 |
| Titel |
The importance of equilibration in glacial climate simulations |
| VerfasserIn |
Jenny Brandefelt, Erik Kjellström, Jens-Ove Näslund, Gustav Strandberg, Antje Voelker, Barbara Wohlfarth |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042921
|
|
|
|
|
|
| Zusammenfassung |
| Last Glacial Maximum (21 000 yrs BP; LGM) and Greenland Stadial 12 (44 000 yrs BP;
GS12) climate has been simulated with the National Centre for Atmospheric Research
(NCAR) Community Climate System Model version 3 (CCSM3). Although the simulations
were initiated from simulated glacial climates, both simulations required 1500 years of
additional integration to reach equilibrium under the imposed boundary conditions and
forcings.
The annual global mean surface temperature changes by only 0.1oC during the
last 1000 years of the 1500 year long GS12 simulation. Despite this small global
change the slow equilibration is important for the simulated regional climate. The
corresponding change in the annual mean surface air temperature in the North Atlantic
region is more than 3oC with a maximum of 8oC in south-eastern Greenland. This
regional change is coupled to a decrease of the sea ice extent in the North Atlantic
region.
Both climates are compared to available proxy data of sea surface temperature (SST). The
simulated SST changes by up to 2oC in the North Atlantic region during the last
1000 years of the GS12 integration which leads to a better agreement with proxy
data. Simulated LGM SSTs are colder than the proxy data but show similar spatial
patterns. Simulated GS12 SSTs are in better agreement with the available proxy data. |
|
|
|
|
|
|