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  Analyzing links between simulated Laptev Sea sea ice and atmospheric conditions over adjoining landmasses using causal-effect networks

Rehder, Z., Niederdrenk, A. L., Kaleschke, L., & Kutzbach, L. (2020). Analyzing links between simulated Laptev Sea sea ice and atmospheric conditions over adjoining landmasses using causal-effect networks. The Cryosphere, 14, 4201-4215. doi:10.5194/tc-14-4201-2020.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-B227-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-6CA8-B
Genre: Journal Article

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 Creators:
Rehder, Zoé1, 2, Author           
Niederdrenk, Anne Laura3, Author           
Kaleschke, Lars, Author
Kutzbach, Lars, Author
Affiliations:
1Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913566              
2IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913547              
3Max Planck Research Group The Sea Ice in the Earth System, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913554              

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 Abstract: We investigate how sea ice interacts with the atmosphere over adjacent landmasses in the Laptev Sea region as a step towards a better understanding of the connection between sea ice and permafrost. We identify physical mechanisms as well as local and large-scale drivers of sea-ice cover with a focus on one region with highly variable sea-ice cover and high sea-ice productivity: the Laptev Sea region. We analyze the output of a coupled ocean–sea-ice–atmosphere–hydrological-discharge model with two statistical methods. With the recently developed causal-effect networks we identify temporal links between different variables, while we use composites of high- and low-sea-ice-cover years to reveal spatial patterns and mean changes in variables.

We find that in the model local sea-ice cover is a driven rather than a driving variable. Springtime melt of sea ice in the Laptev Sea is mainly controlled by atmospheric large-scale circulation, mediated through meridional wind speed and ice export. During refreeze in fall thermodynamic variables and feedback mechanisms are important – sea-ice cover is interconnected with air temperature, thermal radiation and specific humidity. Though low sea-ice cover leads to an enhanced southward transport of heat and moisture throughout summer, links from sea-ice cover to the atmosphere over land are weak, and both sea ice in the Laptev Sea and the atmospheric conditions over the adjacent landmasses are mainly controlled by common external drivers.

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Language(s): eng - English
 Dates: 2020-022020-102020-11-25
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.5194/tc-14-4201-2020
BibTex Citekey: RehderNiederdrenkEtAl2020
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Title: The Cryosphere
  Abbreviation : TC
Source Genre: Journal
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Publ. Info: Copernicus Publications
Pages: - Volume / Issue: 14 Sequence Number: - Start / End Page: 4201 - 4215 Identifier: ISSN: 1994-0416
Other: 1994-0424
CoNE: https://pure.mpg.de/cone/journals/resource/1994-0416