Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model
Assessment of marine downscaling of global model simulations to the regional scale is a prerequisite for understanding ocean feedback to the atmosphere in regional climate downscaling. Major difficulties arise from the coarse grid resolution of global models, which cannot provide sufficiently accura...
Published in: | Tellus A: Dynamic Meteorology and Oceanography |
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Online Access: | https://epic.awi.de/id/eprint/35880/ https://epic.awi.de/id/eprint/35880/1/23927-128259-1-PB.pdf http://www.tellusa.net/index.php/tellusa/article/view/23927 https://hdl.handle.net/10013/epic.43792 https://hdl.handle.net/10013/epic.43792.d001 |
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ftawi:oai:epic.awi.de:35880 2023-05-15T17:25:19+02:00 Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model Su, Jian Sein, Dmitry V. Mathis, Moritz Mayer, Bernhard O'Driscoll, Kieran Chen, Xinping Mikolajewicz, Uwe Pohlmann, Thomas 2014-07-01 application/pdf https://epic.awi.de/id/eprint/35880/ https://epic.awi.de/id/eprint/35880/1/23927-128259-1-PB.pdf http://www.tellusa.net/index.php/tellusa/article/view/23927 https://hdl.handle.net/10013/epic.43792 https://hdl.handle.net/10013/epic.43792.d001 unknown Wiley https://epic.awi.de/id/eprint/35880/1/23927-128259-1-PB.pdf https://hdl.handle.net/10013/epic.43792.d001 Su, J. , Sein, D. V. orcid:0000-0002-1190-3622 , Mathis, M. , Mayer, B. , O'Driscoll, K. , Chen, X. , Mikolajewicz, U. and Pohlmann, T. (2014) Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model , Tellus A, 66 , p. 23927 . doi:10.3402/tellusa.v66.23927 <https://doi.org/10.3402/tellusa.v66.23927> , hdl:10013/epic.43792 EPIC3Tellus A, Wiley, 66, pp. 23927, ISSN: 0280-6495 Article isiRev 2014 ftawi https://doi.org/10.3402/tellusa.v66.23927 2021-12-24T15:39:40Z Assessment of marine downscaling of global model simulations to the regional scale is a prerequisite for understanding ocean feedback to the atmosphere in regional climate downscaling. Major difficulties arise from the coarse grid resolution of global models, which cannot provide sufficiently accurate boundary values for the regional model. In this study, we first setup a stretched global model (MPIOM) to focus on the North Sea by shifting poles. Second, a regional model (HAMSOM) was performed with higher resolution, while the open boundary values were provided by the stretched global model. In general, the sea surface temperatures (SSTs) in the two experiments are similar. Major SST differences are found in coastal regions (root mean square difference of SST is reaching up to 2°C). The higher sea surface salinity in coastal regions in the global model indicates the general limitation of this global model and its configuration (surface layer thickness is 16 m). By comparison, the advantage of the absence of open lateral boundaries in the global model can be demonstrated, in particular for the transition region between the North Sea and Baltic Sea. On long timescales, the North Atlantic Current (NAC) inflow through the northern boundary correlates well between both model simulations (R~0.9). After downscaling with HAMSOM, the NAC inflow through the northern boundary decreases by ~10%, but the circulation in the Skagerrak is stronger in HAMSOM. The circulation patterns of both models are similar in the northern North Sea. The comparison suggests that the stretched global model system is a suitable tool for long-term free climate model simulations, and the only limitations occur in coastal regions. Regarding the regional studies focusing on the coastal zone, nested regional model can be a helpful alternative. Article in Journal/Newspaper north atlantic current North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Tellus A: Dynamic Meteorology and Oceanography 66 1 23927 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Assessment of marine downscaling of global model simulations to the regional scale is a prerequisite for understanding ocean feedback to the atmosphere in regional climate downscaling. Major difficulties arise from the coarse grid resolution of global models, which cannot provide sufficiently accurate boundary values for the regional model. In this study, we first setup a stretched global model (MPIOM) to focus on the North Sea by shifting poles. Second, a regional model (HAMSOM) was performed with higher resolution, while the open boundary values were provided by the stretched global model. In general, the sea surface temperatures (SSTs) in the two experiments are similar. Major SST differences are found in coastal regions (root mean square difference of SST is reaching up to 2°C). The higher sea surface salinity in coastal regions in the global model indicates the general limitation of this global model and its configuration (surface layer thickness is 16 m). By comparison, the advantage of the absence of open lateral boundaries in the global model can be demonstrated, in particular for the transition region between the North Sea and Baltic Sea. On long timescales, the North Atlantic Current (NAC) inflow through the northern boundary correlates well between both model simulations (R~0.9). After downscaling with HAMSOM, the NAC inflow through the northern boundary decreases by ~10%, but the circulation in the Skagerrak is stronger in HAMSOM. The circulation patterns of both models are similar in the northern North Sea. The comparison suggests that the stretched global model system is a suitable tool for long-term free climate model simulations, and the only limitations occur in coastal regions. Regarding the regional studies focusing on the coastal zone, nested regional model can be a helpful alternative. |
format |
Article in Journal/Newspaper |
author |
Su, Jian Sein, Dmitry V. Mathis, Moritz Mayer, Bernhard O'Driscoll, Kieran Chen, Xinping Mikolajewicz, Uwe Pohlmann, Thomas |
spellingShingle |
Su, Jian Sein, Dmitry V. Mathis, Moritz Mayer, Bernhard O'Driscoll, Kieran Chen, Xinping Mikolajewicz, Uwe Pohlmann, Thomas Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model |
author_facet |
Su, Jian Sein, Dmitry V. Mathis, Moritz Mayer, Bernhard O'Driscoll, Kieran Chen, Xinping Mikolajewicz, Uwe Pohlmann, Thomas |
author_sort |
Su, Jian |
title |
Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model |
title_short |
Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model |
title_full |
Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model |
title_fullStr |
Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model |
title_full_unstemmed |
Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model |
title_sort |
assessment of a zoomed global model for the north sea by comparison with a conventional nested regional model |
publisher |
Wiley |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35880/ https://epic.awi.de/id/eprint/35880/1/23927-128259-1-PB.pdf http://www.tellusa.net/index.php/tellusa/article/view/23927 https://hdl.handle.net/10013/epic.43792 https://hdl.handle.net/10013/epic.43792.d001 |
genre |
north atlantic current North Atlantic |
genre_facet |
north atlantic current North Atlantic |
op_source |
EPIC3Tellus A, Wiley, 66, pp. 23927, ISSN: 0280-6495 |
op_relation |
https://epic.awi.de/id/eprint/35880/1/23927-128259-1-PB.pdf https://hdl.handle.net/10013/epic.43792.d001 Su, J. , Sein, D. V. orcid:0000-0002-1190-3622 , Mathis, M. , Mayer, B. , O'Driscoll, K. , Chen, X. , Mikolajewicz, U. and Pohlmann, T. (2014) Assessment of a zoomed global model for the North Sea by comparison with a conventional nested regional model , Tellus A, 66 , p. 23927 . doi:10.3402/tellusa.v66.23927 <https://doi.org/10.3402/tellusa.v66.23927> , hdl:10013/epic.43792 |
op_doi |
https://doi.org/10.3402/tellusa.v66.23927 |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
66 |
container_issue |
1 |
container_start_page |
23927 |
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1766116716623953920 |