Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic
Many state-of-the-art coupled sea ice-ocean models use atmospheric and oceanic drag coefficients that are at best a function of the atmospheric stability but otherwise constant in time and space. Constant drag coefficients might lead to an incorrect representation of the ice-air and ice-ocean moment...
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Online Access: | https://epic.awi.de/id/eprint/57787/ https://epic.awi.de/id/eprint/57787/1/castellani-etal_deformation0.pdf https://hdl.handle.net/10013/epic.9f6e4954-81cc-46b9-9d96-78a944237976 |
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ftawi:oai:epic.awi.de:57787 2024-09-15T17:51:22+00:00 Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic Castellani, Giulia Losch, Martin Ungermann, Mischa Gerdes, Rüdiger 2018-08-01 application/pdf https://epic.awi.de/id/eprint/57787/ https://epic.awi.de/id/eprint/57787/1/castellani-etal_deformation0.pdf https://hdl.handle.net/10013/epic.9f6e4954-81cc-46b9-9d96-78a944237976 unknown Elsevier BV https://epic.awi.de/id/eprint/57787/1/castellani-etal_deformation0.pdf Castellani, G. , Losch, M. , Ungermann, M. and Gerdes, R. (2018) Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic , Ocean Modelling, 128 , pp. 48-66 . doi:10.1016/j.ocemod.2018.06.002 <https://doi.org/10.1016/j.ocemod.2018.06.002> , hdl:10013/epic.9f6e4954-81cc-46b9-9d96-78a944237976 EPIC3Ocean Modelling, Elsevier BV, 128, pp. 48-66, ISSN: 1463-5003 Article peerRev 2018 ftawi https://doi.org/10.1016/j.ocemod.2018.06.002 2024-06-24T04:30:12Z Many state-of-the-art coupled sea ice-ocean models use atmospheric and oceanic drag coefficients that are at best a function of the atmospheric stability but otherwise constant in time and space. Constant drag coefficients might lead to an incorrect representation of the ice-air and ice-ocean momentum exchange, since observations of turbulent fluxes imply high variability of drag coefficients. We compare three model runs, two with constant drag coefficients and one with drag coefficients varying as function of sea-ice characteristics. The computed drag coefficients range between 0.88 ×10−3 and 4.68 ×10−3 for the atmosphere, and between 1.28 ×10−3 and 13.68 ×10−3 for the ocean. They fall in the range of observed drag coefficients and illustrate the interplay of ice deformation and ice concentration in different seasons and regions. The introduction of variable drag coefficients improves the realism of the model simulation. In addition, using the average values of the variable drag coefficients improves simulations with constant drag coefficients. When drag coefficients depend on sea-ice characteristics, the average sea-ice drift speed in the Arctic basin increases from 6.22 cm s−1 to 6.64 cm s−1. This leads to a reduction of ice thickness in the entire Arctic and particularly in the Lincoln Sea with a mean value decreasing from 7.86 m to 6.62 m. Variable drag coefficients lead also to a deeper mixed layer in summer and to changes in surface salinity. Surface temperatures in the ocean are also affected by variable drag coefficients with differences of up to 0.06 °C in the East Siberian Sea. Small effects are visible in the ocean interior Article in Journal/Newspaper Arctic Arctic Basin East Siberian Sea Lincoln Sea Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Ocean Modelling 128 48 66 |
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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 |
Many state-of-the-art coupled sea ice-ocean models use atmospheric and oceanic drag coefficients that are at best a function of the atmospheric stability but otherwise constant in time and space. Constant drag coefficients might lead to an incorrect representation of the ice-air and ice-ocean momentum exchange, since observations of turbulent fluxes imply high variability of drag coefficients. We compare three model runs, two with constant drag coefficients and one with drag coefficients varying as function of sea-ice characteristics. The computed drag coefficients range between 0.88 ×10−3 and 4.68 ×10−3 for the atmosphere, and between 1.28 ×10−3 and 13.68 ×10−3 for the ocean. They fall in the range of observed drag coefficients and illustrate the interplay of ice deformation and ice concentration in different seasons and regions. The introduction of variable drag coefficients improves the realism of the model simulation. In addition, using the average values of the variable drag coefficients improves simulations with constant drag coefficients. When drag coefficients depend on sea-ice characteristics, the average sea-ice drift speed in the Arctic basin increases from 6.22 cm s−1 to 6.64 cm s−1. This leads to a reduction of ice thickness in the entire Arctic and particularly in the Lincoln Sea with a mean value decreasing from 7.86 m to 6.62 m. Variable drag coefficients lead also to a deeper mixed layer in summer and to changes in surface salinity. Surface temperatures in the ocean are also affected by variable drag coefficients with differences of up to 0.06 °C in the East Siberian Sea. Small effects are visible in the ocean interior |
format |
Article in Journal/Newspaper |
author |
Castellani, Giulia Losch, Martin Ungermann, Mischa Gerdes, Rüdiger |
spellingShingle |
Castellani, Giulia Losch, Martin Ungermann, Mischa Gerdes, Rüdiger Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic |
author_facet |
Castellani, Giulia Losch, Martin Ungermann, Mischa Gerdes, Rüdiger |
author_sort |
Castellani, Giulia |
title |
Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic |
title_short |
Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic |
title_full |
Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic |
title_fullStr |
Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic |
title_full_unstemmed |
Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic |
title_sort |
sea-ice drag as a function of deformation and ice cover: effects on simulated sea ice and ocean circulation in the arctic |
publisher |
Elsevier BV |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/57787/ https://epic.awi.de/id/eprint/57787/1/castellani-etal_deformation0.pdf https://hdl.handle.net/10013/epic.9f6e4954-81cc-46b9-9d96-78a944237976 |
genre |
Arctic Arctic Basin East Siberian Sea Lincoln Sea Sea ice |
genre_facet |
Arctic Arctic Basin East Siberian Sea Lincoln Sea Sea ice |
op_source |
EPIC3Ocean Modelling, Elsevier BV, 128, pp. 48-66, ISSN: 1463-5003 |
op_relation |
https://epic.awi.de/id/eprint/57787/1/castellani-etal_deformation0.pdf Castellani, G. , Losch, M. , Ungermann, M. and Gerdes, R. (2018) Sea-ice drag as a function of deformation and ice cover: Effects on simulated sea ice and ocean circulation in the Arctic , Ocean Modelling, 128 , pp. 48-66 . doi:10.1016/j.ocemod.2018.06.002 <https://doi.org/10.1016/j.ocemod.2018.06.002> , hdl:10013/epic.9f6e4954-81cc-46b9-9d96-78a944237976 |
op_doi |
https://doi.org/10.1016/j.ocemod.2018.06.002 |
container_title |
Ocean Modelling |
container_volume |
128 |
container_start_page |
48 |
op_container_end_page |
66 |
_version_ |
1810293249449918464 |