FN Archimer Export Format
PT J
TI Low-frequency Pliocene climate variability in the eastern Nordic Seas
BT 
AF RISEBROBAKKEN, Bjorg
   ANDERSSON, Carin
   DE SCHEPPER, Stijn
   MCCLYMONT, Erin L.
AS 1:1;2:1;3:1;4:2;
FF 1:;2:;3:;4:;
C1 Bjerknes Ctr Climate Res, Uni Res Climate, Bergen, Norway.
   Univ Durham, Dept Geog, Durham, England.
C2 BCCR, NORWAY
   UNIV DURHAM, UK
IF 3.254
TC 11
UR https://archimer.ifremer.fr/doc/00504/61599/65864.pdf
LA English
DT Article
CR IMAGES 1-MD101
BO Marion Dufresne
DE ;Pliocene;Nordic Seas;stable isotopes;diagenetic calcite;paleogeography;external and internal forcing
AB The Pliocene (5.3-2.6Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from Ocean Drilling Program Hole 642B in the eastern Nordic Seas document that the Pliocene was not a stable period characterized by one climate. Rather, seven distinct climate phases, each lasting between 150,000 and 400,000years, are identified and characterized in the time interval 5.1-3.1Ma. Four of the transitions between the defined climate phases occurred close to an eccentricity minimum and a minimum in amplitude of change for Northern Hemisphere summer insolation, while two occurred around an eccentricity maximum and a maximum in amplitude in insolation change. Hence, a low-frequency response of the Nordic Seas to insolation forcing is indicated. In addition, paleogeographic and related paleoceanographic changes, expansion of the Arctic sea ice cover, and onset of Northern Hemisphere glaciation were important factors behind the evolving Pliocene low-frequency variability in the eastern Nordic Seas. It is likely that the identified climate phases and transitions are important beyond the Nordic Seas, due to their association with changes to both insolation and paleogeography. However, a strong and variable degree of diagenetic calcite overgrowth is documented for the planktic foraminifera, especially influencing the planktic O-18 results; the absolute values and amplitude of change cannot be taken at face value. 
PY 2016
PD SEP
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 31
IS 9
UT 000385742500001
BP 1154
EP 1175
DI 10.1002/2015PA002918
ID 61599
ER

EF