Southern Ocean Heinrich Event Alkenone Productivity DataEntry ID: NOAA_NCDC_PALEO_2006-054
Abstract: Massive iceberg discharges from the Northern Hemisphere ice sheets, 'Heinrich events', coincided with the coldest periods of the last ice age. There is widespread evidence for Heinrich events and their profound impact on the climate and circulation of the North Atlantic Ocean, but their influence beyond that region remains uncertain. Here we use a combination of molecular fingerprints of algal ... productivity and radioisotope tracers of sedimentation to document eight periods of increased productivity in the subpolar Southern Ocean during the past 70,000 years that occurred within 1,000-2,000 years of a Northern Hemisphere Heinrich event. We discuss possible causes for such a link, including increased supply of iron from upwelling and increased stratification during the growing season, which imply an alteration of the global ocean circulation during Heinrich events. The mechanisms linking North Atlantic iceberg discharges with subantarctic productivity remain unclear at this point. We suggest that understanding how the Southern Ocean was altered during these extreme climate perturbations is critical to understanding the role of the ocean in climate change.
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Data Set Citation
Dataset Originator/Creator: Sachs, J.P. and R.F. Anderson
Dataset Title: Southern Ocean Heinrich Event Alkenone Productivity Data
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-054
Dataset Release Date: May 2006
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2006-054
Other Citation Details: NOAA/NCDC Paleoclimatology ProgramOnline Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/sac...
Paleo Temporal Coverage
Paleo Start Date: 70 ka
Paleo Stop Date: 10 ka
ISO Topic Category
Use Constraints FUNDING SOURCE: National Science Foundation (USA).
Data Set Progress
Distribution Media: ftp
Distribution Format: text,excel
Email: jsachs at u.washington.edu
University of Washington Ocean Sciences Building, Room 521 Box 355351
Province or State: WA
Postal Code: 98195-5351
University of Southern California
City: Los Angeles
Province or State: CA
Postal Code: 90089
Sachs, J.P. and R.F. Anderson. 2005. Increased productivity in the subantarctic ocean during Heinrich events. Nature, Vol. 434, pp. 1118 - 1121, 28 April 2005.
Creation and Review Dates
DIF Creation Date: 2007-06-26
Last DIF Revision Date: 2008-02-22