Enhancement of coastal upwelling and interdecadal ENSO-like variability in the Peru-Chile Current since late 19th century
Article first published online: 10 JUL 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 13, July 2007
How to Cite
2007), Enhancement of coastal upwelling and interdecadal ENSO-like variability in the Peru-Chile Current since late 19th century, Geophys. Res. Lett., 34, L13607, doi:10.1029/2006GL028812., , , , and (
- Issue published online: 10 JUL 2007
- Article first published online: 10 JUL 2007
- Manuscript Accepted: 16 MAY 2007
- Manuscript Revised: 12 APR 2007
- Manuscript Received: 4 DEC 2006
- coastal upwelling;
- Humboldt Current System
 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.