Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-757
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
21 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Increasing persistent hazes in Beijing: potential impacts of weakening East Asian Winter Monsoons associated with northwestern Pacific SST trend since 1900
Lin Pei1, Zhongwei Yan2, Zhaobin Sun1, Shiguang Miao1, and Yao Yao2 1Institute of Urban Meteorology, China Meteorological Administration, Beijing, China
2RCE-TEA, Institute of Atmospheric Physics, University of Chinese Academy of Sciences, Beijing, China
Abstract. This paper analyzes the variations of persistent haze days in boreal winter in Beijing and demonstrates a significant increasing trend with increasing probability of the persistent haze events (PHEs) during 1980–2016. The atmospheric conditions favorable for the increasing PHEs include reduced surface meridional winds and weakened East Asian Trough in the mid-troposphere. These conditions indicate a weakening East Asian Winter Monsoon (EAWM) system, which is then found to be associated with an anomalous warm and high-pressure system in the mid-lower troposphere over the northwestern Pacific. We proposed a practical circulation indicator using the anomalous southerly winds at 850 hPa over North China. The increasing occurrence of the persistent haze days in Beijing is closely related with increasing frequencies of unusual persistent southerly episodes in recent decades. Over the past centennial period 1900–2009, the anomalous meridional winds at 850 hPa in North China were positively correlated with the sea surface temperature anomalies over the northwestern Pacific. Based on the present results, we outline an observation-based mechanism highlighting the role of large scale climate warming on the increasing trend of PHEs in Beijing.

Citation: Pei, L., Yan, Z., Sun, Z., Miao, S., and Yao, Y.: Increasing persistent hazes in Beijing: potential impacts of weakening East Asian Winter Monsoons associated with northwestern Pacific SST trend since 1900, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-757, in review, 2017.
Lin Pei et al.
Lin Pei et al.
Lin Pei et al.

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Short summary
This paper demonstrated the increasing frequency of persistent haze events (PHEs) in Beijing based on updated observations and the associated changes in large-scale atmospheric circulations with possible link to the large-scale centennial warming trend. We proposed a more concrete observation-based mechanism for explaining how the local PHEs in Beijing change with large-scale climate warming via a link of SSTA in the northwestern Pacific.
This paper demonstrated the increasing frequency of persistent haze events (PHEs) in Beijing...
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