Decadal-scale variability in long-range atmospheric transport to the Summit of the Greenland Ice Sheet

Details Decadal-scale variability in long-range atmospheric transport to the Summit of the Greenland Ice Sheet Decadal-scale variability in long-range atmospheric transport to the Summit of the Greenland Ice Sheet

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..481k&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 4, p. 481-484

Physics

1

Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere-Constituent Transport And Chemistry, Global Change: Atmosphere

Scientific paper

Ice cores extracted from the Summit of the Greenland Ice Sheet date to >110 kyr b.p. and reveal fluctuations in chemical and physical characteristics on time scales ranging from days to millenia. Long-range atmospheric transport patterns contribute substantially to variability in both airborne and snow-deposited chemical species, and are thus one of the most important considerations in assessing climate variability preserved in polar ice cores. Here we present new evidence of decadal-scale climate variability through an analysis of 44 years of modeled, 10-day air trajectories arriving daily at Summit, Greenland. Trajectory residence times over specific upwind regions reveal interannual oscillations with periods of 4-14 years, and are correlated with three climate teleconnection indices. Our results suggest that the observed link between upstream source regions and the phases of large-scale climate oscillations may be exploited to further understand paleoclimatic oscillations.

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