MD 130 / CADO
Type | Oceanographic cruise |
---|---|
Ship | Marion Dufresne |
Ship owner | TAAF |
Dates | 23/01/2003 - 17/02/2003 |
Chief scientist(s) | MICHEL Elisabeth , CROSTA Xavier |
LABORATOIRE DES SCIENCES DU CLIMAT ET DE L'ENVIRONNEMENT - UMR 8212 Orme des Merisiers Bâtiment 714 Chemin de Saint Aubin - RD 128 91191 Gif sur Yvette Cedex +33(0)1 69 08 77 11 |
|
DOI | 10.17600/3200040 |
Objective | This multidisciplinary cruise brought together paleoclimatic and water column-sediment process studies. The Southern ocean's role appears to be increasingly significant in climate changes in glacial-interglacial cycles as well as in the climate variations observed for the Holocene period, including the last 2,000 years. We need to know more about this natural variability in order to be able to distinguish what part of the changes currently observed is due to human influence and to predict future climate trends. The Southern ocean plays a major part in surface and deep ocean circulation, interacting with the expanse of its ice field, as well as in the carbon and silica cycles. Therefore, this cruise aimed to document the variations in surface temperatures, in the coverage of ice field, in the carbon cycle, in the silica cycle and in Deep Antarctic water fluxes during the Upper Holocene (with a time resolution ranging from year to decade) and during the last glacial-interglacial cycle, thanks to the capacity of the CALYPSO corer on board R/V Marion Dufresne. The present process studies undertaken during this mission (particulate fluxes in the water column and at the water-sediment interface, phytoplankton assemblages, geochemical measurements and CTD) will mainly be used to calibrate tools, alkenone temperatures, diatoms and Mg/Ca of foraminifera, biogenic silica contents, 15Ndiat, 13Cdiat, 30Sidiat, 18Odiat , and 230Th/231Pa, used for paleo-oceanographic purposes. The related national programs are: PROOF and PNEDC, and the international programs (including European ones) are IGBP/IMAGES, PACLIVA and CESOP. |