Preprints
https://doi.org/10.5194/acp-2022-49
https://doi.org/10.5194/acp-2022-49
 
03 Feb 2022
03 Feb 2022
Status: a revised version of this preprint is currently under review for the journal ACP.

Convective updrafts near sea-breeze fronts

Shizuo Fu1,2, Richard Rotunno3, and Huiwen Xue4 Shizuo Fu et al.
  • 1Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, China
  • 2School of Geographical Sciences, Fujian Normal University, Fuzhou, China
  • 3National Center for Atmospheric Research, Boulder, Colorado
  • 4Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China

Abstract. Sea-breeze fronts (SBFs) are frequently found to trigger deep convection. The convective updrafts near the SBF are critical in this triggering process. Here, the size and strength of the updrafts near an idealized SBF are investigated with large-eddy simulations. A central focus of this study is to compare the updrafts near the SBF, which are substantially affected by the SBF, to the updrafts ahead of the SBF, which develop in a typical convective boundary layer. It is found that the updrafts near the SBF are larger than, but have similar strength to, the updrafts ahead of the SBF. The larger updrafts near the SBF are produced through the merger between the postfrontal streaky structures and the updrafts originating near the SBF. Lagrangian budget analysis of vertical momentum reveals that the dynamics experienced by the parcels constituting the updrafts near the SBF is almost the same as that ahead of the SBF, so that the strength of the updrafts near the SBF is similar to that ahead of the SBF. It is also found that the size and strength of the updrafts near the SBF scale with the boundary-layer height and the convective velocity scale, respectively, like those in the typical convective boundary layer. The present results should also apply to other boundary-layer convergence lines similar to the SBF.

Shizuo Fu 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-2022-49', Anonymous Referee #1, 23 Feb 2022
  • RC2: 'Comment on acp-2022-49', Anonymous Referee #2, 11 Apr 2022
  • AC1: 'Comment on acp-2022-49', Shizuo Fu, 06 May 2022

Shizuo Fu et al.

Data sets

Updrafts near SBF Shizuo Fu https://doi.org/10.17605/OSF.IO/3HYPS

Shizuo Fu et al.

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Short summary
The convective updrafts near the sea-breeze fronts (SBFs) play important roles in initiating deep convection, but their characteristics are not well understood. By performing large-eddy simulations, we explain why the updrafts near the SBF are larger than, but have similar strength to, the updrafts ahead of the SBF. The results should also apply to other boundary-layer convergence zones similar to the SBF.
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