A novel method to study the phase relationship between Antarctic and Greenland climate

Details A novel method to study the phase relationship between Antarctic and Greenland climate A novel method to study the phase relationship between Antarctic and Greenland climate

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qclm4c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 17, pp. CLM 4-1, CiteID 1899, DOI 10.1029/2003GL017838

Mathematics

Logic

7

Meteorology And Atmospheric Dynamics: Paleoclimatology, Oceanography: General: Paleoceanography, Hydrology: Glaciology (1863), Oceanography: Biological And Chemical: Stable Isotopes, Global Change: Climate Dynamics (3309)

Scientific paper

A classical method for understanding the coupling between northern and southern hemispheres during millennial-scale climate events is based on the correlation between Greenland and Antarctic ice core records of atmospheric composition. Here we present a new approach based on the use of a single Antarctic ice core in which measurements of methane concentration and inert gas isotopes place constraints on the timing of a rapid climate change in the North and of its Antarctic counterpart. We applied it to the Marine Isotope Stage (MIS) 5d/c transition early in the last glaciation ~108 ky BP. Our results indicate that the Antarctic temperature increase occurred 2 ky before the methane increase, which is used as a time marker of the warming in the Northern Hemisphere. This result is in agreement with the ``bipolar seesaw'' mechanism used to explain the phase relationships documented between 23 and 90 ky BP [Blunier and Brook, 2001].

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