Preprints
https://doi.org/10.5194/acp-2022-492
https://doi.org/10.5194/acp-2022-492
 
20 Sep 2022
20 Sep 2022
Status: this preprint is currently under review for the journal ACP.

The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in eastern China as seen from multiple source observations

Hongxia Zhu1, Rui Li1,2,3, Shuping Yang1, Chun Zhao1, Zhe Jiang1, and Chen Huang1 Hongxia Zhu et al.
  • 1School of Earth and Space Science, Comparative Planetary Excellence Innovation Center, University of Science and Technology of China, Hefei 230026, China
  • 2State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
  • 3Institut de recherche sur les forêts, Université du Québec en Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, J9X 5E4, Canada

Abstract. The potential impacts of dust aerosol and atmospheric convective available potential energy (CAPE) on the vertical development of precipitating clouds in eastern China were studied using multiple-sources observations. In the study area, heavy dusty condition is coupled with strong north wind which carried airmass contained high concentration of mineral dust particles with cold temperature and strong wind shear. This leads to weaker CAPE in dusty days comparing with that in pristine days. Based on satellite observations, the precipitating drops under dusty condition grow faster at middle layer (with temperature -5 °C to +2 °C) but slower at upper and lower layer comparing with the pristine counterpart. For a given precipitation top height, the precipitation rate under dusty condition is weaker in upper layer but heavier at middle and lower layer. And the associated latent heating rate released by precipitation at middle layer is stronger. The precipitation top temperature (PTT) shows fairly good linear relationship with near surface rain rate (NSRR). The linear regression slope between PTT and NSRR are stable at dusty and pristine conditions. However, the PTT0 (precipitation top temperature related to rain onset) at the onset of rain are highly affected by both CAPE and aerosol condition. In pristine days, stronger CAPE facilitate the vertical development of precipitation and leads to a decrease of PTT0 at the rate of -0.65 °C per 100 J kg-1 CAPE for deep convective precipitation with variation of 15 %, and by -0.41 °C per 100 J kg-1 CAPE for stratiform precipitation with variation of 12 %. After removing the impacts of CAPE on PTT, dust aerosols lead an increase of PTT at the rate by +4.19 °C per unit AOD for deep convective precipitation and by +0.35 °C per unit AOD for stratiform precipitation. This study showed clear evidence that meteorology conditions are combined with aerosol condition together to affect the vertical development of precipitation clouds. And quantitative estimation of the sensitivity of PTT to CAPE and dust were provided.

Hongxia Zhu et al.

Status: open (until 01 Nov 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Hongxia Zhu et al.

Hongxia Zhu et al.

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Short summary
The impacts of atmospheric dust aerosols and cloud dynamic conditions on precipitation vertical development in southeastern China were studied using multiple satellite observations. The precipitating drops under dusty condition grow faster at middle layer but slower at upper and lower layer comparing with the pristine counterpart. Quantitative estimation of the sensitivity of precipitation top temperature to dust aerosol optical thickness were provided.
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