The performance of a global and mesoscale model over the central Arctic Ocean during late summer
Measurements of turbulent fluxes, clouds, radiation, and profiles of mean meteorological parameters, obtained over an ice floe in the central Arctic Ocean during the Arctic Ocean Experiment 2001, are used to evaluate the performance of U.K. Met Office Unified Model (MetUM) and Coupled Ocean/Atmosphe...
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Language: | English |
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American Geophysical Union
2009
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Online Access: | https://eprints.whiterose.ac.uk/77223/ https://eprints.whiterose.ac.uk/77223/11/Birch_2009_JGR_2008JD010790-1_with_coversheet.pdf https://doi.org/10.1029/2008JD010790 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:77223 2024-06-02T07:54:30+00:00 The performance of a global and mesoscale model over the central Arctic Ocean during late summer Birch, CE Brooks, IM Tjernstrom, M Milton, SF Earnshaw, P Soderberg, S Persson, POG 2009-07-16 text https://eprints.whiterose.ac.uk/77223/ https://eprints.whiterose.ac.uk/77223/11/Birch_2009_JGR_2008JD010790-1_with_coversheet.pdf https://doi.org/10.1029/2008JD010790 en eng American Geophysical Union https://eprints.whiterose.ac.uk/77223/11/Birch_2009_JGR_2008JD010790-1_with_coversheet.pdf Birch, CE, Brooks, IM, Tjernstrom, M et al. (4 more authors) (2009) The performance of a global and mesoscale model over the central Arctic Ocean during late summer. Journal of Geophysical Research D: Atmospheres, 114 (13). D13104. 1 - 19. ISSN 0148-0227 Article NonPeerReviewed 2009 ftleedsuniv https://doi.org/10.1029/2008JD010790 2024-05-06T12:40:54Z Measurements of turbulent fluxes, clouds, radiation, and profiles of mean meteorological parameters, obtained over an ice floe in the central Arctic Ocean during the Arctic Ocean Experiment 2001, are used to evaluate the performance of U.K. Met Office Unified Model (MetUM) and Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) in the lower atmosphere during late summer. Both the latest version of the MetUM and the version operational in 2001 are used in the comparison to gain an insight as to whether updates to the model have improved its performance over the Arctic region. As with previous model evaluations over the Arctic, the pressure, humidity, and wind fields are satisfactorily represented in all three models. The older version of the MetUM underpredicts the occurrence of low-level Arctic clouds, and the liquid and ice cloud water partitioning is inaccurate compared to observations made during SHEBA. In the newer version, simulated ice and liquid water paths are improved, but the occurrence of low-level clouds are overpredicted. Both versions overestimate the amount of radiative heat absorbed at the surface, leading to a significant feedback of errors involving the surface albedo, which causes a large positive bias the surface temperature. Cloud forcing in COAMPS produces similar biases in the downwelling shortwave and longwave radiation fluxes to those produced by UM(G25). The surface albedo parameterization is, however, more realistic, and thus, the total heat flux and surface temperature are more accurate for the majority of the observation period. Article in Journal/Newspaper albedo Arctic Arctic Arctic Ocean White Rose Research Online (Universities of Leeds, Sheffield & York) Arctic Arctic Ocean Journal of Geophysical Research 114 D13 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Measurements of turbulent fluxes, clouds, radiation, and profiles of mean meteorological parameters, obtained over an ice floe in the central Arctic Ocean during the Arctic Ocean Experiment 2001, are used to evaluate the performance of U.K. Met Office Unified Model (MetUM) and Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) in the lower atmosphere during late summer. Both the latest version of the MetUM and the version operational in 2001 are used in the comparison to gain an insight as to whether updates to the model have improved its performance over the Arctic region. As with previous model evaluations over the Arctic, the pressure, humidity, and wind fields are satisfactorily represented in all three models. The older version of the MetUM underpredicts the occurrence of low-level Arctic clouds, and the liquid and ice cloud water partitioning is inaccurate compared to observations made during SHEBA. In the newer version, simulated ice and liquid water paths are improved, but the occurrence of low-level clouds are overpredicted. Both versions overestimate the amount of radiative heat absorbed at the surface, leading to a significant feedback of errors involving the surface albedo, which causes a large positive bias the surface temperature. Cloud forcing in COAMPS produces similar biases in the downwelling shortwave and longwave radiation fluxes to those produced by UM(G25). The surface albedo parameterization is, however, more realistic, and thus, the total heat flux and surface temperature are more accurate for the majority of the observation period. |
format |
Article in Journal/Newspaper |
author |
Birch, CE Brooks, IM Tjernstrom, M Milton, SF Earnshaw, P Soderberg, S Persson, POG |
spellingShingle |
Birch, CE Brooks, IM Tjernstrom, M Milton, SF Earnshaw, P Soderberg, S Persson, POG The performance of a global and mesoscale model over the central Arctic Ocean during late summer |
author_facet |
Birch, CE Brooks, IM Tjernstrom, M Milton, SF Earnshaw, P Soderberg, S Persson, POG |
author_sort |
Birch, CE |
title |
The performance of a global and mesoscale model over the central Arctic Ocean during late summer |
title_short |
The performance of a global and mesoscale model over the central Arctic Ocean during late summer |
title_full |
The performance of a global and mesoscale model over the central Arctic Ocean during late summer |
title_fullStr |
The performance of a global and mesoscale model over the central Arctic Ocean during late summer |
title_full_unstemmed |
The performance of a global and mesoscale model over the central Arctic Ocean during late summer |
title_sort |
performance of a global and mesoscale model over the central arctic ocean during late summer |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
https://eprints.whiterose.ac.uk/77223/ https://eprints.whiterose.ac.uk/77223/11/Birch_2009_JGR_2008JD010790-1_with_coversheet.pdf https://doi.org/10.1029/2008JD010790 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
albedo Arctic Arctic Arctic Ocean |
genre_facet |
albedo Arctic Arctic Arctic Ocean |
op_relation |
https://eprints.whiterose.ac.uk/77223/11/Birch_2009_JGR_2008JD010790-1_with_coversheet.pdf Birch, CE, Brooks, IM, Tjernstrom, M et al. (4 more authors) (2009) The performance of a global and mesoscale model over the central Arctic Ocean during late summer. Journal of Geophysical Research D: Atmospheres, 114 (13). D13104. 1 - 19. ISSN 0148-0227 |
op_doi |
https://doi.org/10.1029/2008JD010790 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
D13 |
_version_ |
1800740726629203968 |