Preprints
https://doi.org/10.5194/acp-2022-355
https://doi.org/10.5194/acp-2022-355
 
08 Jun 2022
08 Jun 2022
Status: this preprint is currently under review for the journal ACP.

Dust pollution in China affected by different spatial and temporal types of El Niño

Yang Yang1,, Liangying Zeng1,, Hailong Wang2, Pinya Wang1, and Hong Liao1 Yang Yang 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
  • These authors contributed equally to this work.

Abstract. Dust is an important aerosol affecting air quality in China in winter and spring that is potentially influenced by the interannual climate variability associated with El Niño. In this study, the effects of different temporal and spatial types of El Niño on dust pollution in winter and spring in China and the potential mechanisms are investigated using the Energy Exascale Earth System Model version 1 (E3SMv1). We find that the Eastern Pacific (EP) and Central Pacific (CP) El Niño both increase wintertime dust concentrations by 5–50 µg m-3 over central-eastern China. Due to a stronger wind and lower relative humidity, which favor dust emissions near sources, and a strengthened northwesterly and reduced precipitation, which are conducive to dust transport, dust concentrations during the CP El Niño are 5–20 µg m-3 higher in northern China than during the EP El Niño. El Niño with a short duration (SD) increases winter dust concentrations by 20–100 µg m-3 over northern China relative to the climatological mean, while there is a decrease of 5–50 µg m-3 during the long duration (LD) El Niño, which are also related to the El Niño-induced changes in atmospheric circulation, precipitation, and relative humidity. In the following spring season, all types of El Niño events lead to an increase in dust over the northern China, but only the increase during the LD El Niño is statistically significant, suggesting that the weaker intensity but longer duration of the LD El Niño events can significantly affect spring dust in China. Our results contribute a better understanding of the influence of different types of El Niño events on dust pollution in China, which have profound implications for air pollution control and dust storm prediction.

Yang Yang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-355', Anonymous Referee #1, 29 Jun 2022
  • RC2: 'Comment on acp-2022-355', Anonymous Referee #2, 30 Jun 2022

Yang Yang et al.

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Short summary
Using an aerosol-climate model, dust pollution in China affected by different spatial and temporal types of El Niño are examined. Both Eastern and Central Pacific El Niño and short duration El Niño increase winter dust concentrations over northern China, while long duration El Niño decreases concentrations. Only long duration El Niño events can significantly affect dust over China in the following spring. This study have profound implications for air pollution control and dust storm prediction.
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