 |
| Titel |
On the origin of multidecadal to centennial Greenland temperature anomalies over the past 800 yr |
| VerfasserIn |
T. Kobashi, D. T. Shindell  , K. Kodera, J. E. Box, T. Nakaegawa, K. Kawamura |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-08), S.583-596 |
| Datensatznummer |
250018007
|
| Publikation (Nr.) |
 copernicus.org/cp-9-583-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The surface temperature of the Greenland ice sheet is
among the most important climate variables for assessing how climate change
may impact human societies due to its association with sea level rise.
However, the causes of multidecadal-to-centennial temperature changes in
Greenland temperatures are not well understood, largely owing to short
observational records. To examine these, we calculated the Greenland
temperature anomalies (GTA[G-NH]) over the past 800 yr by
subtracting the standardized northern hemispheric (NH) temperature from the standardized Greenland
temperature. This decomposes the Greenland temperature variation into
background climate (NH); polar amplification; and regional variability
(GTA[G-NH]). The central Greenland polar amplification factor as
expressed by the variance ratio Greenland/NH is 2.6 over the past 161 yr,
and 3.3–4.2 over the past 800 yr. The GTA[G-NH] explains
31–35% of the variation of Greenland temperature in the
multidecadal-to-centennial time scale over the past 800 yr. We found
that the GTA[G-NH] has been influenced by solar-induced changes in
atmospheric circulation patterns such as those produced by the North
Atlantic Oscillation/Arctic Oscillation (NAO/AO). Climate modeling and
proxy temperature records indicate that the anomaly is also likely linked to
solar-paced changes in the Atlantic meridional overturning circulation
(AMOC) and associated changes in northward oceanic heat transport. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|