Baroclinic low-level jets in Arctic marine cold-air outbreaks
An analytical model describing the evolution of a convective atmospheric boundary layer in marine cold-air outbreaks in the Arctic is presented. The novelty of the model is a detailed description of the baroclinicity associated with the boundary-layer growth and heating. Ekman friction is also taken...
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ftawi:oai:epic.awi.de:49089 2024-09-15T17:51:01+00:00 Baroclinic low-level jets in Arctic marine cold-air outbreaks Chechin, Dmitry Lüpkes, Christof 2019 https://epic.awi.de/id/eprint/49089/ https://hdl.handle.net/10013/epic.f8c9d361-7717-4fd3-b2cf-169c82638e7d unknown Chechin, D. and Lüpkes, C. orcid:0000-0001-6518-0717 (2019) Baroclinic low-level jets in Arctic marine cold-air outbreaks , IOP Conf. Series: Earth and Environmental Science, 231 . doi:10.1088/1755-1315/231/1/012011 <https://doi.org/10.1088/1755-1315%2F231%2F1%2F012011> , hdl:10013/epic.f8c9d361-7717-4fd3-b2cf-169c82638e7d EPIC3IOP Conf. Series: Earth and Environmental Science, 231 Article peerRev 2019 ftawi https://doi.org/10.1088/1755-1315/231/1/012011 2024-06-24T04:21:00Z An analytical model describing the evolution of a convective atmospheric boundary layer in marine cold-air outbreaks in the Arctic is presented. The novelty of the model is a detailed description of the baroclinicity associated with the boundary-layer growth and heating. Ekman friction is also taken into account. Thereby, the model describes the evolution of mixed- layer wind components over the ocean. It is shown theoretically that baroclinicity leads either to deceleration or to acceleration of the flow over the ocean, which depends on the direction of the large-scale flow relative to the orientation of the ice edge. Acceleration of the flow leads to a formation of a low-level jet strongly affecting the surface fluxes of heat and momentum. Baroclinicity and the magnitude of the low-level jet are strongest close to the ice edge being proportional to the ocean-ice temperature difference and decays further downwind. Horizontal decay of the low-level jet strength is governed by the airmass transformation length scale which is estimated to be in the order of 500-1000 km for typical cold-air outbreaks. The model solutions are shown to be in good agreement with aircraft observations over the Fram Strait and results of a numerical nonhydrostatic model. Article in Journal/Newspaper Arctic Fram Strait Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) IOP Conference Series: Earth and Environmental Science 231 012011 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
An analytical model describing the evolution of a convective atmospheric boundary layer in marine cold-air outbreaks in the Arctic is presented. The novelty of the model is a detailed description of the baroclinicity associated with the boundary-layer growth and heating. Ekman friction is also taken into account. Thereby, the model describes the evolution of mixed- layer wind components over the ocean. It is shown theoretically that baroclinicity leads either to deceleration or to acceleration of the flow over the ocean, which depends on the direction of the large-scale flow relative to the orientation of the ice edge. Acceleration of the flow leads to a formation of a low-level jet strongly affecting the surface fluxes of heat and momentum. Baroclinicity and the magnitude of the low-level jet are strongest close to the ice edge being proportional to the ocean-ice temperature difference and decays further downwind. Horizontal decay of the low-level jet strength is governed by the airmass transformation length scale which is estimated to be in the order of 500-1000 km for typical cold-air outbreaks. The model solutions are shown to be in good agreement with aircraft observations over the Fram Strait and results of a numerical nonhydrostatic model. |
format |
Article in Journal/Newspaper |
author |
Chechin, Dmitry Lüpkes, Christof |
spellingShingle |
Chechin, Dmitry Lüpkes, Christof Baroclinic low-level jets in Arctic marine cold-air outbreaks |
author_facet |
Chechin, Dmitry Lüpkes, Christof |
author_sort |
Chechin, Dmitry |
title |
Baroclinic low-level jets in Arctic marine cold-air outbreaks |
title_short |
Baroclinic low-level jets in Arctic marine cold-air outbreaks |
title_full |
Baroclinic low-level jets in Arctic marine cold-air outbreaks |
title_fullStr |
Baroclinic low-level jets in Arctic marine cold-air outbreaks |
title_full_unstemmed |
Baroclinic low-level jets in Arctic marine cold-air outbreaks |
title_sort |
baroclinic low-level jets in arctic marine cold-air outbreaks |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/49089/ https://hdl.handle.net/10013/epic.f8c9d361-7717-4fd3-b2cf-169c82638e7d |
genre |
Arctic Fram Strait |
genre_facet |
Arctic Fram Strait |
op_source |
EPIC3IOP Conf. Series: Earth and Environmental Science, 231 |
op_relation |
Chechin, D. and Lüpkes, C. orcid:0000-0001-6518-0717 (2019) Baroclinic low-level jets in Arctic marine cold-air outbreaks , IOP Conf. Series: Earth and Environmental Science, 231 . doi:10.1088/1755-1315/231/1/012011 <https://doi.org/10.1088/1755-1315%2F231%2F1%2F012011> , hdl:10013/epic.f8c9d361-7717-4fd3-b2cf-169c82638e7d |
op_doi |
https://doi.org/10.1088/1755-1315/231/1/012011 |
container_title |
IOP Conference Series: Earth and Environmental Science |
container_volume |
231 |
container_start_page |
012011 |
_version_ |
1810292815293317120 |