Indicators of Antarctic ozone depletion: 1979 to 2019
Indicators of Antarctic ozone depletion: 1979 to 2019
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DOI：
10.5194/acp-21-5289-2021
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发表时间：
2021-04-06
影响因子：
6.3
通讯作者：
Kremser, Stefanie
中科院分区：
文献类型：
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作者：
Bodeker, Greg E.;Kremser, Stefanie
国家水和大气研究所/博德克科学（NIWA-BS）的总柱臭氧（TCO）数据库和相关的BS填充TCO数据库已经更新，涵盖1979年至2019年期间，使两者都达到3.5.1版本（V3.5.1）。BS填充数据库建立在NIWA-BS数据库的基础上，使用机器学习算法填补空间和时间数据空白，以提供南极洲上空无空白的TCO字段。这些填充的TCO字段，然后提供了一个更完整的图片冬季在南极洲上空的臭氧层的变化。已使用由BS填充的数据库计算了1979年至2019年期间南极臭氧消耗指标的连续、均匀时间序列，包括：（一）根据低于220 DU阈值的TCO计算的臭氧质量亏损日值; ㈡南极洲上空TCO水平低于150 DU、低于220 DU、比1979年至1981年气候平均值低30%以上的地区的每日测量值，（iii）每年有150个贫铀总含量值、220个贫铀总含量值、比1979至1981年的气候平均值低30%或以上的值及比1979至1981年的气候平均值低50%或以上的值消失的日期;及（iv）相当于南纬75至90度范围内的每日最低TCO值。由于NIWA-BS和BS填充的数据库都提供了关于每一个TCO值的不确定性，南极臭氧消耗度量首次提供了完全可追踪的不确定性。为了深入了解过去36年来南极上空臭氧垂直分布的变化情况，还分析了从若干卫星臭氧监测仪器以及全球臭氧探测仪网络得到的合并和均质化的臭氧浓度。在本分析中，尚未对这些指标的长期长期变化的驱动因素的变化进行强有力的归因。因此，无法做出有关南极总拥有成本从臭氧消耗物质影响中恢复的声明。尽管如此，有明确的迹象表明，在世纪之交，接近南极平流层氯和溴浓度达到峰值时，这里报告的许多指标的趋势发生了变化。
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 BS-filled 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 220 DU 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 150 DU TCO values, 220 DU 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 degrees 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.