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Soot-PCF: Pore condensation and freezing framework for soot aggregates

Marcolli, Claudia and Mahrt, Fabian and Kärcher, Bernd (2021) Soot-PCF: Pore condensation and freezing framework for soot aggregates. Atmospheric Chemistry and Physics (ACP) (21), pp. 7791-7843. Copernicus Publications. doi: 10.5194/acp-21-7791-2021. ISSN 1680-7316.

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Official URL: https://doi.org/10.5194/acp-21-7791-2021

Abstract

Atmospheric ice formation in cirrus clouds is often initiated by aerosol particles that act as ice-nucleating particles. The aerosol–cloud interactions of soot and associated feedbacks remain uncertain, in part because a coherent understanding of the ice nucleation mechanism and activity of soot has not yet emerged. Here, we provide a new framework that predicts ice formation on soot particles via pore condensation and freezing (PCF) that, unlike previous approaches, considers soot particle properties, capturing their vastly different pore properties compared to other aerosol species such as mineral dust. During PCF, water is taken up into pores of the soot aggregates by capillary condensation. At cirrus temperatures, the pore water can freeze homogeneously and subsequently grow into a macroscopic ice crystal. In the sootPCF framework presented here, the relative humidity conditions required for these steps are derived for different pore types as a function of temperature.

Item URL in elib:https://elib.dlr.de/142405/
Document Type:Article
Title:Soot-PCF: Pore condensation and freezing framework for soot aggregates
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Marcolli, ClaudiaIAC, ETH ZurichUNSPECIFIEDUNSPECIFIED
Mahrt, FabianUniversity of British Columbia, CNUNSPECIFIEDUNSPECIFIED
Kärcher, BerndDLR, IPAhttps://orcid.org/0000-0003-0278-4980UNSPECIFIED
Date:21 May 2021
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.5194/acp-21-7791-2021
Page Range:pp. 7791-7843
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:Soot Particles, Ice nucleation, Laboratory Measurements, Aircraft Soot
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Kärcher, Prof. Bernd
Deposited On:25 May 2021 10:34
Last Modified:25 May 2021 10:34

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