Anthropogenic influence on recent circulation-driven Antarctic sea ice changes

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Author(s) Haumann, F. Alexander, Notz, Dirk, Schmidt, Hauke
Publication Type Journal Items, Publication Status: Published
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Title Anthropogenic influence on recent circulation-driven Antarctic sea ice changes
Author(s) Haumann, F. Alexander
Notz, Dirk
Schmidt, Hauke
Journal or Series Title Geophysical research letters
Volume Number 41
Issue Number 23
Start Page 8429
End Page 8437
ISSN 0094-8276
1944-8007
Publisher American Geophysical Union
Publication Place Washington, DC
Publication Date 2014-12-16
Abstract Observations reveal an increase of Antarctic sea ice over the past three decades, yet global climate models tend to simulate a sea ice decrease for that period. Here we combine observations with model experiments (MPI-ESM) to investigate causes for this discrepancy and for the observed sea ice increase. Based on observations and atmospheric reanalysis, we show that on multidecadal time scales Antarctic sea ice changes are linked to intensified meridional winds that are caused by a zonally asymmetric lowering of the high-latitude surface pressure. In our simulations, this surface pressure lowering is a response to a combination of anthropogenic stratospheric ozone depletion and greenhouse gas increase. Combining these two lines of argument, we infer a possible anthropogenic influence on the observed sea ice changes. However, similar to other models, MPI-ESM simulates a surface-pressure response that is rather zonally symmetric, which explains why the simulated sea ice response differs from observations.
DOI 10.1002/2014GL061659
Additional Notes Published online by: Wiley
Received 25 August 2014, Accepted 22 November 2014, Published online 15 December 2014
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000047284
Source Database ID FORM-1420544994
WOS-000348462000037
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@article{Hmnn2014,
  author = "Haumann, F. Alexander and Notz, Dirk and Schmidt, Hauke",
  title = "{A}nthropogenic influence on recent circulation-driven {A}ntarctic sea ice changes",
  journal = "Geophysical research letters",
  year = 2014,
  volume = "41",
  number = "23",
  pages = "8429--8437",
  month = dec,
}


E-Citations record created: Tue, 06 Jan 2015, 11:50:01 CET