Preprints
https://doi.org/10.5194/acp-2021-506
https://doi.org/10.5194/acp-2021-506

  01 Jul 2021

01 Jul 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 hygroscopic seeding on the initiation of precipitation formation: results of a hybrid bin microphysics parcel model

Istvan Geresdi1, Lulin Xue2,3, Sisi Chen2, Youssef Wehbe4, Roelof Bruintjes2, Jared Lee2, Roy Rasmussen2, Wojciech Grabowski2, Noemi Sarkadi1, and Sarah Tessendorf2 Istvan Geresdi et al.
  • 1University of Pécs, Faculty of Science Pécs, Hungary
  • 2National Center for Atmospheric Research, Boulder, USA
  • 3Hua Xin Chuang Zhi Sci. & Tech. LLC, Beijing, China
  • 4National Center of Meteorology, Abu Dhabi 4815, UAE

Abstract. A hybrid bin microphysical scheme is developed in a parcel model framework to study how natural aerosol particles and different types of hygroscopic seeding materials affect the precipitation formation. A novel parameter is introduced to describe the impact of different seeding particles on the evolution of the drop size distribution. The results of more than 100 numerical experiments using the hybrid bin parcel model show that: (a) The Ostwald-ripening effect has a substantial contribution to the broadening of the drop size distribution near the cloud base. The efficiency of this effect increases as the updraft velocity decreases. (b) The efficiency of hygroscopic seeding is significant only if the size of the seeding particles is in the coarse particle size range. The presence of the water-soluble background coarse particles reduces the efficiency of the seeding. (c) The efficient broadening of the size distribution due to the seeding depends on the width of the size distribution of water drops in the control cases, but the relation is not as straightforward as in the case of the glaciogenic seeding.

Istvan Geresdi et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-506', Anonymous Referee #1, 01 Aug 2021
    • AC1: 'Reply on RC1', Lulin Xue, 20 Sep 2021
  • RC2: 'Comment on acp-2021-506', Anonymous Referee #2, 10 Aug 2021
    • AC2: 'Reply on RC2', Lulin Xue, 20 Sep 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-506', Anonymous Referee #1, 01 Aug 2021
    • AC1: 'Reply on RC1', Lulin Xue, 20 Sep 2021
  • RC2: 'Comment on acp-2021-506', Anonymous Referee #2, 10 Aug 2021
    • AC2: 'Reply on RC2', Lulin Xue, 20 Sep 2021

Istvan Geresdi et al.

Istvan Geresdi et al.

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Latest update: 25 Oct 2021
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Short summary
By releasing soluble aerosols into the convective clouds, cloud seeding potentially enhances rainfall. The seeding impacts are hard to quantify with observations only. Numerical models that represent the detailed physics of aerosols, cloud and rain formation are used to investigate the seeding impacts on rain enhancement under different natural aerosol backgrounds and using different seeding materials. Our results indicate that seeding may enhance rainfall under certain conditions.
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