FN Archimer Export Format
PT J
TI Evolution of the northeast Labrador Sea during the last interglaciation
BT 
AF WINSOR, Kelsey
   CARLSON, Anders E.
   KLINKHAMMER, Gary P.
   STONER, Joseph S.
   HATFIELD, Robert G.
AS 1:1;2:1,2;3:3;4:3;5:3;
FF 1:;2:;3:;4:;5:;
C1 Univ Wisconsin Madison, Dept Geosci, Madison, WI 53706 USA.
   Univ Wisconsin Madison, Ctr Climat Res, Madison, WI 53706 USA.
   Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA.
C2 UNIV WISCONSIN, USA
   UNIV WISCONSIN, USA
   UNIV OREGON STATE, USA
IF 2.94
TC 30
UR https://archimer.ifremer.fr/doc/00265/37604/36840.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   MD 132 / P.I.C.A.S.S.O.-IMAGES11
BO Marion Dufresne
DE ;Neogloboquadrina pachyderma (sinistral);Labrador Sea;Mg/Ca;deglaciations;interglaciations;subpolar gyre
AB Boreal summer insolation during the last interglaciation (LIG) generally warmed the subpolar to polar Northern Hemisphere more than during the early Holocene, yet regional climate variations between the two periods remain. We investigate northeast Labrador Sea subsurface temperature and hydrography across terminations (T) I and II and during the LIG to assess the impact of two different magnitudes of boreal summer insolation increase on the northeast Labrador Sea. We use Mg/Ca ratios in Neogloboquadrina pachyderma (sinistral) as a proxy of calcification temperature to document changes in subsurface temperatures over Eirik Drift. Our corresponding record of delta O-18 of seawater documents changes in water mass salinity. Mg/Ca calcification temperatures peak early in the Holocene coincident with peak boreal summer insolation. In contrast, LIG temperatures are relatively constant through the interglaciation, and are no warmer than peak Holocene temperatures. During the first half of the LIG, delta O-18 of seawater remains depleted, likely from southern Greenland Ice Sheet retreat and enhanced Arctic freshwater and sea-ice export to the Labrador Sea. The consequent stratification of the Labrador Sea and attendant suppressed convection explains delayed deep-ocean ventilation and a cooler subsurface in the northeast Labrador Sea during the LIG.
PY 2012
PD NOV
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU Amer Geophysical Union
VL 13
IS 11
UT 000310962100003
DI 10.1029/2012GC004263
ID 37604
ER

EF