FN Archimer Export Format
PT J
TI Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka BP
BT 
AF DICKSON, Alexander J.
   AUSTIN, William E. N.
   HALL, Ian R.
   MASLIN, Mark A.
   KUCERA, Michal
AS 1:1;2:2;3:3;4:1;5:4;
FF 1:;2:;3:;4:;5:;
C1 UCL, Dept Geog, Environm Change Res Ctr, London WC1E 6BT, England.
   Univ St Andrews, Sch Geog & Geosci, St Andrews KY16 9AL, Fife, Scotland.
   Cardiff Univ, Sch Earth Ocean & Planetary Sci, Cardiff CF10 3YE, S Glam, Wales.
   Univ Tubingen, Inst Geowissensch, D-72076 Tubingen, Germany.
C2 UNIV COLL LONDON, UK
   UNIV ST ANDREWS, UK
   UNIV CARDIFF, UK
   UNIV TUBINGEN, GERMANY
IF 3.626
TC 27
UR https://archimer.ifremer.fr/doc/00237/34824/33304.pdf
LA English
DT Article
CR IMAGES 1-MD101
   MD 123 / GEOSCIENCES 1
BO Marion Dufresne
AB 1] There is much uncertainty surrounding the mechanisms that forced the abrupt climate fluctuations found in many palaeoclimate records during Marine Isotope Stage (MIS)-3. One of the processes thought to be involved in these events is the Atlantic Meridional Overturning Circulation ( MOC), which exhibited large changes in its dominant mode throughout the last glacial period. Giant piston core MD95- 2006 from the northeast Atlantic Ocean records a suite of palaeoceanographic proxies related to the activity of both surface and deep water masses through a period of MIS- 3 when abrupt climate fluctuations were extremely pronounced. A two- stage progression of surface water warming during interstadial warm events is proposed, with initial warming related to the northward advection of a thin warm surface layer within the North Atlantic Current, which only extended into deeper surface layers as the interstadial progressed. Benthic foraminifera isotope data also show millennialscale oscillations but of a different structure to the abrupt surface water changes. These changes are argued to partly be related to the influence of low- salinity deepwater brines. The influence of deepwater brines over the site of MD95- 2006 reached a maximum at times of rapid warming of surface waters. This observation supports the suggestion that brine formation may have helped to destabilize the accumulation of warm, saline surface waters at low latitudes, helping to force the MOC into a warm mode of operation. The contribution of deepwater brines relative to other mechanisms proposed to alter the state of the MOC needs to be examined further in future studies.
PY 2008
PD JUN
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 23
IS 3 / PA3206
UT 000257801800001
BP 1
EP 13
DI 10.1029/2008PA001595
ID 34824
ER

EF