A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model
Today we experience an accelerated melting of sea ice in the Arctic which global circulation models are inadequate to predict. We believe one of the reasons is the shortcomings in the sea-ice albedo schemes for these models. This paper investigate a physically based sea-ice albedo scheme for ECHAM5...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.499.3559 2023-05-15T13:10:36+02:00 A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model Christina A. Pedersen Erich Roeckner Mikael Lüthje Jan-gunnar Winther C. A. Pedersen A The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.3559 http://munin.uit.no/bitstream/handle/10037/1909/paper_2.pdf;jsessionid=74DEF42A6436BB969B64B36E2E70D3DC?sequence=4 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.3559 http://munin.uit.no/bitstream/handle/10037/1909/paper_2.pdf;jsessionid=74DEF42A6436BB969B64B36E2E70D3DC?sequence=4 Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://munin.uit.no/bitstream/handle/10037/1909/paper_2.pdf;jsessionid=74DEF42A6436BB969B64B36E2E70D3DC?sequence=4 text ftciteseerx 2016-01-08T08:57:41Z Today we experience an accelerated melting of sea ice in the Arctic which global circulation models are inadequate to predict. We believe one of the reasons is the shortcomings in the sea-ice albedo schemes for these models. This paper investigate a physically based sea-ice albedo scheme for ECHAM5 GCM, which separates be-tween snow covered sea ice, bare sea ice, melt ponds and open water (albedos and fractions separately). The new albedo scheme includes important components like albedo decay due to snow aging, bare sea-ice albedo dependent on the ice thickness and a melt pond albedo dependent on the melt pond depth. The explicit treatment of melt pond albedos has to our knowledge never been seen in general circula-tion models before, and represents a substantial improvement when simulating the annual cycle of sea-ice albedo. The new albedo scheme overall reduce the sea-ice albedo both in winter due to snow ageing and in summer due to melt ponds. The reduced sea-ice albedo leads to overall reduced sea-ice thickness, concentration and volume, with large temporal and spatial variations. In March, some areas experience increased albedo, resulting in thicker sea ice and higher ice concentration, but in August the pattern is more spatially homogeneous with reduced albedo, thickness and concentrations for all areas where the new scheme has a significant effect. Key words: sea ice albedo, general circulation model, melt ponds ∗ Corresponding author. Text albedo Arctic Sea ice Unknown Arctic |
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description |
Today we experience an accelerated melting of sea ice in the Arctic which global circulation models are inadequate to predict. We believe one of the reasons is the shortcomings in the sea-ice albedo schemes for these models. This paper investigate a physically based sea-ice albedo scheme for ECHAM5 GCM, which separates be-tween snow covered sea ice, bare sea ice, melt ponds and open water (albedos and fractions separately). The new albedo scheme includes important components like albedo decay due to snow aging, bare sea-ice albedo dependent on the ice thickness and a melt pond albedo dependent on the melt pond depth. The explicit treatment of melt pond albedos has to our knowledge never been seen in general circula-tion models before, and represents a substantial improvement when simulating the annual cycle of sea-ice albedo. The new albedo scheme overall reduce the sea-ice albedo both in winter due to snow ageing and in summer due to melt ponds. The reduced sea-ice albedo leads to overall reduced sea-ice thickness, concentration and volume, with large temporal and spatial variations. In March, some areas experience increased albedo, resulting in thicker sea ice and higher ice concentration, but in August the pattern is more spatially homogeneous with reduced albedo, thickness and concentrations for all areas where the new scheme has a significant effect. Key words: sea ice albedo, general circulation model, melt ponds ∗ Corresponding author. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Christina A. Pedersen Erich Roeckner Mikael Lüthje Jan-gunnar Winther C. A. Pedersen A |
spellingShingle |
Christina A. Pedersen Erich Roeckner Mikael Lüthje Jan-gunnar Winther C. A. Pedersen A A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model |
author_facet |
Christina A. Pedersen Erich Roeckner Mikael Lüthje Jan-gunnar Winther C. A. Pedersen A |
author_sort |
Christina A. Pedersen |
title |
A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model |
title_short |
A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model |
title_full |
A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model |
title_fullStr |
A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model |
title_full_unstemmed |
A New Sea-Ice Albedo Parameterization for ECHAM5 General Circulation Model |
title_sort |
new sea-ice albedo parameterization for echam5 general circulation model |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.3559 http://munin.uit.no/bitstream/handle/10037/1909/paper_2.pdf;jsessionid=74DEF42A6436BB969B64B36E2E70D3DC?sequence=4 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Sea ice |
genre_facet |
albedo Arctic Sea ice |
op_source |
http://munin.uit.no/bitstream/handle/10037/1909/paper_2.pdf;jsessionid=74DEF42A6436BB969B64B36E2E70D3DC?sequence=4 |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.3559 http://munin.uit.no/bitstream/handle/10037/1909/paper_2.pdf;jsessionid=74DEF42A6436BB969B64B36E2E70D3DC?sequence=4 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766235667308740608 |