Holocene Climate Variability As Reflected By Lake-level Fluctuations In The Jura Mountains, The Northern French Pre-alps and The Swiss Plateau
Abstract
A data set of 180 radiocarbon, tree-ring and archaeological dates obtained from sedi- ment sequences of 26 lakes in the Jura mountains, the northern French Pre-Alps and the Swiss Plateau was used to construct a Holocene mid-European lake-level record. The dates do not indicate a random distribution over the Holocene, but form clusters suggesting an alternation of lower and higher lake-level phases climatically driven. They provide evidence of a rather unstable Holocene climate punctuated by 15 phases of higher lake-level: 11 250-11 050, 10 300-10 000, 9550-9150, 8300-8050, 7550- 7250, 6350-5900, 5650-5200, 4850-4800, 4150-3950, 3500-3100, 2750-2350, 1800- 1700, 1300-1100, 750-650 cal BP and after 1394 AD. A comparison of this mid- European lake-level record with the GISP2-Polar Circulation Index record, the North Atlantic ice-rafting debris events and the 14C record suggests (i) teleconnections in a complex cryosphere-ocean-atmosphere system and (ii) that changes in the solar ac- tivity played a major role in Holocene climate oscillations over the North Atlantic area.
- Publication:
-
EGS General Assembly Conference Abstracts
- Pub Date:
- 2002
- Bibcode:
- 2002EGSGA..27.4048M