Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice
A new, simple parameterisation scheme for scalar (heat and moisture) exchange over sea ice and the marginal ice zone is tested in a numerical weather and climate prediction model. This new “Blended A87” scheme accounts for the influence of aerodynamic roughness on the relationship between momentum a...
Published in: | Journal of Advances in Modeling Earth Systems |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/90598/ https://ueaeprints.uea.ac.uk/id/eprint/90598/1/Elvidge_etal_2023_JAMES.pdf https://doi.org/10.1029/2022MS003305 |
id |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:90598 |
---|---|
record_format |
openpolar |
spelling |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:90598 2023-05-15T18:16:21+02:00 Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice Elvidge, Andrew D. Renfrew, Ian A. Edwards, John M. Brooks, Ian M. Srivastava, Piyush Weiss, Alexandra I. 2023-03 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/90598/ https://ueaeprints.uea.ac.uk/id/eprint/90598/1/Elvidge_etal_2023_JAMES.pdf https://doi.org/10.1029/2022MS003305 en eng https://ueaeprints.uea.ac.uk/id/eprint/90598/1/Elvidge_etal_2023_JAMES.pdf Elvidge, Andrew D., Renfrew, Ian A., Edwards, John M., Brooks, Ian M., Srivastava, Piyush and Weiss, Alexandra I. (2023) Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice. Journal of Advances in Modeling Earth Systems, 15 (3). ISSN 1942-2466 doi:10.1029/2022MS003305 cc_by Article PeerReviewed 2023 ftuniveastangl https://doi.org/10.1029/2022MS003305 2023-03-23T23:33:00Z A new, simple parameterisation scheme for scalar (heat and moisture) exchange over sea ice and the marginal ice zone is tested in a numerical weather and climate prediction model. This new “Blended A87” scheme accounts for the influence of aerodynamic roughness on the relationship between momentum and scalar exchange over consolidated sea ice, in line with long-standing theory and recent field observations, and in contrast to the crude schemes currently operational in most models. Using aircraft observations and Met Office Unified Model simulations of cold-air outbreak (CAO) conditions over aerodynamically rough sea ice, we demonstrate striking improvements in model performance when the Blended A87 scheme replaces the model’s operational treatment for surface scalar exchange, provided that the aerodynamic roughness over consolidated ice is appropriately prescribed. The mean biases in surface sensible heat flux, surface latent heat flux, near-surface air temperature and surface temperature reduce from 25 to 11 W m-2, 22 to 12 W m-2, 0.8 to 0.0 K, and 1.4 to 0.8 K, respectively. We demonstrate that such impacts on surface exchange over sea ice can have a marked impact on the evolution of the atmospheric boundary layer across hundreds of kilometres downwind of the sea ice during CAO conditions in the model. Our results highlight the importance of spatiotemporal variability in the topography of consolidated sea ice for both momentum and scalar exchange over sea ice; accounting for which remains a challenge for modelling polar weather and climate. Article in Journal/Newspaper Sea ice University of East Anglia: UEA Digital Repository Journal of Advances in Modeling Earth Systems 15 3 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
A new, simple parameterisation scheme for scalar (heat and moisture) exchange over sea ice and the marginal ice zone is tested in a numerical weather and climate prediction model. This new “Blended A87” scheme accounts for the influence of aerodynamic roughness on the relationship between momentum and scalar exchange over consolidated sea ice, in line with long-standing theory and recent field observations, and in contrast to the crude schemes currently operational in most models. Using aircraft observations and Met Office Unified Model simulations of cold-air outbreak (CAO) conditions over aerodynamically rough sea ice, we demonstrate striking improvements in model performance when the Blended A87 scheme replaces the model’s operational treatment for surface scalar exchange, provided that the aerodynamic roughness over consolidated ice is appropriately prescribed. The mean biases in surface sensible heat flux, surface latent heat flux, near-surface air temperature and surface temperature reduce from 25 to 11 W m-2, 22 to 12 W m-2, 0.8 to 0.0 K, and 1.4 to 0.8 K, respectively. We demonstrate that such impacts on surface exchange over sea ice can have a marked impact on the evolution of the atmospheric boundary layer across hundreds of kilometres downwind of the sea ice during CAO conditions in the model. Our results highlight the importance of spatiotemporal variability in the topography of consolidated sea ice for both momentum and scalar exchange over sea ice; accounting for which remains a challenge for modelling polar weather and climate. |
format |
Article in Journal/Newspaper |
author |
Elvidge, Andrew D. Renfrew, Ian A. Edwards, John M. Brooks, Ian M. Srivastava, Piyush Weiss, Alexandra I. |
spellingShingle |
Elvidge, Andrew D. Renfrew, Ian A. Edwards, John M. Brooks, Ian M. Srivastava, Piyush Weiss, Alexandra I. Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
author_facet |
Elvidge, Andrew D. Renfrew, Ian A. Edwards, John M. Brooks, Ian M. Srivastava, Piyush Weiss, Alexandra I. |
author_sort |
Elvidge, Andrew D. |
title |
Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
title_short |
Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
title_full |
Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
title_fullStr |
Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
title_full_unstemmed |
Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
title_sort |
improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice |
publishDate |
2023 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/90598/ https://ueaeprints.uea.ac.uk/id/eprint/90598/1/Elvidge_etal_2023_JAMES.pdf https://doi.org/10.1029/2022MS003305 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/90598/1/Elvidge_etal_2023_JAMES.pdf Elvidge, Andrew D., Renfrew, Ian A., Edwards, John M., Brooks, Ian M., Srivastava, Piyush and Weiss, Alexandra I. (2023) Improved simulation of the polar atmospheric boundary layer by accounting for aerodynamic roughness in the parameterisation of surface scalar exchange over sea ice. Journal of Advances in Modeling Earth Systems, 15 (3). ISSN 1942-2466 doi:10.1029/2022MS003305 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.1029/2022MS003305 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
15 |
container_issue |
3 |
_version_ |
1766189919269552128 |