A model intercomparison of CCN-limited tenuous clouds in the high Arctic
We perform a model intercomparison of summertime high Arctic (>80 N) clouds observed during the 2008 Arctic Summer Cloud Ocean Study (ASCOS) campaign, when observed cloud condensation nuclei (CCN) concentrations fell below 1 cm????3. Previous analyses have suggested that at these low CCN concentr...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Zenodo
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-18-11041-2018 |
id |
ftzenodo:oai:zenodo.org:4282421 |
---|---|
record_format |
openpolar |
spelling |
ftzenodo:oai:zenodo.org:4282421 2024-09-09T19:21:23+00:00 A model intercomparison of CCN-limited tenuous clouds in the high Arctic Stevens, Robin Loewe Dearden, Christopher Dimitrelos, Antonios Possner, Anna Eirund, Gesa Raatikainen, Tomi Hill, Adrian Shipway, Benjamin Wilkinson, Jonathan Romakkaniemi, Sami Tonttila, Juha Laaksonen, Ari Korhonen, Hannele Connolly, Paul Lohmann, Ulrike Hoose, Corinna Ekman, Annica Carslaw, Ken Field, Paul 2018-08-08 https://doi.org/10.5194/acp-18-11041-2018 unknown Zenodo https://zenodo.org/communities/eu https://doi.org/10.5194/acp-18-11041-2018 oai:zenodo.org:4282421 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2018 ftzenodo https://doi.org/10.5194/acp-18-11041-2018 2024-07-25T20:34:35Z We perform a model intercomparison of summertime high Arctic (>80 N) clouds observed during the 2008 Arctic Summer Cloud Ocean Study (ASCOS) campaign, when observed cloud condensation nuclei (CCN) concentrations fell below 1 cm????3. Previous analyses have suggested that at these low CCN concentrations the liquid water content (LWC) and radiative properties of the clouds are determined primarily by the CCN concentrations, conditions that have previously been referred to as the tenuous cloud regime. The intercomparison includes results from three large eddy simulation models (UCLALES-SALSA, COSMO-LES, and MIMICA) and three numerical weather prediction models (COSMO-NWP, WRF, and UM-CASIM). We test the sensitivities of the model results to different treatments of cloud droplet activation, including prescribed cloud droplet number concentrations (CDNCs) and diagnostic CCN activation based on either fixed aerosol concentrations or prognostic aerosol with in-cloud processing. There remains considerable diversity even in experiments with prescribed CDNCs and prescribed ice crystal number concentrations (ICNC). The sensitivity of mixed-phase Arctic cloud properties to changes in CDNC depends on the representation of the cloud droplet size distribution within each model, which impacts autoconversion rates. Our results therefore suggest that properly estimating aerosol–cloud interactions requires an appropriate treatment of the cloud droplet size distribution within models, as well as in situ observations of hydrometeor size distributions to constrain them. The results strongly support the hypothesis that the liquid water content of these clouds is CCN limited. For the observed meteorological conditions, the cloud generally did not collapse when the CCN concentration was held constant at the relatively high CCN concentrations measured during the cloudy period, but the cloud thins or collapses as the CCN concentration is reduced. The CCN concentration at which collapse occurs varies substantially between models. Only one ... Article in Journal/Newspaper Arctic Zenodo Arctic Atmospheric Chemistry and Physics 18 15 11041 11071 |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
description |
We perform a model intercomparison of summertime high Arctic (>80 N) clouds observed during the 2008 Arctic Summer Cloud Ocean Study (ASCOS) campaign, when observed cloud condensation nuclei (CCN) concentrations fell below 1 cm????3. Previous analyses have suggested that at these low CCN concentrations the liquid water content (LWC) and radiative properties of the clouds are determined primarily by the CCN concentrations, conditions that have previously been referred to as the tenuous cloud regime. The intercomparison includes results from three large eddy simulation models (UCLALES-SALSA, COSMO-LES, and MIMICA) and three numerical weather prediction models (COSMO-NWP, WRF, and UM-CASIM). We test the sensitivities of the model results to different treatments of cloud droplet activation, including prescribed cloud droplet number concentrations (CDNCs) and diagnostic CCN activation based on either fixed aerosol concentrations or prognostic aerosol with in-cloud processing. There remains considerable diversity even in experiments with prescribed CDNCs and prescribed ice crystal number concentrations (ICNC). The sensitivity of mixed-phase Arctic cloud properties to changes in CDNC depends on the representation of the cloud droplet size distribution within each model, which impacts autoconversion rates. Our results therefore suggest that properly estimating aerosol–cloud interactions requires an appropriate treatment of the cloud droplet size distribution within models, as well as in situ observations of hydrometeor size distributions to constrain them. The results strongly support the hypothesis that the liquid water content of these clouds is CCN limited. For the observed meteorological conditions, the cloud generally did not collapse when the CCN concentration was held constant at the relatively high CCN concentrations measured during the cloudy period, but the cloud thins or collapses as the CCN concentration is reduced. The CCN concentration at which collapse occurs varies substantially between models. Only one ... |
format |
Article in Journal/Newspaper |
author |
Stevens, Robin Loewe Dearden, Christopher Dimitrelos, Antonios Possner, Anna Eirund, Gesa Raatikainen, Tomi Hill, Adrian Shipway, Benjamin Wilkinson, Jonathan Romakkaniemi, Sami Tonttila, Juha Laaksonen, Ari Korhonen, Hannele Connolly, Paul Lohmann, Ulrike Hoose, Corinna Ekman, Annica Carslaw, Ken Field, Paul |
spellingShingle |
Stevens, Robin Loewe Dearden, Christopher Dimitrelos, Antonios Possner, Anna Eirund, Gesa Raatikainen, Tomi Hill, Adrian Shipway, Benjamin Wilkinson, Jonathan Romakkaniemi, Sami Tonttila, Juha Laaksonen, Ari Korhonen, Hannele Connolly, Paul Lohmann, Ulrike Hoose, Corinna Ekman, Annica Carslaw, Ken Field, Paul A model intercomparison of CCN-limited tenuous clouds in the high Arctic |
author_facet |
Stevens, Robin Loewe Dearden, Christopher Dimitrelos, Antonios Possner, Anna Eirund, Gesa Raatikainen, Tomi Hill, Adrian Shipway, Benjamin Wilkinson, Jonathan Romakkaniemi, Sami Tonttila, Juha Laaksonen, Ari Korhonen, Hannele Connolly, Paul Lohmann, Ulrike Hoose, Corinna Ekman, Annica Carslaw, Ken Field, Paul |
author_sort |
Stevens, Robin |
title |
A model intercomparison of CCN-limited tenuous clouds in the high Arctic |
title_short |
A model intercomparison of CCN-limited tenuous clouds in the high Arctic |
title_full |
A model intercomparison of CCN-limited tenuous clouds in the high Arctic |
title_fullStr |
A model intercomparison of CCN-limited tenuous clouds in the high Arctic |
title_full_unstemmed |
A model intercomparison of CCN-limited tenuous clouds in the high Arctic |
title_sort |
model intercomparison of ccn-limited tenuous clouds in the high arctic |
publisher |
Zenodo |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-11041-2018 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://zenodo.org/communities/eu https://doi.org/10.5194/acp-18-11041-2018 oai:zenodo.org:4282421 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5194/acp-18-11041-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
15 |
container_start_page |
11041 |
op_container_end_page |
11071 |
_version_ |
1809761585273503744 |