Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution
A nonhydrostatic model (NH3D) is used for idealized dry quasi 2-D simulations of Arctic cold-air outbreaks using horizontal grid spacings between 1.25 and 60 km. Despite the idealized setup, the model results agree well with observations over Fram Strait. It is shown that an important characteristic...
Published in: | Journal of Geophysical Research: Atmospheres |
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American Geophysical Union
2013
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Online Access: | https://epic.awi.de/id/eprint/33500/ https://epic.awi.de/id/eprint/33500/1/jgrd50679-p.pdf http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50679/abstract;jsessionid=F40EBF4093D42C1A619CEC70F954DD3C.f04t03 https://hdl.handle.net/10013/epic.41904 https://hdl.handle.net/10013/epic.41904.d001 |
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ftawi:oai:epic.awi.de:33500 2024-09-15T18:07:04+00:00 Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution Chechin, Dmitry G. Lüpkes, Christof Repina, I. A. Gryanik, Vladimir M. 2013-08 application/pdf https://epic.awi.de/id/eprint/33500/ https://epic.awi.de/id/eprint/33500/1/jgrd50679-p.pdf http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50679/abstract;jsessionid=F40EBF4093D42C1A619CEC70F954DD3C.f04t03 https://hdl.handle.net/10013/epic.41904 https://hdl.handle.net/10013/epic.41904.d001 unknown American Geophysical Union https://epic.awi.de/id/eprint/33500/1/jgrd50679-p.pdf https://hdl.handle.net/10013/epic.41904.d001 Chechin, D. G. orcid:0000-0003-0021-9945 , Lüpkes, C. orcid:0000-0001-6518-0717 , Repina, I. A. and Gryanik, V. M. (2013) Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution , J. Geophys. Res. Atmospheres, 118 (16), pp. 8787-8813 . doi:10.1002/jgrd.50679 <https://doi.org/10.1002/jgrd.50679> , hdl:10013/epic.41904 EPIC3J. Geophys. Res. Atmospheres, American Geophysical Union, 118(16), pp. 8787-8813, ISSN: 2169-8996 Article isiRev 2013 ftawi https://doi.org/10.1002/jgrd.50679 2024-06-24T04:07:26Z A nonhydrostatic model (NH3D) is used for idealized dry quasi 2-D simulations of Arctic cold-air outbreaks using horizontal grid spacings between 1.25 and 60 km. Despite the idealized setup, the model results agree well with observations over Fram Strait. It is shown that an important characteristic of the flow regime during cold-air outbreaks is an ice-breeze jet (IBJ) with a maximum wind speed exceeding often the large-scale geostrophic wind speed. According to the present simulations, which agree very well with those of another nonhydrostatic mesoscale model (METRAS), the occurrence, strength, and horizontal extent L of this jet depend strongly on the external forcing and especially on the direction of the large-scale geostrophic wind relative to the orientation of the ice edge. The latter dependency is explained by the effects of the thermally induced geostrophic wind over open water and Coriolis force. It is found that coarse-resolution runs underestimate the strength of the jet. This underestimation has important consequences to the surface fluxes of heat and momentum, which are also underestimated by about 10–15% on average over the region between the ice edge and 120–180 km downstream. Our results suggest that a grid spacing of about L/7 is required (about 10–30 km) to simulate the IBJ strength with an accuracy of at least 10%. Thus, the results of large-scale models as well might contain uncertainties with regard to the simulated IBJ strength which would influence the energy budget in a large region along the marginal sea ice zones. Article in Journal/Newspaper Fram Strait Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research: Atmospheres 118 16 8787 8813 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A nonhydrostatic model (NH3D) is used for idealized dry quasi 2-D simulations of Arctic cold-air outbreaks using horizontal grid spacings between 1.25 and 60 km. Despite the idealized setup, the model results agree well with observations over Fram Strait. It is shown that an important characteristic of the flow regime during cold-air outbreaks is an ice-breeze jet (IBJ) with a maximum wind speed exceeding often the large-scale geostrophic wind speed. According to the present simulations, which agree very well with those of another nonhydrostatic mesoscale model (METRAS), the occurrence, strength, and horizontal extent L of this jet depend strongly on the external forcing and especially on the direction of the large-scale geostrophic wind relative to the orientation of the ice edge. The latter dependency is explained by the effects of the thermally induced geostrophic wind over open water and Coriolis force. It is found that coarse-resolution runs underestimate the strength of the jet. This underestimation has important consequences to the surface fluxes of heat and momentum, which are also underestimated by about 10–15% on average over the region between the ice edge and 120–180 km downstream. Our results suggest that a grid spacing of about L/7 is required (about 10–30 km) to simulate the IBJ strength with an accuracy of at least 10%. Thus, the results of large-scale models as well might contain uncertainties with regard to the simulated IBJ strength which would influence the energy budget in a large region along the marginal sea ice zones. |
format |
Article in Journal/Newspaper |
author |
Chechin, Dmitry G. Lüpkes, Christof Repina, I. A. Gryanik, Vladimir M. |
spellingShingle |
Chechin, Dmitry G. Lüpkes, Christof Repina, I. A. Gryanik, Vladimir M. Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
author_facet |
Chechin, Dmitry G. Lüpkes, Christof Repina, I. A. Gryanik, Vladimir M. |
author_sort |
Chechin, Dmitry G. |
title |
Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
title_short |
Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
title_full |
Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
title_fullStr |
Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
title_full_unstemmed |
Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
title_sort |
idealized dry quasi 2-d mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution |
publisher |
American Geophysical Union |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/33500/ https://epic.awi.de/id/eprint/33500/1/jgrd50679-p.pdf http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50679/abstract;jsessionid=F40EBF4093D42C1A619CEC70F954DD3C.f04t03 https://hdl.handle.net/10013/epic.41904 https://hdl.handle.net/10013/epic.41904.d001 |
genre |
Fram Strait Sea ice |
genre_facet |
Fram Strait Sea ice |
op_source |
EPIC3J. Geophys. Res. Atmospheres, American Geophysical Union, 118(16), pp. 8787-8813, ISSN: 2169-8996 |
op_relation |
https://epic.awi.de/id/eprint/33500/1/jgrd50679-p.pdf https://hdl.handle.net/10013/epic.41904.d001 Chechin, D. G. orcid:0000-0003-0021-9945 , Lüpkes, C. orcid:0000-0001-6518-0717 , Repina, I. A. and Gryanik, V. M. (2013) Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution , J. Geophys. Res. Atmospheres, 118 (16), pp. 8787-8813 . doi:10.1002/jgrd.50679 <https://doi.org/10.1002/jgrd.50679> , hdl:10013/epic.41904 |
op_doi |
https://doi.org/10.1002/jgrd.50679 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
118 |
container_issue |
16 |
container_start_page |
8787 |
op_container_end_page |
8813 |
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1810444444044886016 |