Tracing Glacial-interglacial Changes in the Dust Source to Antarctica using Helium Isotopes
Entry ID: winckler_0636898

[ Update this Record ]

Summary
Abstract: This award supports a project to study dust sources in Antarctic ice cores. Atmospheric aerosols play an important role both in global biogeochemical cycles as well as in the climate system of the Earth.

Purpose: Records extracted from Antarctic ice cores inform us that dust deposition from the atmosphere to the ice sheet was 15-20 times greater during glacial periods than during interglacials, which raises the possibility that dust may be a key player in climate change on glacial-interglacial timescales. By characterizing potential source areas from South America, South Africa, and Australia as well as fresh glacial flour from Patagonia, the project will determine if the interglacial dust was mobilized from a distinct geographical region (e.g., Australia) or from a more heavily weathered source region in South America. The intellectual merit of the project is that it will contribute to reconstructing climate-related changes in the rate of dust deposition, and in the provenance of the dust, it will provide critical constraints on hydrology and vegetation in the source regions, as well as on the nature of the atmospheric circulation transporting dust to the archive location.

Related URL
Link: VIEW RELATED INFORMATION
Description: Investigator's web page


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
CRYOSPHERE >SNOW/ICE    [Definition]
PALEOCLIMATE >ICE CORE RECORDS >ISOTOPES    [Definition]
PALEOCLIMATE >ICE CORE RECORDS    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
LABORATORY    [Information]
FIELD INVESTIGATION    [Information]


Instrument
MASS SPECTROMETERS    [Information]


Keywords
Helium Isotopes
Dust
biogeochemical cycles
climate
deposition
climate change


Data Set Progress
IN WORK


Originating Center
Lamont-Doherty Earth Observatory


Data Center
National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


NSIDC Antarctic Glaciological Data Center    [Information]
Data Center URL: http://nsidc.org/agdc/

Data Center Personnel
Name: NSIDC AGDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Personnel
GISELA WINCKLER
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: 845-365-8756
Email: winckler at ldeo.columbia.edu
Contact Address:
Lamont-Doherty Earth Observatory
City: Palisades
Province or State: NY
Postal Code: 10964
Country: USA


Publications/References
Maher, B., A. Borunda & G. Winckler. "Dust and Climate: Joint NOAA/INQUA workshop," Quaternary Perspectives, v.18, 2010, p. 4.

Creation and Review Dates
DIF Creation Date: 2011-11-30
Last DIF Revision Date: 2011-12-01

[ Update this Record ]


Link to Web Site