SYNCHRONIZED TERRESTRIAL-ATMOSPHERIC DEGLACIAL RECORDS AROUND THE NORTH-ATLANTIC

Citation
S. Bjorck et al., SYNCHRONIZED TERRESTRIAL-ATMOSPHERIC DEGLACIAL RECORDS AROUND THE NORTH-ATLANTIC, Science, 274(5290), 1996, pp. 1155-1160
Citations number
91
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Multidisciplinary Sciences
Journal title
Science → ACNP
ISSN journal
0036-8075
Volume
274
Issue
5290
Year of publication
1996
Pages
1155 - 1160
Database
ISI
SICI code
0036-8075(1996)274:5290<1155:STDRAT>2.0.ZU;2-5
Abstract
On the basis of synchronization of three carbon-14 (C-14)-dated lacust rine sequences from Sweden With tree ring and ice core records, the ab solute age of the Younger Dryas-Preboreal climatic shift was determine d to be 11,450 to 11,390 +/- 80 years before the present. A 150-year-l ong cooling in the early Preboreal, associated with rising Delta(14)C values, is evident in all records and indicates an ocean ventilation c hange. This cooling is similar to earlier deglacial coolings, and box- model calculations suggest that they all may have been the result of i ncreased freshwater forcing that inhibited the strength of the North A tlantic heat conveyor, although the Younger Dryas may have begun as an anomalous meltwater event.