Dust and calcium record in calculated for ice core EPICA Dome C, supplement to: Lambert, Fabrice; Bigler, Matthias; Steffensen, Jørgen Peder; Hutterli, Manuel A; Fischer, Hubertus (2012): Centennial mineral dust variability in high-resolution ice core data from Dome C, Antarctica. Climate of the Past, 8, 609-623

DOI

Ice core data from Antarctica provide detailed insights into the characteristics of past climate, atmospheric circulation, as well as changes in the aerosol load of the atmosphere. We present high-resolution records of soluble calcium (Ca2+), non-sea-salt soluble calcium (nssCa2+), and particulate mineral dust aerosol from the East Antarctic Plateau at a depth resolution of 1 cm, spanning the past 800 000 years. Despite the fact that all three parameters are largely dust-derived, the ratio of nssCa2+ to particulate dust is dependent on the particulate dust concentration itself. We used principal component analysis to extract the joint climatic signal and produce a common high-resolution record of dust flux. This new record is used to identify Antarctic warming events during the past eight glacial periods. The phasing of dust flux and CO2 changes during glacial-interglacial transitions reveals that iron fertilization of the Southern Ocean during the past nine glacial terminations was not the dominant factor in the deglacial rise of CO2 concentrations. Rapid changes in dust flux during glacial terminations and Antarctic warming events point to a rapid response of the southern westerly wind belt in the region of southern South American dust sources on changing climate conditions. The clear lead of these dust changes on temperature rise suggests that an atmospheric reorganization occurred in the Southern Hemisphere before the Southern Ocean warmed significantly.

Identifier
DOI https://doi.org/10.1594/PANGAEA.779311
Related Identifier https://doi.org/10.5194/cp-8-609-2012
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.779311
Provenance
Creator Lambert, Fabrice; Bigler, Matthias; Steffensen, Jørgen Peder; Hutterli, Manuel A; Fischer, Hubertus
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2012
Funding Reference Fifth Framework Programme; Fourth Framework Programme
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (123.350 LON, -75.100 LAT); Dome C, Antarctica
Temporal Coverage Begin 1993-01-01T00:00:00Z
Temporal Coverage End 2004-12-31T00:00:00Z