Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model
Sea ice is an important component of the global climate system. The presence of a snowpack covering sea ice can strongly modify the thermodynamic behaviour of the sea ice, due to the low thermal conductivity and high albedo of snow. The snowpack can be strongly stratified and change properties (dens...
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ftcopernicus:oai:publications.copernicus.org:gmdd75696 2023-05-15T13:35:06+02:00 Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model Wever, Nander Rossmann, Leonard Maaß, Nina Leonard, Katherine C. Kaleschke, Lars Nicolaus, Marcel Lehning, Michael 2019-05-14 application/pdf https://doi.org/10.5194/gmd-2019-97 https://www.geosci-model-dev-discuss.net/gmd-2019-97/ eng eng doi:10.5194/gmd-2019-97 https://www.geosci-model-dev-discuss.net/gmd-2019-97/ eISSN: 1991-9603 Text 2019 ftcopernicus https://doi.org/10.5194/gmd-2019-97 2019-12-24T09:49:12Z Sea ice is an important component of the global climate system. The presence of a snowpack covering sea ice can strongly modify the thermodynamic behaviour of the sea ice, due to the low thermal conductivity and high albedo of snow. The snowpack can be strongly stratified and change properties (density, water content, grain size and shape) throughout the seasons. Fresh water percolation during snow melt can decrease the salinity of the underlying ice, while flooding of the snow layer by saline ocean water can strongly impact both the ice mass balance and the freezing point of the snow. To capture the complex dynamics from the snowpack, we introduce modifications to the physics-based, multi-layer SNOWPACK model to simulate the snow-sea ice system. This involves modifications to the model thermodynamics and to describe water and salt transport through the snow – sea ice system by coupling the transport equation to the Richards equation. These modifications allow the snow microstructure descriptions developed in the SNOWPACK model to be applied to sea ice conditions as well. Here, we drive the model with data from Snow and Ice Mass-balance Buoys installed in the Weddell Sea in Antarctica. The model is able to simulate the temporal evolution of snow density, grain size and shape and snow wetness. The model simulations show abundant depth hoar layers and melt layers, as well as superimposed ice formation due to flooding and percolation. Gravity drainage of dense brine is underestimated as convective processes are so far neglected. Furthermore, with increasing model complexity, detailed forcing data for the simulations is required, which is difficult to acquire due to limited observations in polar regions. Text Antarc* Antarctica Sea ice Weddell Sea Copernicus Publications: E-Journals Weddell Weddell Sea |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Sea ice is an important component of the global climate system. The presence of a snowpack covering sea ice can strongly modify the thermodynamic behaviour of the sea ice, due to the low thermal conductivity and high albedo of snow. The snowpack can be strongly stratified and change properties (density, water content, grain size and shape) throughout the seasons. Fresh water percolation during snow melt can decrease the salinity of the underlying ice, while flooding of the snow layer by saline ocean water can strongly impact both the ice mass balance and the freezing point of the snow. To capture the complex dynamics from the snowpack, we introduce modifications to the physics-based, multi-layer SNOWPACK model to simulate the snow-sea ice system. This involves modifications to the model thermodynamics and to describe water and salt transport through the snow – sea ice system by coupling the transport equation to the Richards equation. These modifications allow the snow microstructure descriptions developed in the SNOWPACK model to be applied to sea ice conditions as well. Here, we drive the model with data from Snow and Ice Mass-balance Buoys installed in the Weddell Sea in Antarctica. The model is able to simulate the temporal evolution of snow density, grain size and shape and snow wetness. The model simulations show abundant depth hoar layers and melt layers, as well as superimposed ice formation due to flooding and percolation. Gravity drainage of dense brine is underestimated as convective processes are so far neglected. Furthermore, with increasing model complexity, detailed forcing data for the simulations is required, which is difficult to acquire due to limited observations in polar regions. |
format |
Text |
author |
Wever, Nander Rossmann, Leonard Maaß, Nina Leonard, Katherine C. Kaleschke, Lars Nicolaus, Marcel Lehning, Michael |
spellingShingle |
Wever, Nander Rossmann, Leonard Maaß, Nina Leonard, Katherine C. Kaleschke, Lars Nicolaus, Marcel Lehning, Michael Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model |
author_facet |
Wever, Nander Rossmann, Leonard Maaß, Nina Leonard, Katherine C. Kaleschke, Lars Nicolaus, Marcel Lehning, Michael |
author_sort |
Wever, Nander |
title |
Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model |
title_short |
Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model |
title_full |
Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model |
title_fullStr |
Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model |
title_full_unstemmed |
Version 1 of a sea ice module for the physics based, detailed, multi-layer SNOWPACK model |
title_sort |
version 1 of a sea ice module for the physics based, detailed, multi-layer snowpack model |
publishDate |
2019 |
url |
https://doi.org/10.5194/gmd-2019-97 https://www.geosci-model-dev-discuss.net/gmd-2019-97/ |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Antarc* Antarctica Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctica Sea ice Weddell Sea |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-2019-97 https://www.geosci-model-dev-discuss.net/gmd-2019-97/ |
op_doi |
https://doi.org/10.5194/gmd-2019-97 |
_version_ |
1766060890964099072 |