Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.414 IF 5.414
  • IF 5-year value: 5.958 IF 5-year
    5.958
  • CiteScore value: 9.7 CiteScore
    9.7
  • SNIP value: 1.517 SNIP 1.517
  • IPP value: 5.61 IPP 5.61
  • SJR value: 2.601 SJR 2.601
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 191 Scimago H
    index 191
  • h5-index value: 89 h5-index 89
Preprints
https://doi.org/10.5194/acp-2017-714
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2017-714
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 15 Sep 2017

Submitted as: research article | 15 Sep 2017

Review status
This preprint was under review for the journal ACP but the revision was not accepted.

On the Freezing Time of Supercooled Drops in Developing Convective Clouds

Jing Yang1, Zhien Wang1, and Andrew Heymsfield2 Jing Yang et al.
  • 1Department of Atmospheric Science, University of Wyoming, Laramie, WY
  • 2National Center for Atmospheric Research, Boulder, CO

Abstract. In this study, the particle size distributions (PSDs) measured in fresh developing maritime convective clouds sampled during the Ice in Clouds-Tropical (ICE-T) project are shown and compared with the PSDs modeled using a parcel model containing a spectral bin microphysics scheme. The observations suggest that the first ice in convective clouds is small. To interpret the observed ice PSDs, the freezing times and temperatures of supercooled drops are analyzed. The results indicate that the freezing time is longer for large drops than it is for small drops. Due to instrumental limitations, freezing drops cannot be identified until they exhibit obvious shape deformation. If the updraft is strong enough, large freezing drops can be carried upwards to a lower temperature than their nucleation temperature before obvious shape deformation occurs. In models, drop freezing is assumed to be instantaneous, which is not realistic; thus, the model yields a broader first ice PSD than is observed. This study allows us to interpret the observed ice PSDs in fresh developing convective clouds from the perspective of the freezing time of supercooled drops and notes the deficiency of instantaneous drop freezing in models. To better understand the mechanisms of drop freezing and ice initiation in convective clouds, more laboratory experiments and in situ measurements are needed in the future.

Jing Yang et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Jing Yang et al.

Jing Yang et al.

Viewed

Total article views: 580 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
416 153 11 580 11 14
  • HTML: 416
  • PDF: 153
  • XML: 11
  • Total: 580
  • BibTeX: 11
  • EndNote: 14
Views and downloads (calculated since 15 Sep 2017)
Cumulative views and downloads (calculated since 15 Sep 2017)

Viewed (geographical distribution)

Total article views: 574 (including HTML, PDF, and XML) Thereof 573 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 05 Jul 2020
Publications Copernicus
Download
Short summary
This study shows the freezing time is longer for large drops than small drops. Due to instrumental limitations, freezing drops cannot be identified until they exhibit obvious shape deformation. In models, drop freezing is assumed to be instantaneous, which is not realistic; thus, the model yields a broader first ice PSD than is observed. This study allows us to interpret the observed ice PSDs in developing convective clouds, and notes the deficiency of instantaneous drop freezing in models.
This study shows the freezing time is longer for large drops than small drops. Due to...
Citation