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Discussion papers | Copyright
https://doi.org/10.5194/acp-2017-755
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Oct 2017

Research article | 13 Oct 2017

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

Investigating the role of dust in ice nucleation within clouds and further effects on the regional weather system over East Asia – Part II: modification of the weather system

Lin Su1 and Jimmy C.H. Fung2,3 Lin Su and Jimmy C.H. Fung
  • 1School of Science, Hong Kong University of Science and Technology, Hong Kong, China
  • 2Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China
  • 3Department of Mathematics, Hong Kong University of Science and Technology, Hong Kong, China

Abstract. An updated version of the Weather Research and Forecast model coupled with Chemistry (WRF-Chem) was applied to quantify and discuss the full effects of dust on the meteorological field over East Asia during March and April 2012. The performances of the model in simulating the short-wave and long-wave radiation, surface temperature, and precipitation over East Asia are improved by incorporating the effects of dust in the simulations. The radiative forcing induced by the dust-enhanced cloud radiative effect is over one order of magnitude larger than that induced by the direct effect of dust. The semi-direct and indirect effects of dust result in a substantial increase in mid- to high clouds, and a significant reduction in low clouds, leading to a decrease of near-surface temperature and an increase of temperature at the mid- to upper troposphere over East Asia. The spatial redistribution of atmospheric water vapor and modification of the vertical temperature profile over East Asia lead to an inhibition of atmospheric instability over most land areas, but an enhancement of atmospheric instability over South China and the ocean, resulting in a significant inhibition of convective precipitation in areas from central to East China, and a substantial enhancement of convective precipitation over South China. Meanwhile, non-convective precipitation is also reduced significantly over East Asia, as cloud droplets are hindered from growing large enough to form rain droplets, due to the semi-direct and indirect effects of dust. The total precipitation can be reduced or increased by up to 20% or more.

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Lin Su and Jimmy C.H. Fung
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Lin Su and Jimmy C.H. Fung
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