Environmental Studies Group (GEAA), UTN-FRM, Mendoza, 5500, Argentina; Atmospheric Chemistry, ObservationsĝandĝModelling Laboratory, National Center for Atmospheric Research, Boulder, CO 80301, United States
推荐引用方式 GB/T 7714	Alejandro Barrera J.,Pedro Fernandez R.,Iglesias-Suarez F.,et al. Seasonal impact of biogenic very short-lived bromocarbons on lowermost stratospheric ozone between 60° N and 60° S during the 21st century[J],2020,20(13).
APA	Alejandro Barrera J.,Pedro Fernandez R.,Iglesias-Suarez F.,Alberto Cuevas C.,Lamarque J.F.,&Saiz-Lopez A..(2020).Seasonal impact of biogenic very short-lived bromocarbons on lowermost stratospheric ozone between 60° N and 60° S during the 21st century.Atmospheric Chemistry and Physics,20(13).
MLA	Alejandro Barrera J.,et al."Seasonal impact of biogenic very short-lived bromocarbons on lowermost stratospheric ozone between 60° N and 60° S during the 21st century".Atmospheric Chemistry and Physics 20.13(2020).