Late Holocene climate change in the North Atlantic and equatorial Africa: Millennial-scale ITCZ migration

Details Late Holocene climate change in the North Atlantic and equatorial Africa: Millennial-scale ITCZ migration Late Holocene climate change in the North Atlantic and equatorial Africa: Millennial-scale ITCZ migration

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217705r&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 17, CiteID L17705

Physics

3

Global Change: Climate Dynamics (0429, 3309), Global Change: Regional Climate Change, Global Change: Water Cycles (1836), Paleoceanography: Abrupt/Rapid Climate Change (1605), Paleoceanography: Continental Climate Records

Scientific paper

Climate proxy data and numerical models suggest that latitudinal displacements of the Intertropical Convergence Zone (ITCZ) occur during millennial-scale cold events in the North Atlantic region, but the potential effects of these ITCZ movements on the climate of equatorial regions are unclear. Here we present a 5400-year geochemical record of rainfall and drought from Lake Edward in equatorial Africa. We observe a non-linear correlation in which drought in equatorial Africa occurs during both cold and warm extremes in the North Atlantic's 1500-year quasi-cycle. We propose that this relationship occurs due to northward/southward displacement of the ITCZ from its equatorial mean position during warm/cold events. Our results show that millennial-scale high-latitude climate events are linked to changes in equatorial terrestrial climate even during the late Holocene and suggest important constraints on the mechanisms linking tropical and extratropical climate variability.

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