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An advanced impact of Arctic stratospheric ozone changes on spring precipitation in China

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Abstract

The effect of spring Arctic Stratospheric Ozone (ASO) changes on spring precipitation in China is analyzed using observations, reanalysis data, and the Whole Atmosphere Community Climate Model version 4 (WACCM4). We find that February–March mean ASO changes have a significant impact on April–May mean precipitation over Loess Plateau and middle–lower reaches of the Yangtze River—two important grain-producing regions with large populations. Changes in the polar vortex link the ASO to precipitation in China. Stratospheric circulation anomalies caused by ASO changes can propagate to the North Pacific. An increase in ASO leads to enhanced westerlies in the high and low latitudes of the North Pacific but weakened westerly in the mid-latitudes of the North Pacific. The circulation anomalies over the North Pacific, forced by the increase of ASO, can extend westwards to East Asia, leading to an abnormal anticyclone in the East Asian upper and middle troposphere, and an abnormal cyclone in the lower troposphere. This enhances the warm and humid airstream from Western Pacific to Chinese mainland and strengthens upwelling over Loess Plateau and middle–lower reaches of the Yangtze River. These conditions enhance precipitation in central China during positive ASO anomaly events and reduce precipitation during negative events. The WACCM4 simulations support the results from statistical analysis of observations and reanalysis data. Our results suggest that ASO variation can serve as a predictor of spring precipitation variation over Loess Plateau and middle–lower reaches of the Yangtze River.

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Acknowledgements

Funding for this project was provided by the National Natural Science Foundation of China (41790474, 41530423, and 41575039). We acknowledge ozone datasets from the SWOOSH and GOZCARDS; precipitation from China Meteorological Administration, GPCC and GPCP; Meteorological fields from NCEP2.

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Correspondence to Xuan Ma.

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This paper is a contribution to the special issue on East Asian Climate under Global Warming: Understanding and Projection, consisting of papers from the East Asian Climate (EAC) community and the 13th EAC International Workshop in Beijing, China on 24–25 March 2016, and coordinated by Jianping Li, Huang-Hsiung Hsu, Wei-Chyung Wang, Kyung-Ja Ha, Tim Li, and Akio Kitoh.

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Xie, F., Ma, X., Li, J. et al. An advanced impact of Arctic stratospheric ozone changes on spring precipitation in China. Clim Dyn 51, 4029–4041 (2018). https://doi.org/10.1007/s00382-018-4402-1

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  • DOI: https://doi.org/10.1007/s00382-018-4402-1

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