EPICA-DOME C ICE CORE: EXTENDING THE DUST RECORD OVER THE LAST 7 CLIMATIC CYCLES (740 kyr B.P.)

• Main Authors: Petit, J-. R., Delmonte, B., Lambert, F., Ruth, Urs, Bigler, M., Maggi, V., Stefensen, J. P.
• Format: Conference Object
• Language: unknown
• Published: 2004
• Subjects: Antarctic; Coulter; Greenland; Antarc*; Antarctica; EPICA; ice core
• Online Access: https://epic.awi.de/id/eprint/10964/; https://hdl.handle.net/10013/epic.21429

Objectives:The European Project of Ice Coring in Antarctica (EPICA) gathers 10 nations and aims to reconstruct pastclimate and environment from deep ice cores in Antarctica to document the last part of the Quaternaryperiod. Two deep ice cores are planned in two different regions : one in the Dome C area (75°06' S, 123°21'E, 3233m a.s.l.) in central area, the second in Droning Maud area (75°00'S; 00°04'E, 2892 m.a.s.l)closer to Southern Atlantic ocean. The first drilling from Dome C reached 3200 m depth by January 2003and the dust record over 3130m is presented here.Material and Methods:Insoluble dust in Antarctic ice mainly originates from southern South America and results from eoliandeflation of the continent, transported by the atmospheric circulation.Dust measurements have been performed using two independent techniques. A laser system was deployedon the field for continuous measurements and set on the continuous flow line sampler along with thechemistry analysis. The signal was recorded continuously from 769 m depth down to 3137m and could belinked to the total dust concentration. On a other hand, from 1000 levels of discrete ice core samples, thedust concentrations and size distributions have been performed in laboratory using a Coulter Coulter#(mutisizerII).Results:During glacial periods, a large change of dust concentration is commonly observed on ice core fromAntarctica and Greenland and interpreted as the consequence of the glacial climate with a great extensionof the ice caps, periglacial area, a bigger continental aridity and reduced hydrological cycle and vegetationcover, change in the atmospheric circulation # At the first order, the dust concentration in Antarctic ice corescould be linked to the global ice volume.Over the last 4 climate cycles, the EPICA Dome C dust record mimics the Vostok dust record and the highdust inputs (up to a factor 50 with respect to present time) are linked to the glacial periods and to MarineIsotopic Stage (i.e. MIS 2, 4, 6, 10). For glacial and interglacial periods, ...