Preprints
https://doi.org/10.5194/acp-2021-101
https://doi.org/10.5194/acp-2021-101

  18 Mar 2021

18 Mar 2021

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Impact of high and low vorticity turbulence on cloud environment mixing and cloud microphysics processes

Bipin Kumar1, Rahul Ranjan1,2, Man-Kong Yau3, Sudarsan Bera1, and Suryachadra A. Rao1 Bipin Kumar et al.
  • 1Indian Institute of Tropical Meteorology, Ministry of Earth Scinces, Homi Bhabha Road, Pashan, 411008, India
  • 2Department of Atmospheric and Space Science, Savitribai Phule Pune University, Pune, India 411007, India
  • 3Department of Atmospheric and Ocean Science, McGill University, Burnside 805 Sherbrooke Street Montreal, Quebec, Canada H3A 0B9

Abstract. Turbulent mixing of dry air affects evolution of cloud droplet size spectrum through various mechanisms. In a turbulent cloud, high and low vorticity regions coexist and inertial clustering of cloud droplets can occur in a low vorticity region. The non-uniformity in spatial distribution of size and number of droplets, variable vertical velocity in vortical turbulent structures, and dilution by entrainment/mixing may result in spatial supersaturation variability, which affects the evolution of the cloud droplet size spectrum by condensation and evaporation processes. To untangle the processes involved in mixing phenomena, a direct numerical simulation (DNS) of turbulent-mixing followed by droplet evaporation/condensation in a submeter-cubed-sized domain with a large number of droplets is performed in this study. Analysis focused on the thermodynamic and microphysical characteristics of the droplets and flow in high and low vorticity regions. The impact of vorticity production in turbulent flows on mixing and cloud microphysics is illustrated.

Bipin Kumar et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-101', Anonymous Referee #1, 09 Apr 2021
    • AC1: 'Reply on RC1', Bipin Kumar, 27 May 2021
  • RC2: 'Comment on acp-2021-101', Anonymous Referee #2, 14 Apr 2021
    • AC2: 'Reply on RC2', Bipin Kumar, 27 May 2021
    • AC3: 'Reply on RC2', Bipin Kumar, 27 May 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-101', Anonymous Referee #1, 09 Apr 2021
    • AC1: 'Reply on RC1', Bipin Kumar, 27 May 2021
  • RC2: 'Comment on acp-2021-101', Anonymous Referee #2, 14 Apr 2021
    • AC2: 'Reply on RC2', Bipin Kumar, 27 May 2021
    • AC3: 'Reply on RC2', Bipin Kumar, 27 May 2021

Bipin Kumar et al.

Bipin Kumar et al.

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Short summary
The characteristics of turbulent clouds are affected by the entrainment of ambient dry air and its subsequent mixing. A turbulent flow generates vorticities of different intensities and regions with high vorticity (HV) and low vorticity (LV) exist. This study provides a detailed analysis of different properties of turbulent flows and cloud droplets in the HV and LV regions to understand the impact of vorticity production on cloud microphysical and mixing processes.
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