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Title: Immersion Freezing of Total Ambient Aerosols and Ice Residuals

Abstract

This laboratory study reports pre-activation measurements of the size-selected un-activated ambient or total aerosols at the temperature range from -26 to -34°C using two continuous-flow diffusion chamber style ice nucleation chambers. Two different experiments (A and B) were performed in immersion freezing mode. In experiment A, frozen fraction of total aerosol was measured, whereas in experiment B frozen fraction of ice residuals (IR) obtained through sublimation of nucleated ice crystals was measured. Frozen fractions at respective temperatures from experiment B were observed to be higher than A, and therefore it was concluded that ambient particles show pre-activation phenomenon. Furthermore, single-particle elemental composition analyses of the total aerosols showed that majority of the particles are dust particles coated by organic matter. In general, this study suggests that such internally mixed complex total aerosols are efficient ice nucleating particles (INPs) and motivates further research to examine the physio-chemical properties of IR particles to explain the phenomenon of pre-activation.

Authors:
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1438997
Report Number(s):
PNNL-SA-127607
Journal ID: ISSN 2073-4433; ATMOCZ
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Atmosphere (Basel); Journal Volume: 9; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
Ice chamber; aerosol

Citation Formats

Kulkarni, Gourihar. Immersion Freezing of Total Ambient Aerosols and Ice Residuals. United States: N. p., 2018. Web. doi:10.3390/atmos9020055.
Kulkarni, Gourihar. Immersion Freezing of Total Ambient Aerosols and Ice Residuals. United States. doi:10.3390/atmos9020055.
Kulkarni, Gourihar. Thu . "Immersion Freezing of Total Ambient Aerosols and Ice Residuals". United States. doi:10.3390/atmos9020055.
@article{osti_1438997,
title = {Immersion Freezing of Total Ambient Aerosols and Ice Residuals},
author = {Kulkarni, Gourihar},
abstractNote = {This laboratory study reports pre-activation measurements of the size-selected un-activated ambient or total aerosols at the temperature range from -26 to -34°C using two continuous-flow diffusion chamber style ice nucleation chambers. Two different experiments (A and B) were performed in immersion freezing mode. In experiment A, frozen fraction of total aerosol was measured, whereas in experiment B frozen fraction of ice residuals (IR) obtained through sublimation of nucleated ice crystals was measured. Frozen fractions at respective temperatures from experiment B were observed to be higher than A, and therefore it was concluded that ambient particles show pre-activation phenomenon. Furthermore, single-particle elemental composition analyses of the total aerosols showed that majority of the particles are dust particles coated by organic matter. In general, this study suggests that such internally mixed complex total aerosols are efficient ice nucleating particles (INPs) and motivates further research to examine the physio-chemical properties of IR particles to explain the phenomenon of pre-activation.},
doi = {10.3390/atmos9020055},
journal = {Atmosphere (Basel)},
number = 2,
volume = 9,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2018},
month = {Thu Feb 01 00:00:00 EST 2018}
}