The impact of secondary ice production on Arctic stratocumulus
In situ measurements of Arctic clouds frequently show that ice crystal number concentrations (ICNCs) are much higher than the number of available ice-nucleating particles (INPs), suggesting that secondary ice production (SIP) may be active. Here we use a Lagrangian parcel model (LPM) and a large-edd...
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Gottingen, COPERNICUS GESELLSCHAFT MBH
2020
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ftinfoscience:oai:infoscience.epfl.ch:275832 2023-05-15T14:49:20+02:00 The impact of secondary ice production on Arctic stratocumulus Sotiropoulou, Georgia Sullivan, Sylvia Savre, Julien Lloyd, Gary Lachlan-Cope, Thomas Ekman, Annica M. L. Nenes, Athanasios 2020-03-03T10:01:01Z https://doi.org/10.5194/acp-20-1301-2020 https://infoscience.epfl.ch/record/275832/files/acp-20-1301-2020.pdf http://infoscience.epfl.ch/record/275832 unknown Gottingen, COPERNICUS GESELLSCHAFT MBH isi:000512315200003 doi:10.5194/acp-20-1301-2020 https://infoscience.epfl.ch/record/275832/files/acp-20-1301-2020.pdf http://infoscience.epfl.ch/record/275832 http://infoscience.epfl.ch/record/275832 Text 2020 ftinfoscience https://doi.org/10.5194/acp-20-1301-2020 2023-02-13T22:58:58Z In situ measurements of Arctic clouds frequently show that ice crystal number concentrations (ICNCs) are much higher than the number of available ice-nucleating particles (INPs), suggesting that secondary ice production (SIP) may be active. Here we use a Lagrangian parcel model (LPM) and a large-eddy simulation (LES) to investigate the impact of three SIP mechanisms (rime splintering, breakup from ice-ice collisions and drop shattering) on a summer Arctic stratocumulus case observed during the Aerosol-Cloud Coupling And Climate Interactions in the Arctic (AC-CACIA) campaign. Primary ice alone cannot explain the observed ICNCs, and drop shattering is ineffective in the examined conditions. Only the combination of both rime splintering (RS) and collisional break-up (BR) can explain the observed ICNCs, since both of these mechanisms are weak when activated alone. In contrast to RS, BR is currently not represented in large-scale models; however our results indicate that this may also be a critical ice-multiplication mechanism. In general, low sensitivity of the ICNCs to the assumed INP, to the cloud condensation nuclei (CCN) conditions and also to the choice of BR parameterization is found. Finally, we show that a simplified treatment of SIP, using a LPM constrained by a LES and/or observations, provides a realistic yet computationally efficient way to study SIP effects on clouds. This method can eventually serve as a way to parameterize SIP processes in large-scale models. Text Arctic EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Arctic Rime ENVELOPE(6.483,6.483,62.567,62.567) Atmospheric Chemistry and Physics 20 3 1301 1316 |
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Open Polar |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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ftinfoscience |
language |
unknown |
description |
In situ measurements of Arctic clouds frequently show that ice crystal number concentrations (ICNCs) are much higher than the number of available ice-nucleating particles (INPs), suggesting that secondary ice production (SIP) may be active. Here we use a Lagrangian parcel model (LPM) and a large-eddy simulation (LES) to investigate the impact of three SIP mechanisms (rime splintering, breakup from ice-ice collisions and drop shattering) on a summer Arctic stratocumulus case observed during the Aerosol-Cloud Coupling And Climate Interactions in the Arctic (AC-CACIA) campaign. Primary ice alone cannot explain the observed ICNCs, and drop shattering is ineffective in the examined conditions. Only the combination of both rime splintering (RS) and collisional break-up (BR) can explain the observed ICNCs, since both of these mechanisms are weak when activated alone. In contrast to RS, BR is currently not represented in large-scale models; however our results indicate that this may also be a critical ice-multiplication mechanism. In general, low sensitivity of the ICNCs to the assumed INP, to the cloud condensation nuclei (CCN) conditions and also to the choice of BR parameterization is found. Finally, we show that a simplified treatment of SIP, using a LPM constrained by a LES and/or observations, provides a realistic yet computationally efficient way to study SIP effects on clouds. This method can eventually serve as a way to parameterize SIP processes in large-scale models. |
format |
Text |
author |
Sotiropoulou, Georgia Sullivan, Sylvia Savre, Julien Lloyd, Gary Lachlan-Cope, Thomas Ekman, Annica M. L. Nenes, Athanasios |
spellingShingle |
Sotiropoulou, Georgia Sullivan, Sylvia Savre, Julien Lloyd, Gary Lachlan-Cope, Thomas Ekman, Annica M. L. Nenes, Athanasios The impact of secondary ice production on Arctic stratocumulus |
author_facet |
Sotiropoulou, Georgia Sullivan, Sylvia Savre, Julien Lloyd, Gary Lachlan-Cope, Thomas Ekman, Annica M. L. Nenes, Athanasios |
author_sort |
Sotiropoulou, Georgia |
title |
The impact of secondary ice production on Arctic stratocumulus |
title_short |
The impact of secondary ice production on Arctic stratocumulus |
title_full |
The impact of secondary ice production on Arctic stratocumulus |
title_fullStr |
The impact of secondary ice production on Arctic stratocumulus |
title_full_unstemmed |
The impact of secondary ice production on Arctic stratocumulus |
title_sort |
impact of secondary ice production on arctic stratocumulus |
publisher |
Gottingen, COPERNICUS GESELLSCHAFT MBH |
publishDate |
2020 |
url |
https://doi.org/10.5194/acp-20-1301-2020 https://infoscience.epfl.ch/record/275832/files/acp-20-1301-2020.pdf http://infoscience.epfl.ch/record/275832 |
long_lat |
ENVELOPE(6.483,6.483,62.567,62.567) |
geographic |
Arctic Rime |
geographic_facet |
Arctic Rime |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
http://infoscience.epfl.ch/record/275832 |
op_relation |
isi:000512315200003 doi:10.5194/acp-20-1301-2020 https://infoscience.epfl.ch/record/275832/files/acp-20-1301-2020.pdf http://infoscience.epfl.ch/record/275832 |
op_doi |
https://doi.org/10.5194/acp-20-1301-2020 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
20 |
container_issue |
3 |
container_start_page |
1301 |
op_container_end_page |
1316 |
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1766320388416995328 |