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https://doi.org/10.5194/acp-2020-859
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-859
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Oct 2020

29 Oct 2020

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This preprint is currently under review for the journal ACP.

ENSO Effect on Interannual Variability of Spring Aerosols over East Asia

Anbao Zhu1,2, Haiming Xu1,2, Jiechun Deng1,2, Jing Ma1,2, and Shuhui Li1,2 Anbao Zhu et al.
  • 1Key Laboratory of Meteorological Disaster/KLME / ILCEC / CIC-FEMD, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 2School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China

Abstract. Effects of the El Niño/Southern Oscillation (ENSO) on the interannual variability of spring aerosols over East Asia are investigated using the Modern Era Retrospective analysis for Research and Applications Version 2 (MERRA-2) reanalysis aerosol data. Results show that the ENSO has a crucial effect on the spring aerosols over the Indochina Peninsula, southern China and the ocean south of Japan. The above-normal (below-normal) aerosols are found over these regions during the El Niño (La Niña) ensuing spring. In contrast to the local aerosol diffusion in winter, the ENSO affects East Asian aerosols in the following spring mainly via modulating upstream aerosol generation and transport processes. The underlying physical mechanism is that during the El Niño (La Niña) ensuing spring, the dry (wet) air and less (more) precipitation are beneficial for the increase (reduction) of biomass burning activities over the northern Indochina Peninsula, resulting in more (less) carbonaceous aerosol emissions. On the other hand, the anomalous anticyclone (cyclone) over the western North Pacific (WNP) associated with El Niño (La Niña) enhances (weakens) the low-level southwesterly wind from the northern Indochina Peninsula to southern Japan, which transports more (less) carbonaceous aerosol downstream. Anomalous precipitation plays a role in reducing aerosols over the source region, but its washout effect over the downstream region is limited. The ENSO’s impact on the ensuing spring aerosols is mainly attributed to the eastern Pacific ENSO rather than the central Pacific ENSO.

Anbao Zhu et al.

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Anbao Zhu et al.

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