Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE
A new meltpond parameterization has been developed for the CICE sea ice model, taking advantage of the level ice tracer available in the model. The ponds evolve according to physically based process descriptions assuming a depth-area ratio for changes in pond volume. A novel aspect of the new scheme...
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ftdtic:ADA609978 2023-05-15T13:11:38+02:00 Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE Hunke, Elizabeth C Hebert, David A Lecomte, Olivier NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV 2012-12-06 text/html http://www.dtic.mil/docs/citations/ADA609978 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA609978 en eng http://www.dtic.mil/docs/citations/ADA609978 Approved for public release; distribution is unlimited. DTIC Snow Ice and Permafrost *SEA ICE ALBEDO ARCTIC REGIONS MELTING MODELS RIDGES MELT PONDS PE0602435N Text 2012 ftdtic 2016-02-24T16:21:48Z A new meltpond parameterization has been developed for the CICE sea ice model, taking advantage of the level ice tracer available in the model. The ponds evolve according to physically based process descriptions assuming a depth-area ratio for changes in pond volume. A novel aspect of the new scheme is that the ponds are carried as tracers on the level ice area of each thickness category, thus limiting their spatial extent based on the simulated sea ice topography. This limiting is meant to approximate the horizontal drainage of melt water into depressions in ice floes. Simulated melt pond processes include collection of liquid melt water and rain into ponds, drainage through permeable sea ice or over the edges of floes, infiltration of snow by pond water, and refreezing of ponds. Furthermore, snow that falls on top of ponds whose top surface has refrozen blocks radiation from penetrating into the ponds and sea ice below. Along with a control simulation, we present a range of sensitivity tests to parameters related to each subprocess described by the parameterization. With the exception of one parameter that alters the albedo of snow-covered pond ice, results are not highly sensitive to these parameters unless an entire process is removed. The snow simulation itself is critical, because the volume of snow deposition and rate of snow melt largely determine the timing and extent of the simulated melt ponds. Nevertheless, compensating effects moderate the model's sensitivity to precipitation changes. For instance, infiltration of the snow by melt water postpones the appearance of ponds and the subsequent acceleration of melting through albedo feedback, while snow on top of refrozen pond ice also reduces the ponds' effect on the radiation budget. By construction, the model simulation of level and ridged ice is also important for this parameterization. We find that as sea ice thins, either through time or when comparing sensitivity tests, the area of level ice increases. Pub in Ocean Modelling, v71 p26-42, 2013 Text albedo Arctic Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database Arctic |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Snow Ice and Permafrost *SEA ICE ALBEDO ARCTIC REGIONS MELTING MODELS RIDGES MELT PONDS PE0602435N |
spellingShingle |
Snow Ice and Permafrost *SEA ICE ALBEDO ARCTIC REGIONS MELTING MODELS RIDGES MELT PONDS PE0602435N Hunke, Elizabeth C Hebert, David A Lecomte, Olivier Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE |
topic_facet |
Snow Ice and Permafrost *SEA ICE ALBEDO ARCTIC REGIONS MELTING MODELS RIDGES MELT PONDS PE0602435N |
description |
A new meltpond parameterization has been developed for the CICE sea ice model, taking advantage of the level ice tracer available in the model. The ponds evolve according to physically based process descriptions assuming a depth-area ratio for changes in pond volume. A novel aspect of the new scheme is that the ponds are carried as tracers on the level ice area of each thickness category, thus limiting their spatial extent based on the simulated sea ice topography. This limiting is meant to approximate the horizontal drainage of melt water into depressions in ice floes. Simulated melt pond processes include collection of liquid melt water and rain into ponds, drainage through permeable sea ice or over the edges of floes, infiltration of snow by pond water, and refreezing of ponds. Furthermore, snow that falls on top of ponds whose top surface has refrozen blocks radiation from penetrating into the ponds and sea ice below. Along with a control simulation, we present a range of sensitivity tests to parameters related to each subprocess described by the parameterization. With the exception of one parameter that alters the albedo of snow-covered pond ice, results are not highly sensitive to these parameters unless an entire process is removed. The snow simulation itself is critical, because the volume of snow deposition and rate of snow melt largely determine the timing and extent of the simulated melt ponds. Nevertheless, compensating effects moderate the model's sensitivity to precipitation changes. For instance, infiltration of the snow by melt water postpones the appearance of ponds and the subsequent acceleration of melting through albedo feedback, while snow on top of refrozen pond ice also reduces the ponds' effect on the radiation budget. By construction, the model simulation of level and ridged ice is also important for this parameterization. We find that as sea ice thins, either through time or when comparing sensitivity tests, the area of level ice increases. Pub in Ocean Modelling, v71 p26-42, 2013 |
author2 |
NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV |
format |
Text |
author |
Hunke, Elizabeth C Hebert, David A Lecomte, Olivier |
author_facet |
Hunke, Elizabeth C Hebert, David A Lecomte, Olivier |
author_sort |
Hunke, Elizabeth C |
title |
Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE |
title_short |
Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE |
title_full |
Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE |
title_fullStr |
Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE |
title_full_unstemmed |
Level-Ice Melt Ponds in the Los Alamos Sea Ice Model, CICE |
title_sort |
level-ice melt ponds in the los alamos sea ice model, cice |
publishDate |
2012 |
url |
http://www.dtic.mil/docs/citations/ADA609978 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA609978 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Ice permafrost Sea ice |
genre_facet |
albedo Arctic Ice permafrost Sea ice |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA609978 |
op_rights |
Approved for public release; distribution is unlimited. |
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1766248268484837376 |