期刊
GEOPHYSICAL RESEARCH LETTERS
卷 34, 期 13, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2006GL028812
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Secular trends in coastal upwelling proxies from a sediment record at 23 degrees 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 Nino-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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