Preprints
https://doi.org/10.5194/acp-2022-453
https://doi.org/10.5194/acp-2022-453
 
02 Aug 2022
02 Aug 2022
Status: this preprint is currently under review for the journal ACP.

Instant and delayed effects of march biomass burning aerosols over the Indochina Peninsula

Anbao Zhu1,2, Haiming Xu1,2, Jiechun Deng1,2, Jing Ma1,2, and Shaofeng Hua3 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
  • 3CMA Weather Modification Centre (WMC), Beijing 100081, China

Abstract. Through analyzing observations and simulations from the Weather Research and Forecasting model coupled with Chemistry, we investigated instant and delayed responses of large-scale atmospheric circulations and precipitation to biomass burning (BB) aerosols over the Indochina Peninsula (ICP) in the peak emission of March. The results show that the BB aerosols inhibit precipitation over the ICP in March, and promote precipitation from early-April to mid-April. Specifically, the March BB aerosols over the ICP can induce mid-to-lower tropospheric heating and planetary boundary layer cooling, to enhance local atmospheric stability; meanwhile, the perturbation heating can trigger an anomalous low in the lower troposphere to moisten the mid troposphere. However, the convection suppression due to the stabilized atmosphere dominates over the favorable water-vapor condition induced by large-scale circulation responses, leading to an overall reduced precipitation over the ICP in March. For the delayed effect, the anomalous low can provide more water vapor as the monsoon advances in early-April, although it becomes much weaker without BB aerosols’ strong heating. On the other hand, the convective instability above 850 hPa is enhanced by more water vapor, resulting in enhanced precipitation over the ICP, northern South China Sea, and southern China. Thereafter, the condensational latent heating gradually takes over from the BB aerosol radiative heating, acting as the main driver for maintaining the anomalous circulation and thus the delayed effect in mid-April.

Anbao Zhu et al.

Status: open (until 13 Sep 2022)

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Anbao Zhu et al.

Anbao Zhu et al.

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Short summary
This study demonstrates the instant and delayed effects of biomass burning (BB) aerosols on precipitation over the Indochina Peninsula (ICP). The convection suppression due to the BB aerosol-induced stabilized atmosphere dominates over the favorable water-vapor condition induced by large-scale circulation responses, leading to an overall reduced precipitation in March. While the delayed effect promotes precipitation from early-April to mid-April due to the anomalous atmospheric circulations.
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