A 720-kyear record of dust variability from the Dome Fuji ice core, Antarctica
Abstract
Microparticles (dust) in deep ice cores in polar area are well-known as an indicator of terrestrial materials. Dust concentrations in deep ice cores vary with climate and environmental changes such as variations of dust origin areas, atmospheric transport intensity and atmospheric water cycle. Here we present a new dust record from deep ice core reached 3035.22 m depth in January 2007 at Dome Fuji, Antarctica (77°19'S, 39°42'E, 3,810m a.s.l.). The age of ice core in 3028-m depth was ca. 720 kyears ago, which corresponded to Marine Isotope Stage (MIS) 17. Dust concentrations in the ice core periodically varied high during glacial periods, especially the end stages of glacial periods, and low during interglacial periods with glacial-interglacial cycles from MIS 17 to Holocene. The amplitudes of dust variation on glacial-interglacial cycles were smaller than after ~ 430 kyears ago (MIS 12), so-called the Mid-Brunhes Event (MBE). Dust concentration variations and concentration levels of the Dome Fuji ice core were similar to those of EPICA Dome C. The ratios of dust larger than 1 micrometer in diameter were also high during the end stages of glacial periods and low during interglacial periods, suggesting that the intensity of atmospheric circulation, which transported dust to Antarctic inland plateau, was relatively greater in the ends of glacial periods.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2008
- Bibcode:
- 2008AGUFM.C41C0525M
- Keywords:
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- 0305 Aerosols and particles (0345;
- 4801;
- 4906);
- 0724 Ice cores (4932);
- 1616 Climate variability (1635;
- 3305;
- 3309;
- 4215;
- 4513);
- 9310 Antarctica (4207)