 |
| Titel |
Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
| VerfasserIn |
W. J. Berg, M. R. Broeke, E. Meijgaard, F. Kaspar |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 4 ; Nr. 9, no. 4 (2013-07-22), S.1589-1600 |
| Datensatznummer |
250018094
|
| Publikation (Nr.) |
 copernicus.org/cp-9-1589-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The previous interglacial (Eemian, 130–114 kyr BP) had a mean sea level
highstand 4 to 7 m above the current level, and, according to climate
proxies, a 2 to 6 K warmer Arctic summer climate. Greenland ice cores
extending back into the Eemian show a reduced depletion in δ18O of
about 3‰ for this period, which suggests a significant warming of
several degrees over the Greenland ice sheet. Since the depletion in
δ18O depends, among other factors, on the condensation temperature
of the precipitation, we analyze climatological processes other than mean
temperature changes that influence condensation temperature, using output of
the regional climate model RACMO2. This model is driven by ERA-40 reanalysis
and ECHO-G GCM boundaries for present-day, preindustrial and Eemian climate.
The processes that affect the condensation temperature of the precipitation
are analyzed using 6-hourly model output. Our results show that changes in
precipitation seasonality can cause significant changes of up to 2 K in the
condensation temperature that are unrelated to changes in mean temperature. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|