Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
