Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409601d&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 9, CiteID L09601
Physics
3
Biogeosciences: Climate Dynamics (1620), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Oceanography: General: Equatorial Oceanography, Paleoceanography: Corals (4220), Paleoceanography: Geochemical Tracers
Scientific paper
We analyzed radiocarbon in annual coral bands from the Galápagos Islands in the tropical east Pacific to understand natural variability of past ocean circulation associated with climate change. Variability was observed on El Niño timescales (3-7 years) as well as at decadal and multi-decadal periods. Low radiocarbon levels persisted for ten years during the early 1600s and for sixteen years during the early 1800s, both coincident with periods of high volcanic aerosol loading in the atmosphere from massive eruptions. Intensification of tropical circulation at this time may be linked to climatically-controlled changes in the structure of the tropical thermocline that is responsible for delivering cool, upwelled waters to the tropical east Pacific.
Beaupré Steven R.
Druffel Ellen R. M.
Dunbar Robert B.
Griffin Sheila
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