skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Initiation of secondary ice production in clouds

Abstract

Here, the disparities between the measured concentrations of ice-nucleating particles (INPs) and in-cloud ice crystal number concentrations (ICNCs) have led to the hypothesis that mechanisms other than primary nucleation form ice in the atmosphere. Here, we model three of these secondary production mechanisms – rime splintering, frozen droplet shattering,and ice–ice collisional breakup – with a six-hydrometeor-class parcel model. We perform three sets of simulations to understand temporal evolution of ice hydrometeor number ( N ice), thermodynamic limitations, and the impact ofparametric uncertainty when secondary production is active. Output is assessed in terms of the number of primarily nucleated ice crystals that must exist before secondary production initiates ( N INP ( lim ) ) as well as the ICNC enhancement from secondary production and the timing of a 100-fold enhancement. N ice evolution can be understood in terms of collision-based nonlinearity and the “phasedness” of the process, i.e., whether it involves ice hydrometeors, liquid ones, or both. Ice–ice collisional breakup is the only process for which a meaningful N INP ( lim ) exists (0.002 up to 0.15L –1). For droplet shattering and rime splintering,a warm enough cloud base temperature and modest updraft are the more important criteria for initiation. The low values of N INP ( lim ) here suggest that, under appropriate thermodynamic conditions for secondary ice production, perturbations in cloud concentration nuclei concentrations are more influential in mixed-phase partitioning than those in INP concentrations.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [2]; ORCiD logo [3]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Karlsruhe Institute of Technology, Karlsruhe (Germany)
  3. Georgia Inst. of Technology, Atlanta, GA (United States); ICE-HT, Patras (Greece); National Observatory of Athens, Athens (Greece)
Publication Date:
Research Org.:
Georgia Inst. of Technology, Atlanta, GA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1502125
Grant/Contract Number:  
SC0007145
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 3; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Sullivan, Sylvia C., Hoose, Corinna, Kiselev, Alexei, Leisner, Thomas, and Nenes, Athanasios. Initiation of secondary ice production in clouds. United States: N. p., 2018. Web. doi:10.5194/acp-18-1593-2018.
Sullivan, Sylvia C., Hoose, Corinna, Kiselev, Alexei, Leisner, Thomas, & Nenes, Athanasios. Initiation of secondary ice production in clouds. United States. doi:10.5194/acp-18-1593-2018.
Sullivan, Sylvia C., Hoose, Corinna, Kiselev, Alexei, Leisner, Thomas, and Nenes, Athanasios. Mon . "Initiation of secondary ice production in clouds". United States. doi:10.5194/acp-18-1593-2018. https://www.osti.gov/servlets/purl/1502125.
@article{osti_1502125,
title = {Initiation of secondary ice production in clouds},
author = {Sullivan, Sylvia C. and Hoose, Corinna and Kiselev, Alexei and Leisner, Thomas and Nenes, Athanasios},
abstractNote = {Here, the disparities between the measured concentrations of ice-nucleating particles (INPs) and in-cloud ice crystal number concentrations (ICNCs) have led to the hypothesis that mechanisms other than primary nucleation form ice in the atmosphere. Here, we model three of these secondary production mechanisms – rime splintering, frozen droplet shattering,and ice–ice collisional breakup – with a six-hydrometeor-class parcel model. We perform three sets of simulations to understand temporal evolution of ice hydrometeor number (Nice), thermodynamic limitations, and the impact ofparametric uncertainty when secondary production is active. Output is assessed in terms of the number of primarily nucleated ice crystals that must exist before secondary production initiates (NINP(lim)) as well as the ICNC enhancement from secondary production and the timing of a 100-fold enhancement. Nice evolution can be understood in terms of collision-based nonlinearity and the “phasedness” of the process, i.e., whether it involves ice hydrometeors, liquid ones, or both. Ice–ice collisional breakup is the only process for which a meaningfulNINP(lim) exists (0.002 up to 0.15L–1). For droplet shattering and rime splintering,a warm enough cloud base temperature and modest updraft are the more important criteria for initiation. The low values ofNINP(lim) here suggest that, under appropriate thermodynamic conditions for secondary ice production, perturbations in cloud concentration nuclei concentrations are more influential in mixed-phase partitioning than those in INP concentrations.},
doi = {10.5194/acp-18-1593-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 3,
volume = 18,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: