Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models
Aircraft observations from two Arctic field campaigns are used to characterize and model surface heat and moisture exchange over the marginal ice zone (MIZ). We show that the surface roughness lengths for heat and moisture over uninterrupted sea ice vary with roughness Reynolds number ((Formula pres...
Published in: | Journal of Geophysical Research: Atmospheres |
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2021
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:80976 2023-05-15T15:00:54+02:00 Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models Elvidge, Andrew D. Renfrew, Ian A. Brooks, Ian M. Srivastava, Piyush Yelland, Margaret J. Prytherch, John 2021-09 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/80976/ https://ueaeprints.uea.ac.uk/id/eprint/80976/1/Accepted_Manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/80976/2/Published_Version.pdf https://doi.org/10.1029/2021JD034827 en eng https://ueaeprints.uea.ac.uk/id/eprint/80976/1/Accepted_Manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/80976/2/Published_Version.pdf Elvidge, Andrew D., Renfrew, Ian A., Brooks, Ian M., Srivastava, Piyush, Yelland, Margaret J. and Prytherch, John (2021) Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models. Journal of Geophysical Research: Atmospheres, 126 (17). ISSN 2169-897X doi:10.1029/2021JD034827 cc_by Article PeerReviewed 2021 ftuniveastangl https://doi.org/10.1029/2021JD034827 2023-03-23T23:32:50Z Aircraft observations from two Arctic field campaigns are used to characterize and model surface heat and moisture exchange over the marginal ice zone (MIZ). We show that the surface roughness lengths for heat and moisture over uninterrupted sea ice vary with roughness Reynolds number ((Formula presented.); itself a function of the roughness length for momentum, (Formula presented.), and surface wind stress), with a peak at the transition between aerodynamically smooth ((Formula presented.) <0.135) and aerodynamically rough ((Formula presented.) >2.5) regimes. A pre-existing theoretical model based on surface-renewal theory accurately reproduces this peak, in contrast to the simple parameterizations currently employed in two state-of-the-art numerical weather prediction models, which are insensitive to (Formula presented.). We propose a new, simple parameterization for surface exchange over the MIZ that blends this theoretical model for sea ice with surface exchange over water as a function of sea ice concentration. In offline tests, this new scheme performs much better than the existing schemes for the rough conditions observed during the ‘Iceland Greenland Seas Project’ field campaign. The bias in total turbulent heat flux across the MIZ is reduced to only 13 W m −2 for the new scheme, from 48 and 80 W m −2 for the Met Office Unified Model and ECMWF Integrated Forecast System schemes, respectively. It also performs marginally better for the comparatively smooth conditions observed during the ‘Aerosol-Cloud Coupling and Climate Interactions in the Arctic’ field campaign. The new surface exchange scheme has the benefit of being physically-motivated, comparatively accurate and straightforward to implement, although to reap the full benefits an improvement to the representation of sea ice topography via (Formula presented.) is required. Article in Journal/Newspaper Arctic Greenland Iceland Sea ice University of East Anglia: UEA Digital Repository Arctic Greenland Journal of Geophysical Research: Atmospheres 126 17 |
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Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
Aircraft observations from two Arctic field campaigns are used to characterize and model surface heat and moisture exchange over the marginal ice zone (MIZ). We show that the surface roughness lengths for heat and moisture over uninterrupted sea ice vary with roughness Reynolds number ((Formula presented.); itself a function of the roughness length for momentum, (Formula presented.), and surface wind stress), with a peak at the transition between aerodynamically smooth ((Formula presented.) <0.135) and aerodynamically rough ((Formula presented.) >2.5) regimes. A pre-existing theoretical model based on surface-renewal theory accurately reproduces this peak, in contrast to the simple parameterizations currently employed in two state-of-the-art numerical weather prediction models, which are insensitive to (Formula presented.). We propose a new, simple parameterization for surface exchange over the MIZ that blends this theoretical model for sea ice with surface exchange over water as a function of sea ice concentration. In offline tests, this new scheme performs much better than the existing schemes for the rough conditions observed during the ‘Iceland Greenland Seas Project’ field campaign. The bias in total turbulent heat flux across the MIZ is reduced to only 13 W m −2 for the new scheme, from 48 and 80 W m −2 for the Met Office Unified Model and ECMWF Integrated Forecast System schemes, respectively. It also performs marginally better for the comparatively smooth conditions observed during the ‘Aerosol-Cloud Coupling and Climate Interactions in the Arctic’ field campaign. The new surface exchange scheme has the benefit of being physically-motivated, comparatively accurate and straightforward to implement, although to reap the full benefits an improvement to the representation of sea ice topography via (Formula presented.) is required. |
format |
Article in Journal/Newspaper |
author |
Elvidge, Andrew D. Renfrew, Ian A. Brooks, Ian M. Srivastava, Piyush Yelland, Margaret J. Prytherch, John |
spellingShingle |
Elvidge, Andrew D. Renfrew, Ian A. Brooks, Ian M. Srivastava, Piyush Yelland, Margaret J. Prytherch, John Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
author_facet |
Elvidge, Andrew D. Renfrew, Ian A. Brooks, Ian M. Srivastava, Piyush Yelland, Margaret J. Prytherch, John |
author_sort |
Elvidge, Andrew D. |
title |
Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
title_short |
Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
title_full |
Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
title_fullStr |
Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
title_full_unstemmed |
Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
title_sort |
surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models |
publishDate |
2021 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/80976/ https://ueaeprints.uea.ac.uk/id/eprint/80976/1/Accepted_Manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/80976/2/Published_Version.pdf https://doi.org/10.1029/2021JD034827 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Iceland Sea ice |
genre_facet |
Arctic Greenland Iceland Sea ice |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/80976/1/Accepted_Manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/80976/2/Published_Version.pdf Elvidge, Andrew D., Renfrew, Ian A., Brooks, Ian M., Srivastava, Piyush, Yelland, Margaret J. and Prytherch, John (2021) Surface heat and moisture exchange in the marginal ice zone: observations and a new parameterization scheme for weather and climate models. Journal of Geophysical Research: Atmospheres, 126 (17). ISSN 2169-897X doi:10.1029/2021JD034827 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.1029/2021JD034827 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
17 |
_version_ |
1766332952845746176 |