气候变化领域集成服务门户(CCPortal): Analysis and attribution of total column ozone changes over the Tibetan Plateau during 1979-2017

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DOI	10.5194/acp-20-8627-2020
	Analysis and attribution of total column ozone changes over the Tibetan Plateau during 1979-2017
	Li Y.; Chipperfield M.P.; Feng W.; Dhomse S.S.; Pope R.J.; Li F.; Guo D.
发表日期	2020
ISSN	1680-7316
起始页码	8627
结束页码	8639
卷号	20 期号:14
英文摘要	Various observation-based datasets have confirmed positive zonal mean column ozone trends at midlatitudes as a result of the successful implementation of the Montreal Protocol. However, there is still uncertainty about the longitudinal variation of these trends and the direction and magnitude of ozone changes at low latitudes. Here, we use the extended Copernicus Climate Change Service (C3S) dataset (1979-2017) to investigate the long-term variations in total column ozone (TCO) over the Tibetan Plateau (TP) for different seasons. We use piecewise linear trend (PWLT) and equivalent effective stratospheric chlorine loading (EESC)-based multivariate regression models with various proxies to attribute the influence of dynamical and chemical processes on the TCO variability. We also compare the seasonal behaviour of the relative total ozone low (TOL) over the TP with the zonal mean at the same latitude. Both regression models show that the TP column ozone trends change from negative trends from 1979 to 1996 to small positive trends from 1997 to 2017, although the later positive trend based on PWLT is not statistically significant. The wintertime positive trend starting from 1997 is larger than that in summer, but both seasonal TP recovery rates are smaller than the zonal means over the same latitude band. For TP column ozone, both regression models suggest that the geopotential height at 150 hPa (GH150) is a more suitable and realistic dynamical proxy compared to a surface temperature proxy used in some previous studies. Our analysis also shows that the wintertime GH150 plays an important role in determining summertime TCO over the TP through persistence of the ozone signal. For the zonal mean column ozone at this latitude, the quasi-biennial oscillation (QBO) is nonetheless the dominant dynamical proxy. We also use a 3-D chemical transport model to diagnose the contributions of different proxies for the TP region. The role of GH150 variability is illustrated by using two sensitivity experiments with repeating dynamics of 2004 and 2008. The simulated ozone profiles clearly show that wintertime TP ozone concentrations are largely controlled by tropics to midlatitude pathways, whereas in summer variations associated with tropical processes play an important role. These model results confirm that the long-term trends of TCO over the TP are dominated by different processes in winter and summer. The different TP recovery rates relative to the zonal means at the same latitude band are largely determined by wintertime dynamical processes. © 2020 Author(s).
语种	英语
scopus关键词	climate change; data set; multivariate analysis; ozone; quasi-biennial oscillation; stratosphere; China; Qinghai-Xizang Plateau
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/141203
作者单位	School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, China; 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; Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China; Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China
推荐引用方式 GB/T 7714	Li Y.,Chipperfield M.P.,Feng W.,et al. Analysis and attribution of total column ozone changes over the Tibetan Plateau during 1979-2017[J],2020,20(14).
APA	Li Y..,Chipperfield M.P..,Feng W..,Dhomse S.S..,Pope R.J..,...&Guo D..(2020).Analysis and attribution of total column ozone changes over the Tibetan Plateau during 1979-2017.Atmospheric Chemistry and Physics,20(14).
MLA	Li Y.,et al."Analysis and attribution of total column ozone changes over the Tibetan Plateau during 1979-2017".Atmospheric Chemistry and Physics 20.14(2020).