Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS)
The Arctic climate is changing; temperature changes in the Arctic are greater than at midlatitudes, and changing atmospheric conditions influence Arctic mixed-phase clouds, which are important for the Arctic surface energy budget. These low-level clouds are frequently observed across the Arctic. The...
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ftdoajarticles:oai:doaj.org/article:61144130d8e74c5ca065c227b1101043 2023-05-15T14:32:25+02:00 Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) K. Loewe A. M. L. Ekman M. Paukert J. Sedlar M. Tjernström C. Hoose 2017-06-01T00:00:00Z https://doi.org/10.5194/acp-17-6693-2017 https://doaj.org/article/61144130d8e74c5ca065c227b1101043 EN eng Copernicus Publications http://www.atmos-chem-phys.net/17/6693/2017/acp-17-6693-2017.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-17-6693-2017 1680-7316 1680-7324 https://doaj.org/article/61144130d8e74c5ca065c227b1101043 Atmospheric Chemistry and Physics, Vol 17, Pp 6693-6704 (2017) Physics QC1-999 Chemistry QD1-999 article 2017 ftdoajarticles https://doi.org/10.5194/acp-17-6693-2017 2022-12-31T00:38:15Z The Arctic climate is changing; temperature changes in the Arctic are greater than at midlatitudes, and changing atmospheric conditions influence Arctic mixed-phase clouds, which are important for the Arctic surface energy budget. These low-level clouds are frequently observed across the Arctic. They impact the turbulent and radiative heating of the open water, snow, and sea-ice-covered surfaces and influence the boundary layer structure. Therefore the processes that affect mixed-phase cloud life cycles are extremely important, yet relatively poorly understood. In this study, we present sensitivity studies using semi-idealized large eddy simulations (LESs) to identify processes contributing to the dissipation of Arctic mixed-phase clouds. We found that one potential main contributor to the dissipation of an observed Arctic mixed-phase cloud, during the Arctic Summer Cloud Ocean Study (ASCOS) field campaign, was a low cloud droplet number concentration (CDNC) of about 2 cm −3 . Introducing a high ice crystal concentration of 10 L −1 also resulted in cloud dissipation, but such high ice crystal concentrations were deemed unlikely for the present case. Sensitivity studies simulating the advection of dry air above the boundary layer inversion, as well as a modest increase in ice crystal concentration of 1 L −1 , did not lead to cloud dissipation. As a requirement for small droplet numbers, pristine aerosol conditions in the Arctic environment are therefore considered an important factor determining the lifetime of Arctic mixed-phase clouds. Article in Journal/Newspaper Arctic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 17 11 6693 6704 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 K. Loewe A. M. L. Ekman M. Paukert J. Sedlar M. Tjernström C. Hoose Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The Arctic climate is changing; temperature changes in the Arctic are greater than at midlatitudes, and changing atmospheric conditions influence Arctic mixed-phase clouds, which are important for the Arctic surface energy budget. These low-level clouds are frequently observed across the Arctic. They impact the turbulent and radiative heating of the open water, snow, and sea-ice-covered surfaces and influence the boundary layer structure. Therefore the processes that affect mixed-phase cloud life cycles are extremely important, yet relatively poorly understood. In this study, we present sensitivity studies using semi-idealized large eddy simulations (LESs) to identify processes contributing to the dissipation of Arctic mixed-phase clouds. We found that one potential main contributor to the dissipation of an observed Arctic mixed-phase cloud, during the Arctic Summer Cloud Ocean Study (ASCOS) field campaign, was a low cloud droplet number concentration (CDNC) of about 2 cm −3 . Introducing a high ice crystal concentration of 10 L −1 also resulted in cloud dissipation, but such high ice crystal concentrations were deemed unlikely for the present case. Sensitivity studies simulating the advection of dry air above the boundary layer inversion, as well as a modest increase in ice crystal concentration of 1 L −1 , did not lead to cloud dissipation. As a requirement for small droplet numbers, pristine aerosol conditions in the Arctic environment are therefore considered an important factor determining the lifetime of Arctic mixed-phase clouds. |
format |
Article in Journal/Newspaper |
author |
K. Loewe A. M. L. Ekman M. Paukert J. Sedlar M. Tjernström C. Hoose |
author_facet |
K. Loewe A. M. L. Ekman M. Paukert J. Sedlar M. Tjernström C. Hoose |
author_sort |
K. Loewe |
title |
Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_short |
Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_full |
Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_fullStr |
Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_full_unstemmed |
Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_sort |
modelling micro- and macrophysical contributors to the dissipation of an arctic mixed-phase cloud during the arctic summer cloud ocean study (ascos) |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/acp-17-6693-2017 https://doaj.org/article/61144130d8e74c5ca065c227b1101043 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Atmospheric Chemistry and Physics, Vol 17, Pp 6693-6704 (2017) |
op_relation |
http://www.atmos-chem-phys.net/17/6693/2017/acp-17-6693-2017.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-17-6693-2017 1680-7316 1680-7324 https://doaj.org/article/61144130d8e74c5ca065c227b1101043 |
op_doi |
https://doi.org/10.5194/acp-17-6693-2017 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
17 |
container_issue |
11 |
container_start_page |
6693 |
op_container_end_page |
6704 |
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1766305828052140032 |