FN Archimer Export Format
PT J
TI Centennial-scale Holocene North Atlantic surface temperatures from Mg/Ca ratios in Globigerina bulloides
BT 
AF FARMER, Elizabeth J.
   CHAPMAN, Mark R.
   ANDREWS, Julian E.
AS 1:1;2:1;3:1;
FF 1:;2:;3:;
C1 Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England.
C2 UNIV E ANGLIA, UK
IF 2.979
TC 39
UR https://archimer.ifremer.fr/doc/00236/34760/33396.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
BO Marion Dufresne
DE ;planktonic foraminifera;Mg/Ca;G. bulloides;North Atlantic;Holocene
AB A high-resolution record of Mg/Ca ratios from the planktonic foraminifer Globigerina bulloides has been produced for IMAGES core MD99-2251 from the subpolar North Atlantic. The record extends from the Younger Dryas-Preboreal transition through the Holocene at similar to 70 year resolution, with a more detailed section at similar to 20 year resolution through the interval encompassing the major cooling episode 8200 years ago. Mg/Ca derived temperatures show significant variations through the Holocene, with surface temperatures ranging from similar to 8 to 13 degrees C. The onset of the Holocene is marked by an abrupt warming, with a further increase in early Holocene temperatures occurring prior to 9.5 ka. This is followed by a mid-Holocene period of cooler and more stable conditions before temperatures show a stepped increase at similar to 3.5 ka. The late Holocene period has the highest temperatures of the entire interglacial but also exhibits coolings of 2-3 degrees C approximately every 500 years. Variations of this magnitude typify the high-frequency component of temperature variability and do not seem to be restricted to the 8.2 ka event or the early Holocene, when stronger freshwater forcing associated with the decay of the ice sheets might be anticipated. However, episodes of enhanced drift ice input to North Atlantic are coincident with many of the Mg/Ca temperature minima over the last 6 ka. The long-term warming trend and stepped increase in temperature at similar to 3.5 ka are consistent with other planktonic foraminiferal records and appear to reflect regional-scale changes in the atmospheric forcing of the North Atlantic Current during periods of rapid climate change. Alternatively, changes in ecology may contribute to the Holocene Mg/Ca record, either by species changing their depth habitat or by a shift in seasonal production patterns.
PY 2008
PD DEC
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU Amer Geophysical Union
VL 9
IS 12 / Q1202
UT 000262167200001
BP 1
EP 15
DI 10.1029/2008GC002199
ID 34760
ER

EF