Une reconstitution des climats du dernier cycle climatique à partir des diagrammes polliniques. Comparaison avec les données océaniques et glaciaires
The multivariate treatment of long pollen sequences coming from peat bogs constitutes an easy and effective method of factorial regression for the semi-quantitative reconstruction of the Paleoclimates. The comparison of the results obtained for the upper Pleistocene with the isotopic profiles of sea...
| Main Author: | |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | Italian |
| Published: |
2003
|
| Subjects: | |
| Online Access: | http://eprints.bice.rm.cnr.it/855/ http://eprints.bice.rm.cnr.it/855/1/BOSSELIN111-136.pdf http://www.archcalc.cnr.it/indice/PDF14/BOSSELIN111-136.pdf |
| Summary: | The multivariate treatment of long pollen sequences coming from peat bogs constitutes an easy and effective method of factorial regression for the semi-quantitative reconstruction of the Paleoclimates. The comparison of the results obtained for the upper Pleistocene with the isotopic profiles of sea- and ice-cores, then with the previous methods, confirms a structuralization of the last climatic cycle in four periods: the interglacial Riss/Wurm including the optimum Eemian, the lower pleniglacial, the Wurmian interpleniglacial and the upper pleniglacial, before the Holocene. A numbering system of these oscillations, correlated with the Dansgaard-Oeschger events recognized in the ice-cores of Greenland, is proposed. A final statistical treatment shows a cyclic evolution of the forest vegetation during the Eemian, an evolution which better translates the variations of the Paleoclimates (temperature and humidity) than the arboreal pollen rate (AP). |
|---|