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 available ice-nucleating particles (INPs), suggesting that Secondary Ice Production (SIP) may be active. Here we use a Lagrangian Parcel Model and a Large Eddy Simulation to...
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ftcopernicus:oai:publications.copernicus.org:acpd79946 2023-05-15T14:50:21+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 2019-09-17 application/pdf https://doi.org/10.5194/acp-2019-804 https://www.atmos-chem-phys-discuss.net/acp-2019-804/ eng eng doi:10.5194/acp-2019-804 https://www.atmos-chem-phys-discuss.net/acp-2019-804/ eISSN: 1680-7324 Text 2019 ftcopernicus https://doi.org/10.5194/acp-2019-804 2019-12-24T09:48:31Z In-situ measurements of Arctic clouds frequently show that ice crystal number concentrations (ICNCs) are much higher than the available ice-nucleating particles (INPs), suggesting that Secondary Ice Production (SIP) may be active. Here we use a Lagrangian Parcel Model and a Large Eddy Simulation to investigate the impact of three SIP mechanisms (rime-splintering, break-up from ice-ice collisions and droplet-shattering) on a summer Arctic stratocumulus case observed during the Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) campaign. Primary ice alone cannot explain the observed ICNCs, and droplet-shattering is an ineffective SIP mechanism for the conditions considered. Rime-splintering, a mechanism that usually dominates within the studied temperature range, is also weak owing to the lack of large droplets to initiate this process. In contrast, break-up enhances ICNCs by 1–1.5 orders of magnitude, bringing simulations in good agreement with observations. Combining both processes can further explain some of the largest ICNCs observed. The main conclusions of this study show low sensitivity to the assumed INP and Cloud Condensation Nuclei (CCN) conditions. Our results indicate that collisional break-up may be an important ice-multiplication mechanism that is currently not represented in large-scale models. Finally, we also show that a simplified treatment of SIP, using a LPM constrained by a LES and/or observations, provides a realistic yet computationally efficient description of SIP effects that can eventually serve as an efficient way to parameterize this process in large-scale models. Text Arctic Copernicus Publications: E-Journals Arctic Rime ENVELOPE(6.483,6.483,62.567,62.567) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
In-situ measurements of Arctic clouds frequently show that ice crystal number concentrations (ICNCs) are much higher than the available ice-nucleating particles (INPs), suggesting that Secondary Ice Production (SIP) may be active. Here we use a Lagrangian Parcel Model and a Large Eddy Simulation to investigate the impact of three SIP mechanisms (rime-splintering, break-up from ice-ice collisions and droplet-shattering) on a summer Arctic stratocumulus case observed during the Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) campaign. Primary ice alone cannot explain the observed ICNCs, and droplet-shattering is an ineffective SIP mechanism for the conditions considered. Rime-splintering, a mechanism that usually dominates within the studied temperature range, is also weak owing to the lack of large droplets to initiate this process. In contrast, break-up enhances ICNCs by 1–1.5 orders of magnitude, bringing simulations in good agreement with observations. Combining both processes can further explain some of the largest ICNCs observed. The main conclusions of this study show low sensitivity to the assumed INP and Cloud Condensation Nuclei (CCN) conditions. Our results indicate that collisional break-up may be an important ice-multiplication mechanism that is currently not represented in large-scale models. Finally, we also show that a simplified treatment of SIP, using a LPM constrained by a LES and/or observations, provides a realistic yet computationally efficient description of SIP effects that can eventually serve as an efficient way to parameterize this process 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 |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-2019-804 https://www.atmos-chem-phys-discuss.net/acp-2019-804/ |
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 |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-2019-804 https://www.atmos-chem-phys-discuss.net/acp-2019-804/ |
op_doi |
https://doi.org/10.5194/acp-2019-804 |
_version_ |
1766321390085996544 |