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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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This study analyzed the nature, mechanisms and drivers for Hot-and-Polluted episodes (HPEs) in the Pearl River Delta, China. A total of eight HPEs were identified and can be grouped into three clusters of HPEs that were respectively driven (1) by weak subsidence and convection induced by approaching tropical cyclones, (2) by calm conditions with low wind speed at the lower atmosphere, and (3) by the combination of both aforementioned conditions.
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https://doi.org/10.5194/acp-2020-1068
https://doi.org/10.5194/acp-2020-1068

  08 Dec 2020

08 Dec 2020

Review status: this preprint is currently under review for the journal ACP.

Characteristics of surface energy balance and atmospheric circulation during hot-and-polluted episodes and their synergistic relationships with urban heat islands over the Pearl River Delta region

Ifeanyichukwu C. Nduka1, Steve Hung Lam Yim1,2, Chi-Yung Tam3, and Jianping Guo4 Ifeanyichukwu C. Nduka et al.
  • 1Department of Geography and Resource Management, The Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong, China
  • 2Stanley Ho Big Data Decision Analytics Research Centre, The Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong, China
  • 3Earth System Science Programme, The Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong, China
  • 4State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China

Abstract. This study analyzed the nature, mechanisms and drivers for Hot-and-Polluted episodes (HPEs) in the Pearl River Delta, China. Numerical model simulations were conducted for summer and autumn of 2009–2011. A total of eight HPEs were identified, mainly happening in August and September. K-means clustering was applied to group the HPEs into three clusters based on their characteristics and mechanism. We found three HPEs were driven by weak subsidence and convection induced by approaching tropical cyclones (TC-HPE), two HPEs was controlled by calm conditions (ST-HPE) with low wind speed at the lower atmosphere, whereas the remaining three HPEs were driven by the combination of both aforementioned systems (HY-HPE). TC-HPE and ST-HPE had both positive synergistic effect between HPE and UHI (~1.1 °C increase); whereas no discernible synergistic effect was found in HY-HPE. Total aerosol radiative forcing (TARF) caused a reduction in temperature (0.5–1.0 °C) in TC-HPE and ST-HPE, but an increase (0.5 °C) in HY-HPE.

Ifeanyichukwu C. Nduka et al.

 
Status: open (until 02 Feb 2021)
Status: open (until 02 Feb 2021)
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Ifeanyichukwu C. Nduka et al.

Ifeanyichukwu C. Nduka et al.

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Short summary
This study analyzed the nature, mechanisms and drivers for Hot-and-Polluted episodes (HPEs) in the Pearl River Delta, China. A total of eight HPEs were identified and can be grouped into three clusters of HPEs that were respectively driven (1) by weak subsidence and convection induced by approaching tropical cyclones, (2) by calm conditions with low wind speed at the lower atmosphere, and (3) by the combination of both aforementioned conditions.
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