Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization
Comprehensive aircraft observations are used to characterise surface roughness over the Arctic marginal ice zone (MIZ) and consequently make recommendations for the parametrisation of surface momentum exchange in the MIZ. These observations were gathered in the Barents Sea and Fram Strait from two a...
Published in: | Atmospheric Chemistry and Physics |
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European Geosciences Union (EGU)
2016
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Online Access: | https://eprints.whiterose.ac.uk/94961/ https://eprints.whiterose.ac.uk/94961/1/Elvidge_2016_ACP-16-1545-2016.pdf https://doi.org/10.5194/acp-16-1545-2016 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:94961 2023-05-15T13:11:41+02:00 Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization Elvidge, AD Renfrew, IA Weiss, AI Brooks, IM Lachlan-Cope, TA King, JC 2016-01-15 text https://eprints.whiterose.ac.uk/94961/ https://eprints.whiterose.ac.uk/94961/1/Elvidge_2016_ACP-16-1545-2016.pdf https://doi.org/10.5194/acp-16-1545-2016 en eng European Geosciences Union (EGU) https://eprints.whiterose.ac.uk/94961/1/Elvidge_2016_ACP-16-1545-2016.pdf Elvidge, AD, Renfrew, IA, Weiss, AI et al. (3 more authors) (2016) Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization. Atmospheric Chemistry and Physics, 16. pp. 1545-1563. ISSN 1680-7316 Article NonPeerReviewed 2016 ftleedsuniv https://doi.org/10.5194/acp-16-1545-2016 2023-01-30T21:38:55Z Comprehensive aircraft observations are used to characterise surface roughness over the Arctic marginal ice zone (MIZ) and consequently make recommendations for the parametrisation of surface momentum exchange in the MIZ. These observations were gathered in the Barents Sea and Fram Strait from two aircraft as part of the Aerosol–Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) project. They represent a doubling of the total number of such aircraft observations currently available over the Arctic MIZ. The eddy covariance method is used to derive estimates of the 10 m neutral drag coefficient (CDN10) from turbulent wind velocity measurements, and a novel method using albedo and surface temperature is employed to derive ice fraction. Peak surface roughness is found at ice fractions in the range 0.6 to 0.8 (with a mean interquartile range in CDN10 of 1.25 to 2.85 × 10−3). CDN10 as a function of ice fraction is found to be well approximated by the negatively skewed distribution provided by a leading parametrisation scheme (Lüpkes et al., 2012) tailored for sea-ice drag over the MIZ in which the two constituent components of drag – skin and form drag – are separately quantified. Current parametrisation schemes used in the weather and climate models are compared with our results and the majority are found to be physically unjustified and unrepresentative. The Lüpkes et al. (2012) scheme is recommended in a computationally simple form, with adjusted parameter settings. A good agreement holds for subsets of the data from different locations, despite differences in sea-ice conditions. Ice conditions in the Barents Sea, characterised by small, unconsolidated ice floes, are found to be associated with higher CDN10 values – especially at the higher ice fractions – than those of Fram Strait, where typically larger, smoother floes are observed. Consequently, the important influence of sea-ice morphology and floe size on surface roughness is recognised, and improvement in the representation of this in ... Article in Journal/Newspaper albedo Arctic Barents Sea Fram Strait Sea ice White Rose Research Online (Universities of Leeds, Sheffield & York) Arctic Barents Sea Atmospheric Chemistry and Physics 16 3 1545 1563 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Comprehensive aircraft observations are used to characterise surface roughness over the Arctic marginal ice zone (MIZ) and consequently make recommendations for the parametrisation of surface momentum exchange in the MIZ. These observations were gathered in the Barents Sea and Fram Strait from two aircraft as part of the Aerosol–Cloud Coupling And Climate Interactions in the Arctic (ACCACIA) project. They represent a doubling of the total number of such aircraft observations currently available over the Arctic MIZ. The eddy covariance method is used to derive estimates of the 10 m neutral drag coefficient (CDN10) from turbulent wind velocity measurements, and a novel method using albedo and surface temperature is employed to derive ice fraction. Peak surface roughness is found at ice fractions in the range 0.6 to 0.8 (with a mean interquartile range in CDN10 of 1.25 to 2.85 × 10−3). CDN10 as a function of ice fraction is found to be well approximated by the negatively skewed distribution provided by a leading parametrisation scheme (Lüpkes et al., 2012) tailored for sea-ice drag over the MIZ in which the two constituent components of drag – skin and form drag – are separately quantified. Current parametrisation schemes used in the weather and climate models are compared with our results and the majority are found to be physically unjustified and unrepresentative. The Lüpkes et al. (2012) scheme is recommended in a computationally simple form, with adjusted parameter settings. A good agreement holds for subsets of the data from different locations, despite differences in sea-ice conditions. Ice conditions in the Barents Sea, characterised by small, unconsolidated ice floes, are found to be associated with higher CDN10 values – especially at the higher ice fractions – than those of Fram Strait, where typically larger, smoother floes are observed. Consequently, the important influence of sea-ice morphology and floe size on surface roughness is recognised, and improvement in the representation of this in ... |
format |
Article in Journal/Newspaper |
author |
Elvidge, AD Renfrew, IA Weiss, AI Brooks, IM Lachlan-Cope, TA King, JC |
spellingShingle |
Elvidge, AD Renfrew, IA Weiss, AI Brooks, IM Lachlan-Cope, TA King, JC Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
author_facet |
Elvidge, AD Renfrew, IA Weiss, AI Brooks, IM Lachlan-Cope, TA King, JC |
author_sort |
Elvidge, AD |
title |
Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
title_short |
Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
title_full |
Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
title_fullStr |
Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
title_full_unstemmed |
Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
title_sort |
observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization |
publisher |
European Geosciences Union (EGU) |
publishDate |
2016 |
url |
https://eprints.whiterose.ac.uk/94961/ https://eprints.whiterose.ac.uk/94961/1/Elvidge_2016_ACP-16-1545-2016.pdf https://doi.org/10.5194/acp-16-1545-2016 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
albedo Arctic Barents Sea Fram Strait Sea ice |
genre_facet |
albedo Arctic Barents Sea Fram Strait Sea ice |
op_relation |
https://eprints.whiterose.ac.uk/94961/1/Elvidge_2016_ACP-16-1545-2016.pdf Elvidge, AD, Renfrew, IA, Weiss, AI et al. (3 more authors) (2016) Observations of surface momentum exchange over the marginal-ice-zone and recommendations for its parameterization. Atmospheric Chemistry and Physics, 16. pp. 1545-1563. ISSN 1680-7316 |
op_doi |
https://doi.org/10.5194/acp-16-1545-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
3 |
container_start_page |
1545 |
op_container_end_page |
1563 |
_version_ |
1766248511308824576 |