[Parameters: Topic='PALEOCLIMATE', Term='OCEAN/LAKE RECORDS', Variable_Level_1='RADIOCARBON']
Tropical Atlantic Alkenone SST ReconstructionEntry ID: NOAA_NCDC_PALEO_2006-041
Abstract: Evidence for abrupt climate changes on millennial and shorter timescales is
widespread in marine and terrestrial climate records. Rapid reorganization of
ocean circulation is considered to exert some control over these changes, as
are shifts in the concentrations of atmospheric greenhouse gases. The response
of the climate system to these two influences is fundamentally different:
slowing of ... thermohaline overturn in the North Atlantic Ocean is expected to
decrease northward heat transport by the ocean and to induce warming of the
tropical Atlantic, whereas atmospheric greenhouse forcing should cause roughly
synchronous global temperature changes. So these two mechanisms of climate
change should be distinguishable by the timing of surfacewater temperature
variations relative to changes in deep-water circulation. Here we present a
high-temporal-resolution record of sea surface temperatures from the western
tropical North Atlantic Ocean which spans the past 29,000 years, derived from
measurements of temperature-sensitive alkenone unsaturation in sedimentary
organic matter. We find significant warming is documented for Heinrich event
H1 (16,900 - 15,400 calendar years BP) and the Younger Dryas event (12,900 -
11,600 cal. yr BP), which were periods of intense cooling in the northern
North Atlantic. Temperature changes in the tropical and high-latitude North
Atlantic are out of phase, suggesting that the thermohaline circulation was the
important trigger for these rapid climate changes.
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Ruehlemann, C., S. Mulitza, P. J. Mueller, G. Wefer, and R. Zahn
Dataset Title: Tropical Atlantic Alkenone SST Reconstruction
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-041
Dataset Release Date: 4/2006
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2006-041
Other Citation Details: NOAA/NCDC Paleoclimatology ProgramOnline Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/rue...
Paleo Temporal Coverage
Paleo Start Date: 29 ka
Paleo Stop Date: 0 ka
PALEOCLIMATE > OCEAN/LAKE RECORDS > ISOTOPES
PALEOCLIMATE > OCEAN/LAKE RECORDS > MICROFOSSILS
PALEOCLIMATE > OCEAN/LAKE RECORDS > OXYGEN ISOTOPES
PALEOCLIMATE > OCEAN/LAKE RECORDS > RADIOCARBON
PALEOCLIMATE > PALEOCLIMATE RECONSTRUCTIONS > AIR TEMPERATURE RECONSTRUCTION
PALEOCLIMATE > PALEOCLIMATE RECONSTRUCTIONS > SEA SURFACE TEMPERATURE RECONSTRUCTION
ISO Topic Category
Data Set Progress
Distribution Media: ftp
University of Bremen
Fachbereich Geowissenschaften Universitat Bremen
Province or State: Bremen
Postal Code: 1 - 28359
Ruehlemann, C., S. Mulitza, P. J. Mueller, G. Wefer, and R. Zahn. 1999.
Warming of the tropical Atlantic Ocean and slowdown of thermohaline circulation during the last deglaciation. Nature, Vol. 402, pp. 511 - 514, 2 December 1999.
Stuiver, M., and P.J. Reimer, P.J. 1993.
Extended 14C data base and revised CALIB 3.0 14C age calibration program.
Radiocarbon, 35, 215-230.
Mueller, P.J., G. Kirst, G. Ruhland, I. von Storch, and A. Rosell-Mele. 1998. Calibration of the alkenone paleotemperature index UK'37 based on core-tops from the eastern South Atlantic and the global ocean (60°N-60°S).
Geochim. Cosmochim. Acta, 62, 1757-1772.
Creation and Review Dates
DIF Creation Date: 2006-12-22
Last DIF Revision Date: 2007-06-22