Modeled seasonality of glacial abrupt climate events

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Author(s) Flückiger, Jacqueline, Knutti, Reto, White, James W.C., Renssen, Hans
Publication Type Journal Items, Publication Status: Published
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Title Modeled seasonality of glacial abrupt climate events
Author(s) Flückiger, Jacqueline
Knutti, Reto
White, James W.C.
Renssen, Hans
Journal or Series Title Climate dynamics
Volume Number 31
Issue Number 6
Start Page 633
End Page 645
ISSN 0930-7575
1432-0894
Publisher Springer
Publication Place Berlin
Publication Date 2008-11
Keyword(s) Climate modeling
Dansgaard-Oeschger events
Glacial
Seasonality
Meridional overturning circulation
Abstract Greenland ice cores, as well as many other paleo-archives from the northern hemisphere, recorded a series of 25 warm interstadial events, the so-called Dansgaard-Oeschger (D-O) events, during the last glacial period. We use the three-dimensional coupled global ocean–atmosphere–sea ice model ECBILT-CLIO and force it with freshwater input into the North Atlantic to simulate abrupt glacial climate events, which we use as analogues for D-O events. We focus our analysis on the Northern Hemisphere. The simulated events show large differences in the regional and seasonal distribution of the temperature and precipitation changes. While the temperature changes in high northern latitudes and in the North Atlantic region are dominated by winter changes, the largest temperature increases in most other land regions are seen in spring. Smallest changes over land are found during the summer months. Our model simulations also demonstrate that the temperature and precipitation change patterns for different intensifications of the Atlantic meridional overturning circulation are not linear. The extent of the transitions varies, and local non-linearities influence the amplitude of the annual mean response as well as the response in different seasons. Implications for the interpretation of paleo-records are discussed.
DOI 10.1007/s00382-008-0373-y
Additional Notes Received 8 December 2006, Accepted 15 January 2008, Published online 9 February 2008
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03777
03731
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NEBIS System Number 000036174
Source Database ID PP-46506
PP-43919
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@article{Flckgr2008,
  author = "Fl{\"{u}}ckiger, Jacqueline and Knutti, Reto and White, James W.C. and Renssen, Hans",
  title = "{M}odeled seasonality of glacial abrupt climate events",
  journal = "Climate dynamics",
  year = 2008,
  volume = "31",
  number = "6",
  pages = "633--645",
  month = nov,
}


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