Preprints
https://doi.org/10.5194/acp-2020-1318
https://doi.org/10.5194/acp-2020-1318

  11 Mar 2021

11 Mar 2021

Review status: a revised version of this preprint is currently under review for the journal ACP.

Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols: how ice processes affect microphysical, dynamic and thermodynamic development in those clouds and interactions?

Seoung Soo Lee1,2, Kyung-Ja Ha2, Manguttathil Gopalakrishnan Manoj3, Mohammad Kamruzzaman4,5, Hyungjun Kim6, Nobuyuki Utsumi7, and Jianping Guo8 Seoung Soo Lee et al.
  • 1Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA
  • 2Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University, Pusan, South Korea
  • 3Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Kerala, India
  • 4School of Mathematical Sciences, University of Adelaide, Adelaide, Australia
  • 5Natural and Built Environments Research Centre, Division of Information Technology, Engineering and the Environment (ITEE), University of South Australia, Adelaide, Australia
  • 6Institute of Industrial Science, University of Tokyo, Tokyo, Japan
  • 7Nagomori Institute of Actuators, Kyoto University of Advanced Science, Japan
  • 8State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China

Abstract. Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols remain poorly understood. This study examines the roles of ice processes in those clouds and interactions using a large-eddy simulation (LES) framework. Cloud mass becomes much lower in the presence of ice processes and the Wegener-Bergeron-Findeisen (WBF) mechanism in the mixed-phase clouds as compared to that in warm clouds. This is because while the WBF mechanism enhances the evaporation of droplets, the low concentration of aerosols as ice nuclei (IN) and cloud ice number concentration (CINC) prevent the efficient deposition of water vapor whose mass is contributed by the evaporation. In the mixed-phase clouds, the increasing concentration of aerosols that act as cloud condensation nuclei (CCN) decreases cloud mass by increasing the evaporation of droplets through the WBF mechanism and decreasing the intensity of updrafts. In contrast to this, in the warm clouds, the absence of the WBF mechanism makes the increase in the evaporation of droplets inefficient, eventually enabling cloud mass to increase with the increasing concentration of aerosols as CCN. Here, the results show that when there is an increasing concentration of aerosols that act as IN, the deposition of water vapor is more efficient than when there is the increasing concentration of aerosols as CCN, which in turn enables cloud mass to increase in the mixed-phase clouds.

Seoung Soo Lee et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2020-1318', Anonymous Referee #1, 08 Apr 2021
    • AC1: 'Reply on RC1', Seoung Soo Lee, 11 Jul 2021
  • RC2: 'Comment on acp-2020-1318', Anonymous Referee #2, 12 May 2021
    • AC3: 'Reply on RC2', Seoung Soo Lee, 11 Jul 2021

Seoung Soo Lee et al.

Seoung Soo Lee et al.

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Short summary
Using a modeling framework, a mid-latitude stratocumulus-cloud system is simulated. It is found that cloud mass in the system becomes very low due to interactions between ice and liquid particles as compared to that in the absence of ice particles. It is also found that interactions between cloud mass and aerosols lead to a reduction in cloud mass in the system and this is contrary to an aerosol-induced increase in cloud mass in the absence of ice particles.
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