Preprints
https://doi.org/10.5194/acp-2021-166
https://doi.org/10.5194/acp-2021-166

  30 Mar 2021

30 Mar 2021

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Intensified modulation of aerosol pollution in China by El Niño with short duration

Liangying Zeng1, Yang Yang1, Hailong Wang2, Jing Wang3, Jing Li4, Lili Ren1, Huimin Li1, Yang Zhou1, Pinya Wang1, and Hong Liao1 Liangying Zeng et al.
  • 1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
  • 2Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington, USA
  • 3Tianjin Key Laboratory for Oceanic Meteorology, Tianjin Institute of Meteorological Science, Tianjin, China
  • 4Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China

Abstract. El Niño-Southern Oscillation (ENSO), a phenomenon of periodic changes in sea surface temperature in the equatorial central eastern Pacific Ocean, is the strongest signal of interannual variability in the climate system with a quasi-period of 2–7 years. El Niño events have been shown to have important influences on meteorological conditions in China. In this study, the impacts of El Niño with different durations on aerosol concentrations and haze days during December-January-February (DJF) in China are quantitatively examined using the state-of-the-science Energy Exascale Earth System Model version 1 (E3SMv1). We find that PM2.5 concentrations are increased by 1–2 µg m−3 in the northeastern and southern China and decreased by up to 2.4 µg m−3 in central-eastern China during El Niño events relative to the climatological means. Compared to long duration (LD) El Niño events, El Niño with short duration (SD) but strong intensity causes northerly wind anomalies over central-eastern China, which is favorable for aerosol dispersion over this region. Moreover, the anomalous southeasterly winds weaken the wintertime prevailing northwesterly in northeastern China and facilitate aerosol transport from South and Southeast Asia, enhancing aerosol increase in northeastern China during SD El Niño events relative to LD El Niño events. In addition, the modulation on haze days by SD El Niño events is 2–3 times more than that by LD El Niño events in China. The aerosol variations during El Niño events are mainly controlled by anomalous aerosol accumulation/dispersion and transport due to changes in atmospheric circulation, while El Niño-induced precipitation change has little effect. The occurrence frequency of SD El Niño events has been increasing significantly in recent decades, especially after 1940s, suggesting that El Niño with short duration have exerted increasingly intense modulation on aerosol pollution in China over the past few decades.

Liangying Zeng et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-166', Anonymous Referee #1, 27 Apr 2021
  • RC2: 'Comment on acp-2021-166', Anonymous Referee #2, 28 Apr 2021
  • RC3: 'Comment on acp-2021-166', Anonymous Referee #3, 13 May 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-166', Anonymous Referee #1, 27 Apr 2021
  • RC2: 'Comment on acp-2021-166', Anonymous Referee #2, 28 Apr 2021
  • RC3: 'Comment on acp-2021-166', Anonymous Referee #3, 13 May 2021

Liangying Zeng et al.

Liangying Zeng et al.

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Short summary
Using an aerosol-climate model, the impacts of El Niño with different durations on aerosols in China are examined. The modulation on aerosol concentrations and haze days by short duration El Niño events is 2–3 times more than that by long duration El Niño events in China. The frequency of short duration El Niño has been increasing significantly in recent decades, suggesting that El Niño have exerted increasingly intense modulation on aerosol pollution in China over the past few decades.
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