Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign
Measurements from four case studies in spring and summer-time Arctic stratocumulus clouds during the Aerosol-Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) campaign are presented. We compare microphysics observations between cases and with previous measurements made in the Arctic an...
Published in: | Atmospheric Chemistry and Physics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2015
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Online Access: | https://research.manchester.ac.uk/en/publications/d1723a06-2919-4981-88c5-cdb05296f7e8 https://doi.org/10.5194/acp-15-3719-2015 |
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ftumanchesterpub:oai:pure.atira.dk:publications/d1723a06-2919-4981-88c5-cdb05296f7e8 2023-11-12T04:02:34+01:00 Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign Lloyd, Gary Choularton, Thomas Bower, Keith Crosier, Jonathan Jones, H. Dorsey, James Gallagher, M.W. Connolly, Paul Kirchgaessner, A.C.R. Lachlan-Cope, T. 2015-04-02 https://research.manchester.ac.uk/en/publications/d1723a06-2919-4981-88c5-cdb05296f7e8 https://doi.org/10.5194/acp-15-3719-2015 eng eng info:eu-repo/semantics/openAccess Lloyd , G , Choularton , T , Bower , K , Crosier , J , Jones , H , Dorsey , J , Gallagher , M W , Connolly , P , Kirchgaessner , A C R & Lachlan-Cope , T 2015 , ' Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign ' , Atmospheric Chemistry and Physics , vol. 15 , pp. 3719-3737 . https://doi.org/10.5194/acp-15-3719-2015 , https://doi.org/10.5194/acp-15-3719-2015 article 2015 ftumanchesterpub https://doi.org/10.5194/acp-15-3719-2015 2023-10-30T09:15:29Z Measurements from four case studies in spring and summer-time Arctic stratocumulus clouds during the Aerosol-Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) campaign are presented. We compare microphysics observations between cases and with previous measurements made in the Arctic and Antarctic. During ACCACIA, stratocumulus clouds were observed to consist of liquid at cloud tops, often at distinct temperature inversions. The cloud top regions precipitated low concentrations of ice into the cloud below. During the spring cases median ice number concentrations (~ 0.5 L−1) were found to be lower by about a factor of 5 than observations from the summer campaign (~ 3 L−1). Cloud layers in the summer spanned a warmer temperature regime than in the spring and enhancement of ice concentrations in these cases was found to be due to secondary ice production through the Hallett–Mossop (H–M) process. Aerosol concentrations during spring ranged from ~ 300–400 cm−3 in one case to lower values of ~ 50–100 cm−3 in the other. The concentration of aerosol with sizes Dp > 0.5 μm was used in a primary ice nucleus (IN) prediction scheme (DeMott et al., 2010). Predicted IN values varied depending on aerosol measurement periods but were generally greater than maximum observed median values of ice crystal concentrations in the spring cases, and less than the observed ice concentrations in the summer due to the influence of secondary ice production. Comparison with recent cloud observations in the Antarctic summer (Grosvenor et al., 2012), reveals lower ice concentrations in Antarctic clouds in comparable seasons. An enhancement of ice crystal number concentrations (when compared with predicted IN numbers) was also found in Antarctic stratocumulus clouds spanning the H–M temperature zone; however, concentrations were about an order of magnitude lower than those observed in the Arctic summer cases but were similar to the peak values observed in the colder Arctic spring cases, where the H–M mechanism did not operate. Article in Journal/Newspaper Antarc* Antarctic Arctic Arctic The University of Manchester: Research Explorer Antarctic Arctic Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) The Antarctic Atmospheric Chemistry and Physics 15 7 3719 3737 |
institution |
Open Polar |
collection |
The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
description |
Measurements from four case studies in spring and summer-time Arctic stratocumulus clouds during the Aerosol-Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) campaign are presented. We compare microphysics observations between cases and with previous measurements made in the Arctic and Antarctic. During ACCACIA, stratocumulus clouds were observed to consist of liquid at cloud tops, often at distinct temperature inversions. The cloud top regions precipitated low concentrations of ice into the cloud below. During the spring cases median ice number concentrations (~ 0.5 L−1) were found to be lower by about a factor of 5 than observations from the summer campaign (~ 3 L−1). Cloud layers in the summer spanned a warmer temperature regime than in the spring and enhancement of ice concentrations in these cases was found to be due to secondary ice production through the Hallett–Mossop (H–M) process. Aerosol concentrations during spring ranged from ~ 300–400 cm−3 in one case to lower values of ~ 50–100 cm−3 in the other. The concentration of aerosol with sizes Dp > 0.5 μm was used in a primary ice nucleus (IN) prediction scheme (DeMott et al., 2010). Predicted IN values varied depending on aerosol measurement periods but were generally greater than maximum observed median values of ice crystal concentrations in the spring cases, and less than the observed ice concentrations in the summer due to the influence of secondary ice production. Comparison with recent cloud observations in the Antarctic summer (Grosvenor et al., 2012), reveals lower ice concentrations in Antarctic clouds in comparable seasons. An enhancement of ice crystal number concentrations (when compared with predicted IN numbers) was also found in Antarctic stratocumulus clouds spanning the H–M temperature zone; however, concentrations were about an order of magnitude lower than those observed in the Arctic summer cases but were similar to the peak values observed in the colder Arctic spring cases, where the H–M mechanism did not operate. |
format |
Article in Journal/Newspaper |
author |
Lloyd, Gary Choularton, Thomas Bower, Keith Crosier, Jonathan Jones, H. Dorsey, James Gallagher, M.W. Connolly, Paul Kirchgaessner, A.C.R. Lachlan-Cope, T. |
spellingShingle |
Lloyd, Gary Choularton, Thomas Bower, Keith Crosier, Jonathan Jones, H. Dorsey, James Gallagher, M.W. Connolly, Paul Kirchgaessner, A.C.R. Lachlan-Cope, T. Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign |
author_facet |
Lloyd, Gary Choularton, Thomas Bower, Keith Crosier, Jonathan Jones, H. Dorsey, James Gallagher, M.W. Connolly, Paul Kirchgaessner, A.C.R. Lachlan-Cope, T. |
author_sort |
Lloyd, Gary |
title |
Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign |
title_short |
Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign |
title_full |
Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign |
title_fullStr |
Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign |
title_full_unstemmed |
Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign |
title_sort |
observations and comparisons of cloud microphysical properties in spring and summertime arctic stratocumulus clouds during the accacia campaign |
publishDate |
2015 |
url |
https://research.manchester.ac.uk/en/publications/d1723a06-2919-4981-88c5-cdb05296f7e8 https://doi.org/10.5194/acp-15-3719-2015 |
long_lat |
ENVELOPE(170.217,170.217,-72.317,-72.317) |
geographic |
Antarctic Arctic Hallett The Antarctic |
geographic_facet |
Antarctic Arctic Hallett The Antarctic |
genre |
Antarc* Antarctic Arctic Arctic |
genre_facet |
Antarc* Antarctic Arctic Arctic |
op_source |
Lloyd , G , Choularton , T , Bower , K , Crosier , J , Jones , H , Dorsey , J , Gallagher , M W , Connolly , P , Kirchgaessner , A C R & Lachlan-Cope , T 2015 , ' Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus clouds during the ACCACIA campaign ' , Atmospheric Chemistry and Physics , vol. 15 , pp. 3719-3737 . https://doi.org/10.5194/acp-15-3719-2015 , https://doi.org/10.5194/acp-15-3719-2015 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-15-3719-2015 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
15 |
container_issue |
7 |
container_start_page |
3719 |
op_container_end_page |
3737 |
_version_ |
1782334700566609920 |