Timing of millennial-scale climate change in
Antarctica and Greenland during the last glacial period

Timing of millennial-scale climate change in
Antarctica and Greenland during the last glacial period

Science, Volume 291, 109-112, 5 January 2001.

Thomas Blunier
Princeton University
Ed Brook
Washington State University

ABSTRACT:
A precise relative chronology for Greenland and West Antarctic paleotemperature is extended to 90,000 years ago, based on correlation of atmospheric methane records from the Greenland Ice Sheet Project 2 and Byrd ice cores. Over this period, the onset of seven major millennial-scale warmings in Antarctica preceded the onset of Greenland warmings by 1500 to 3000 years. In general, Antarctic temperatures increased gradually while Greenland temperatures were decreasing or constant, and the termination of Antarctic warming was apparently coincident with the onset of rapid warming in Greenland. This pattern provides further evidence for the operation of a "bipolar see-saw" in air temperatures and an oceanic teleconnection between the hemispheres on millennial time scales.

DATA:
Download the Isotope and
Methane data and description from the WDC Paleo Archive.

Fig. 1.
Isotopic and CH4 data from Greenland and Antarctica on the GISP2 time scale. Dashed lines indicate the onset of major D-O events. (A) d18Oice from GISP2, Greenland. (B) d18Oice from Byrd station, West Antarctica (23). (C) CH4 data from GISP2 and GRIP. Crosses and dots are from GISP2; the solid gray line is from GRIP. The solid line runs through the data used for the synchronization: GISP2 (black line) up to 45.5 ka and GRIP data (gray line) from 45.5 ka to the Holocene. (D) CH4 data from Byrd station. Click figure for color .PDF version.

To read or view the full study, please visit the Science website.
It was published in Science Volume 291, 109-112, 5 January 2001.


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5 Jan 2001