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Direct/indirect effects of aerosols and their separate contributions to Typhoon Lupit (2009): Eyewall versus peripheral rainbands

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Abstract

As a typhoon approaches the continent, the position where anthropogenic aerosols penetrate, the convection competition between the eyewall and peripheral rainbands, and the separate contributions of direct aerosol-radiation interactions (ARI) and indirect aerosol-cloud interactions (ACI), yield uncertainties in the convection intensification area and hence the typhoon intensity. Typhoon Lupit (2009) was simulated using the Weather Research and Forecasting Model with Chemistry (WRF-Chem) to investigate and isolate the direct and indirect effects of aerosols on the intensity, convection, and precipitation of the typhoon. Three simulations (CTL, CLEAN, and CTLARIOFF) were designed, representing a polluted case (CTL, considering the ingestion of anthropogenic aerosols with ARI and ACI), a clean maritime case (CLEAN, mainly with sea salt aerosols), and a polluted case without aerosol radiative forcing (CTLARIOFF, as per CTL but without ARI). The results showed that anthropogenic aerosols could penetrate into both the peripheral rainbands and the eyewall when the typhoon was approaching the Asian continent. Owing to the representation of the real aerosol scenario, the simulated typhoon intensity weakened and was closer to observed values in the CTL experiment. The ARI dominated over ACI with the opposite effects. Specifically, the ACI mainly enhanced the formation of ice-phase hydrometeors within the upper level of the eyewall with more freezing latent heat releases, leading to an invigoration of eyewall convection. These excess ice-phase particles melted after they descended into the warm layer below the 0°C level, which accelerated the accretion of cloud droplets by raindrops (Pcacr) and hence the mixed phase precipitation process in the eyewall. The dynamic feedback induced by the ACI enhanced the boundary layer inflow and the upper layer outflow, supporting the maintenance of strong eyewall convection and intensification of the typhoon. Inversely, the ARI heated the distant periphery low-level atmosphere at an altitude of 1–2 km by the absorbing polluted aerosols. The heated air, driven by the radial inflow, firstly went through the periphery rainbands of the typhoon and invigorated convection there due to the low-level warming. Then, the enhanced periphery convection inhibited the further transport of warm moist air into the eyewall, resulting in weakening of the eyewall convection and hence typhoon intensity. In sum, for the polluted scenario, as the typhoon approached the continent, ARI played a dominant role over ACI. The WRF-Chem model with full consideration of aerosol-cloud-radiation interactions is advantageous in terms of reliably simulating typhoon intensity and precipitation distribution.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 41775017 & 41675058).

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Authors and Affiliations

  1. College of Meteorology and Oceanography, National University of Defense Technology, Nanjing, 211101, China

    Zhichao Liang, Juli Ding, Jianfang Fei, Xiaoping Cheng & Xiaogang Huang

  2. PLA Troop 96746, Korla, 841000, China

    Zhichao Liang

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  1. Zhichao Liang
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  2. Juli Ding
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  3. Jianfang Fei
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  4. Xiaoping Cheng
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  5. Xiaogang Huang
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Correspondence to Juli Ding.

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Liang, Z., Ding, J., Fei, J. et al. Direct/indirect effects of aerosols and their separate contributions to Typhoon Lupit (2009): Eyewall versus peripheral rainbands. Sci. China Earth Sci. 64, 2113–2128 (2021). https://doi.org/10.1007/s11430-020-9816-7

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  • DOI: https://doi.org/10.1007/s11430-020-9816-7

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