FN Archimer Export Format
PT J
TI Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP
BT 
AF PECK, V. L.
   HALL, I. R.
   ZAHN, R.
   ELDERFIELD, H.
AS 1:1;2:1;3:3,4;4:2;
FF 1:;2:;3:;4:;
C1 Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3YE, S Glam, Wales.
   Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England.
   Univ Autonoma Barcelona, Dept Geol, Inst Ciencia & Tecnol Ambientals, E-08193 Barcelona, Spain.
   Univ Autonoma Barcelona, Dept Geol, Inst Catalana Recerca & Estudis Avancats, E-08193 Barcelona, Spain.
C2 UNIV CARDIFF, UK
   UNIV CAMBRIDGE, UK
   UNIV AUTONOMA BARCELONA, SPAIN
   UNIV AUTONOMA BARCELONA, SPAIN
IF 3.626
TC 55
UR https://archimer.ifremer.fr/doc/00237/34797/33340.pdf
LA English
DT Article
CR MD 123 / GEOSCIENCES 1
BO Marion Dufresne
AB We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55-8 ka BP from NE Atlantic sediment core MD01-2461. Millennial-scale temporal variability and longer-term trends in these records enable us to develop a detailed picture of past ocean conditions such as a weakening of thermocline intensity from marine isotope stage 3 (MIS 3) to the last glacial maximum (LGM). The correspondence of all temperature proxies and convergence of paired oxygen isotope (delta O-18) records from both planktonic species implies a breakdown in the thermocline and year-round mixing of the upper water column through the LGM, perhaps related to decreasing insolation and additional cooling in association with the expansion of the circum-North Atlantic ice sheets. Millennial-scale divergence in surface and subsurface temperatures and delta O-18 across the last glacial correspond to meltwater release and the development of a strong halocline associated with both Heinrich (H) events and instabilities of the NW European ice sheet. During such episodes, G. bulloides Mg/Ca appears to record ambient, even warming summer sea surface temperatures across H events while the other proxies record maximum cooling.
PY 2008
PD SEP
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 23
IS 3 / PA3221
UT 000259608900001
BP 1
EP 11
DI 10.1029/2008PA001631
ID 34797
ER

EF