Enhancement of coastal upwelling and interdecadal ENSO-like variability in the Peru-Chile Current since late 19th century

Details Enhancement of coastal upwelling and interdecadal ENSO-like variability in the Peru-Chile Current since late 19th century Enhancement of coastal upwelling and interdecadal ENSO-like variability in the Peru-Chile Current since late 19th century

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3413607v&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 13, CiteID L13607

Physics

9

Global Change: Oceans (1616, 3305, 4215, 4513), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: Physical: Enso (4922), Paleoceanography: Sea Surface Temperature, Paleoceanography: Upwelling (4279)

Scientific paper

Secular trends in coastal upwelling proxies from a sediment record at 23°S encompassing 250 years reveal two distinct stages separated by a transition period between AD 1820 and 1878. Persistent interdecadal variability that roughly follows the Pacific Decadal Oscillation is accompanied by intensification of upwelling-favourable coastal winds and decreased coastal sea surface temperature since AD 1878. We propose that an increased land-sea thermal contrast along the arid coast of northern Chile and Peru intensifies the equatorward wind stress due to reduced mean low-cloud cover, resulting in enhanced primary and export production during interdecadal El Niño-like conditions. This mechanism overcompensates for the overall effect of a regional surface warming secular trend in the Peru-Chile Current System, providing a novel insight on physical and biogeochemical feedbacks of coastal upwelling ecosystems to global warming.

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