 |
| Titel |
Millennium-long summer temperature variations in the European Alps as reconstructed from tree rings |
| VerfasserIn |
C. Corona, J. Guiot, J. L. Edouard, F. Chalié, U. Büntgen, P. Nola, C. Urbinati |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 6, no. 3 ; Nr. 6, no. 3 (2010-06-25), S.379-400 |
| Datensatznummer |
250003549
|
| Publikation (Nr.) |
 copernicus.org/cp-6-379-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper presents a reconstruction of the summer temperatures over the
Greater Alpine Region (44.05°–47.41° N, 6.43°–13° E) during
the last millennium based on a network of 38 multi-centennial larch and
stone pine chronologies. Tree ring series are standardized using an
Adaptative Regional Growth Curve, which attempts to remove the age effect
from the low frequency variations in the series. The proxies are calibrated
using the June to August mean temperatures from the HISTALP high-elevation
temperature time series spanning the 1818–2003. The method combines an
analogue technique, which is able to extend the too short tree-ring series,
an artificial neural network technique for an optimal non-linear calibration
including a bootstrap technique for calculating error assessment on the
reconstruction. About 50% of the temperature variance is reconstructed.
Low-elevation instrumental data back to 1760 compared to their instrumental
target data reveal divergence between (warmer) early instrumental
measurements and (colder) proxy estimates. The proxy record indicates cool
conditions, from the mid-11th century to the mid-12th century, related to
the Oort solar minimum followed by a short Medieval Warm Period (1200–1420).
The Little Ice Age (1420–1830) appears particularly cold between 1420 and
1820 with summers that are 0.8 °C cooler than the 1901–2000 period. The
new record suggests that the persistency of the late 20th century warming
trend is unprecedented. It also reveals significant similarities with other
alpine reconstructions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|