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Discussion papers
https://doi.org/10.5194/acp-2019-710
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-710
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Nov 2019

Submitted as: research article | 13 Nov 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Decreases in wintertime total column ozone over the Tibetan Plateau during 1979–2017

Yajuan Li1,2, Martyn P. Chipperfield2,3, Wuhu Feng2,4, Sandip S. Dhomse2,3, Richard J. Pope2,3, Faquan Li5, and Dong Guo6 Yajuan Li et al.
  • 1School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, China
  • 2School of Earth and Environment, University of Leeds, Leeds, UK
  • 3National Centre for Earth Observation, University of Leeds, Leeds, UK
  • 4National Centre for Atmospheric Science, University of Leeds, UK
  • 5Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China
  • 6Key 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 & Technology, Nanjing, China

Abstract. We use the ozone dataset from the Copernicus Climate Change Service (C3S) during 1979–2017 to investigate the long-term variations of the total column ozone (TCO) and the relative total ozone low (TOL) over the Tibetan Plateau (TP) during different seasons. Based on various regression models, the wintertime TCO over the TP decreases overall during 1979–2017 with ongoing decreases since 1997. We perform multivariate regression analysis to quantify the influence of dynamical and chemical processes responsible for the long-term TCO variability over the TP. We use both piecewise linear trend (PWLT) and equivalent effective stratospheric chlorine loading (EESC)-based regression models that include explanatory variables such as the 11-year solar cycle, quasi-biennial oscillation (QBO) at 30 hPa and 10 hPa and the geopotential height (GH) at 150 hPa. The 150 hPa GH is found to be a major dynamical contributor to the total ozone variability (8 %) over the TP in wintertime. We also find strong correlation between TCO in DJF and the following JJA, indicating that negative/positive anomalies in the wintertime build up persist into summer. We also use the TOMCAT/SLIMCAT 3-D chemical transport model to investigate the contributions of different factors to the ozone variations over the TP. Using identical regression model on simulated TCO time series, we obtain consistent results with C3S-based data. We perform two sensitivity experiments with repeating dynamics of 2004 and 2008 to further study the role that the GH at 150 hPa plays in the ozone variations over the TP. The GH differences between the two years show an obvious, negative centre near 150 hPa over the TP in DJF. Composite analysis show that GH fluctuations associated with Inter Tropical Convergence Zone, ENSO events or Walker circulation play a key role in controlling TCO variability in the lower stratosphere.

Yajuan Li et al.
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Short summary
The Tibetan Plateau (TP) exerts important thermal and dynamical effects on atmospheric circulation, climate change as well as the ozone distribution. In this study, we use updated observations and model simulations to investigate the ozone trends and variations over the TP. We find the wintertime total column ozone over the TP decreased overall during 1979–2017. The dynamical transport dominates during wintertime ozone buildup and persists but decays in the subsequent summertime.
The Tibetan Plateau (TP) exerts important thermal and dynamical effects on atmospheric...
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