气候变化领域集成服务门户(CCPortal): Indicators of Antarctic ozone depletion: 1979 to 2019

CCPortal

DOI	10.5194/acp-21-5289-2021
	Indicators of Antarctic ozone depletion: 1979 to 2019
	Bodeker G.E.; Kremser S.
发表日期	2021
ISSN	1680-7316
起始页码	5289
结束页码	5300
卷号	21 期号:7
英文摘要	The National Institute of Water and Atmospheric Research/Bodeker Scientific (NIWA-BS) total column ozone (TCO) database and the associated BS-filled TCO database have been updated to cover the period 1979 to 2019, bringing both to version 3.5.1 (V3.5.1). The BSfilled database builds on the NIWA-BS database by using a machine-learning algorithm to fill spatial and temporal data gaps to provide gap-free TCO fields over Antarctica. These filled TCO fields then provide a more complete picture of wintertime changes in the ozone layer over Antarctica. The BS-filled database has been used to calculate continuous, homogeneous time series of indicators of Antarctic ozone depletion from 1979 to 2019, including (i) daily values of the ozone mass deficit based on TCO below a 220DU threshold; (ii) daily measures of the area over Antarctica where TCO levels are below 150 DU, below 220 DU, more than 30% below 1979 to 1981 climatological means, and more than 50% below 1979 to 1981 climatological means; (iii) the date of disappearance of 150DU TCO values, 220DU TCO values, values 30% or more below 1979 to 1981 climatological means, and values 50% or more below 1979 to 1981 climatological means, for each year; and (iv) daily minimum TCO values over the range 75 to 90 S equivalent latitude. Since both the NIWA-BS and BS-filled databases provide uncertainties on every TCO value, the Antarctic ozone depletion metrics are provided, for the first time, with fully traceable uncertainties. To gain insight into how the vertical distribution of ozone over Antarctica has changed over the past 36 years, ozone concentrations, combined and homogenized from several satellite-based ozone monitoring instruments as well as the global ozonesonde network, were also analysed. A robust attribution to changes in the drivers of long-Term secular variability in these metrics has not been performed in this analysis. As a result, statements about the recovery of Antarctic TCO from the effects of ozone-depleting substances cannot be made. That said, there are clear indications of a change in trend in many of the metrics reported on here around the turn of the century, close to when Antarctic stratospheric concentrations of chlorine and bromine peaked. © 2020 EDP Sciences. All rights reserved.
语种	英语
scopus关键词	algorithm; database; machine learning; ozone depletion; time series; total ozone; vertical distribution; Antarctica
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/246998
作者单位	Bodeker Scientific, 42 Russell Street, Alexandra, 9320, New Zealand; School of Geography Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand
推荐引用方式 GB/T 7714	Bodeker G.E.,Kremser S.. Indicators of Antarctic ozone depletion: 1979 to 2019[J],2021,21(7).
APA	Bodeker G.E.,&Kremser S..(2021).Indicators of Antarctic ozone depletion: 1979 to 2019.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(7).
MLA	Bodeker G.E.,et al."Indicators of Antarctic ozone depletion: 1979 to 2019".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.7(2021).