The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds
This study investigates the interactions between cloud dynamics and aerosols in idealized large-eddy simulations (LES) of Arctic mixed-phase stratocumulus clouds (AMPS) observed at Oliktok Point, Alaska, in April 2015. This case was chosen because it allows the cloud to form in response to radiative...
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Online Access: | https://doi.org/10.5194/acp-18-17047-2018 https://www.atmos-chem-phys.net/18/17047/2018/ |
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ftcopernicus:oai:publications.copernicus.org:acp70381 2023-05-15T14:59:12+02:00 The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds Solomon, Amy Boer, Gijs Creamean, Jessie M. McComiskey, Allison Shupe, Matthew D. Maahn, Maximilian Cox, Christopher 2018-12-03 application/pdf https://doi.org/10.5194/acp-18-17047-2018 https://www.atmos-chem-phys.net/18/17047/2018/ eng eng doi:10.5194/acp-18-17047-2018 https://www.atmos-chem-phys.net/18/17047/2018/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-18-17047-2018 2019-12-24T09:49:38Z This study investigates the interactions between cloud dynamics and aerosols in idealized large-eddy simulations (LES) of Arctic mixed-phase stratocumulus clouds (AMPS) observed at Oliktok Point, Alaska, in April 2015. This case was chosen because it allows the cloud to form in response to radiative cooling starting from a cloud-free state, rather than requiring the cloud ice and liquid to adjust to an initial cloudy state. Sensitivity studies are used to identify whether there are buffering feedbacks that limit the impact of aerosol perturbations. The results of this study indicate that perturbations in ice nucleating particles (INPs) dominate over cloud condensation nuclei (CCN) perturbations; i.e., an equivalent fractional decrease in CCN and INPs results in an increase in the cloud-top longwave cooling rate, even though the droplet effective radius increases and the cloud emissivity decreases. The dominant effect of ice in the simulated mixed-phase cloud is a thinning rather than a glaciation, causing the mixed-phase clouds to radiate as a grey body and the radiative properties of the cloud to be more sensitive to aerosol perturbations. It is demonstrated that allowing prognostic CCN and INPs causes a layering of the aerosols, with increased concentrations of CCN above cloud top and increased concentrations of INPs at the base of the cloud-driven mixed layer. This layering contributes to the maintenance of the cloud liquid, which drives the dynamics of the cloud system. Text Arctic Alaska Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 18 23 17047 17059 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
This study investigates the interactions between cloud dynamics and aerosols in idealized large-eddy simulations (LES) of Arctic mixed-phase stratocumulus clouds (AMPS) observed at Oliktok Point, Alaska, in April 2015. This case was chosen because it allows the cloud to form in response to radiative cooling starting from a cloud-free state, rather than requiring the cloud ice and liquid to adjust to an initial cloudy state. Sensitivity studies are used to identify whether there are buffering feedbacks that limit the impact of aerosol perturbations. The results of this study indicate that perturbations in ice nucleating particles (INPs) dominate over cloud condensation nuclei (CCN) perturbations; i.e., an equivalent fractional decrease in CCN and INPs results in an increase in the cloud-top longwave cooling rate, even though the droplet effective radius increases and the cloud emissivity decreases. The dominant effect of ice in the simulated mixed-phase cloud is a thinning rather than a glaciation, causing the mixed-phase clouds to radiate as a grey body and the radiative properties of the cloud to be more sensitive to aerosol perturbations. It is demonstrated that allowing prognostic CCN and INPs causes a layering of the aerosols, with increased concentrations of CCN above cloud top and increased concentrations of INPs at the base of the cloud-driven mixed layer. This layering contributes to the maintenance of the cloud liquid, which drives the dynamics of the cloud system. |
format |
Text |
author |
Solomon, Amy Boer, Gijs Creamean, Jessie M. McComiskey, Allison Shupe, Matthew D. Maahn, Maximilian Cox, Christopher |
spellingShingle |
Solomon, Amy Boer, Gijs Creamean, Jessie M. McComiskey, Allison Shupe, Matthew D. Maahn, Maximilian Cox, Christopher The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds |
author_facet |
Solomon, Amy Boer, Gijs Creamean, Jessie M. McComiskey, Allison Shupe, Matthew D. Maahn, Maximilian Cox, Christopher |
author_sort |
Solomon, Amy |
title |
The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds |
title_short |
The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds |
title_full |
The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds |
title_fullStr |
The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds |
title_full_unstemmed |
The relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in Arctic mixed-phase stratocumulus clouds |
title_sort |
relative impact of cloud condensation nuclei and ice nucleating particle concentrations on phase partitioning in arctic mixed-phase stratocumulus clouds |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-17047-2018 https://www.atmos-chem-phys.net/18/17047/2018/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Alaska |
genre_facet |
Arctic Alaska |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-18-17047-2018 https://www.atmos-chem-phys.net/18/17047/2018/ |
op_doi |
https://doi.org/10.5194/acp-18-17047-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
23 |
container_start_page |
17047 |
op_container_end_page |
17059 |
_version_ |
1766331327957696512 |