FN Archimer Export Format
PT J
TI Reconstructing marine productivity of the Cariaco Basin during marine isotope stages 3 and 4 using organic-walled dinoflagellate cysts
BT 
AF GONZALEZ, Catalina
   DUPONT, Lydie M.
   MERTENS, Kenneth
   WEFER, Gerold
AS 1:1;2:1;3:2;4:1;
FF 1:;2:;3:;4:;
C1 Univ Bremen, MARUM, D-28369 Bremen, Germany.
   Univ Ghent, Res Unit Palaeontol, Dept Geol & Soil Sci, B-9000 Ghent, Belgium.
C2 UNIV BREMEN, GERMANY
   UNIV GHENT, BELGIUM
IF 3.626
TC 28
UR https://archimer.ifremer.fr/doc/00237/34805/33327.pdf
   https://archimer.ifremer.fr/doc/00237/34805/33328.pdf
LA English
DT Article
CR MD 132 / P.I.C.A.S.S.O.-IMAGES11
BO Marion Dufresne
AB An organic-walled dinoflagellate cyst analysis was carried out on sediment core MD03-2622, retrieved from the Cariaco Basin. The core comprises the 73-30 ka interval. Down core changes in cyst abundance, accumulation rate, and composition of cyst assemblages were used to identify climatic and oceanographic changes at orbital and millennial time scales in this near-equatorial seasonal upwelling area. Throughout the sequence, dinoflagellate cyst assemblages were dominated by heterotrophic dinocysts (mainly Brigantedinium spp.), with the exception of four autotrophic-dominated (mainly Spiniferites ramosus) intervals around 58, 53, 46, and 37 ka. At orbital time scales, changes in the dinoflagellate productivity seem to follow low-latitude insolation, with the highest productivities coinciding with maximum February insolation (47-38 ka). At millennial scales, cyst accumulation rates appeared to coincide with Dansgaard-Oeschger (D-O) variability, with significant increments occurring during warm interstadials. The opposite was true during stadials. Short periods of high nutrient availability and stratified conditions followed Heinrich events H4, H5, H5a, and H6 and concurred with enhanced river runoff. Spectral analyses confirm the existence of these and other higher-frequency periodicities and support the idea of a tightly coupled terrestrial/marine and tropical/high-latitude climate system during the last glacial period.
PY 2008
PD AUG
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 23
IS 3 / PA3215
UT 000258825100001
BP 1
EP 16
DI 10.1029/2008PA001602
ID 34805
ER

EF