FN Archimer Export Format
PT J
TI Iberian Margin sea surface temperature during MIS 15 to 9 (580-300 ka): Glacial suborbital variability versus interglacial stability
BT 
AF RODRIGUES, T.
   VOELKER, A. H. L.
   GRIMALT, J. O.
   ABRANTES, F.
   NAUGHTON, F.
AS 1:1,2;2:1,2;3:3;4:1;5:1,2;
FF 1:;2:;3:;4:;5:;
C1 LNEG, Unidade Geol Marinha, P-2721866 Lisbon, Portugal.
   CIMAR Associated Lab, Oporto, Portugal.
   Inst Environm Assessment & Water Res, Dept Environm Chem, E-08034 Barcelona, Spain.
C2 LNEG, PORTUGAL
   UNIV PORTO, PORTUGAL
   IDAEA CSIC, SPAIN
IF 3.357
TC 95
UR https://archimer.ifremer.fr/doc/00228/33879/32246.pdf
   https://archimer.ifremer.fr/doc/00228/33879/32247.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   MD 123 / GEOSCIENCES 1
   MD 134 / PICABIA
BO Marion Dufresne
AB Past sea surface water conditions of the western Iberian Margin were reconstructed based on biomarker analyses of a marine deep sea core MD03-2699 from the Estremadura Spur north off Lisbon, providing new insights into orbital and suborbital-scale climate variability between marine isotope stage (MIS) 15 to MIS 9 (580 to 300 ka). We use biomarker-based proxy records such as the alkenone unsaturated index to estimate sea surface temperature (SST), the total alkenone concentration to reconstruct phytoplankton productivity, and terrestrial biomarkers to evaluate the continental input. The results extend the existing biomarker record, namely the SST for the Iberian Margin, back to the sixth climatic cycle (580 ka). A general trend of stable interglacials contrasts with glacial periods and glacial inceptions which are marked by high-frequency variability. Thus, several short-lived climatic coolings were identified by large SST decreases, the occurrence of ice-rafted detritus and high percentages of the tetraunsaturated alkenone C-37:4. Some of these events were extremely cold and similar in their general trends to the well-known Heinrich events of the last glaciation. We identified eight Heinrich-type events between 580 and 300 ka. The general deglaciation pattern detected between MIS 15 and MIS 9 is similar in their general trends to that characterizing the more recent climatic cycles, i.e., marked by two coolings separated by a short warming episode which may reflect the southward, northward, and southward migration of the Polar Front.
PY 2011
PD FEB
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 26
IS 1
UT 000287690900002
DI 10.1029/2010PA001927
ID 33879
ER

EF