Processes contributing to cloud dissipation and formation events on the North Slope of Alaska
Clear-sky periods across the high latitudes have profound impacts on the surface energy budget and lower atmospheric stratification; however an understanding of the atmospheric processes leading to low-level cloud dissipation and formation events is limited. A method to identify clear periods at Utq...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-21-4149-2021 https://doaj.org/article/9721410f04874f51bd6c0b8e7160ef7b |
id |
ftdoajarticles:oai:doaj.org/article:9721410f04874f51bd6c0b8e7160ef7b |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:9721410f04874f51bd6c0b8e7160ef7b 2023-05-15T15:39:41+02:00 Processes contributing to cloud dissipation and formation events on the North Slope of Alaska J. Sedlar A. Igel H. Telg 2021-03-01T00:00:00Z https://doi.org/10.5194/acp-21-4149-2021 https://doaj.org/article/9721410f04874f51bd6c0b8e7160ef7b EN eng Copernicus Publications https://acp.copernicus.org/articles/21/4149/2021/acp-21-4149-2021.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-21-4149-2021 1680-7316 1680-7324 https://doaj.org/article/9721410f04874f51bd6c0b8e7160ef7b Atmospheric Chemistry and Physics, Vol 21, Pp 4149-4167 (2021) Physics QC1-999 Chemistry QD1-999 article 2021 ftdoajarticles https://doi.org/10.5194/acp-21-4149-2021 2022-12-31T13:46:05Z Clear-sky periods across the high latitudes have profound impacts on the surface energy budget and lower atmospheric stratification; however an understanding of the atmospheric processes leading to low-level cloud dissipation and formation events is limited. A method to identify clear periods at Utqiaġvik (formerly Barrow), Alaska, during a 5-year period (2014–2018) is developed. A suite of remote sensing and in situ measurements from the high-latitude observatory are analyzed; we focus on comparing and contrasting atmospheric properties during low-level (below 2 km ) cloud dissipation and formation events to understand the processes controlling clear-sky periods. Vertical profiles of lidar backscatter suggest that aerosol presence across the lower atmosphere is relatively invariant during the periods bookending clear conditions, which suggests that a sparsity of aerosol is not frequently a cause for cloud dissipation on the North Slope of Alaska. Further, meteorological analysis indicates two active processes ongoing that appear to support the formation of low clouds after a clear-sky period: namely, horizontal advection, which was dominant in winter and early spring, and quiescent air mass modification, which was dominant in the summer. During summer, the dominant mode of cloud formation is a low cloud or fog layer developing near the surface. This low cloud formation is driven largely by air mass modification under relatively quiescent synoptic conditions. Near-surface aerosol particles concentrations changed by a factor of 2 around summer formation events. Thermodynamic adjustment and increased aerosol presence under quiescent atmospheric conditions are hypothesized as important mechanisms for fog formation. Article in Journal/Newspaper Barrow north slope Alaska Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 21 5 4149 4167 |
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 J. Sedlar A. Igel H. Telg Processes contributing to cloud dissipation and formation events on the North Slope of Alaska |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Clear-sky periods across the high latitudes have profound impacts on the surface energy budget and lower atmospheric stratification; however an understanding of the atmospheric processes leading to low-level cloud dissipation and formation events is limited. A method to identify clear periods at Utqiaġvik (formerly Barrow), Alaska, during a 5-year period (2014–2018) is developed. A suite of remote sensing and in situ measurements from the high-latitude observatory are analyzed; we focus on comparing and contrasting atmospheric properties during low-level (below 2 km ) cloud dissipation and formation events to understand the processes controlling clear-sky periods. Vertical profiles of lidar backscatter suggest that aerosol presence across the lower atmosphere is relatively invariant during the periods bookending clear conditions, which suggests that a sparsity of aerosol is not frequently a cause for cloud dissipation on the North Slope of Alaska. Further, meteorological analysis indicates two active processes ongoing that appear to support the formation of low clouds after a clear-sky period: namely, horizontal advection, which was dominant in winter and early spring, and quiescent air mass modification, which was dominant in the summer. During summer, the dominant mode of cloud formation is a low cloud or fog layer developing near the surface. This low cloud formation is driven largely by air mass modification under relatively quiescent synoptic conditions. Near-surface aerosol particles concentrations changed by a factor of 2 around summer formation events. Thermodynamic adjustment and increased aerosol presence under quiescent atmospheric conditions are hypothesized as important mechanisms for fog formation. |
format |
Article in Journal/Newspaper |
author |
J. Sedlar A. Igel H. Telg |
author_facet |
J. Sedlar A. Igel H. Telg |
author_sort |
J. Sedlar |
title |
Processes contributing to cloud dissipation and formation events on the North Slope of Alaska |
title_short |
Processes contributing to cloud dissipation and formation events on the North Slope of Alaska |
title_full |
Processes contributing to cloud dissipation and formation events on the North Slope of Alaska |
title_fullStr |
Processes contributing to cloud dissipation and formation events on the North Slope of Alaska |
title_full_unstemmed |
Processes contributing to cloud dissipation and formation events on the North Slope of Alaska |
title_sort |
processes contributing to cloud dissipation and formation events on the north slope of alaska |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-21-4149-2021 https://doaj.org/article/9721410f04874f51bd6c0b8e7160ef7b |
genre |
Barrow north slope Alaska |
genre_facet |
Barrow north slope Alaska |
op_source |
Atmospheric Chemistry and Physics, Vol 21, Pp 4149-4167 (2021) |
op_relation |
https://acp.copernicus.org/articles/21/4149/2021/acp-21-4149-2021.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-21-4149-2021 1680-7316 1680-7324 https://doaj.org/article/9721410f04874f51bd6c0b8e7160ef7b |
op_doi |
https://doi.org/10.5194/acp-21-4149-2021 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
21 |
container_issue |
5 |
container_start_page |
4149 |
op_container_end_page |
4167 |
_version_ |
1766371722914693120 |