Coastal cooling and increased productivity in the main upwelling zone off Peru since the mid-twentieth century - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2011

Coastal cooling and increased productivity in the main upwelling zone off Peru since the mid-twentieth century

Abstract

We reconstructed a high-resolution, alkenone-based sea surface temperature (SST) record spanning the last ca. 150 years, from a sediment core retrieved within the main upwelling zone off Peru. A conspicuous SST decline is evidenced since the 1950s despite interdecadal SST variability. Instrumental SST data and reanalysis of ECMWF ERA 40 winds suggest that the recent coastal cooling corresponds mainly to an intensification of alongshore winds and associated increase of upwelling in spring. Consistently, both proxy and instrumental data evidence increased productivity in phase with the SST cooling. Our data expand on previous reports on recent SST cooling in other Eastern Boundary upwelling systems and support scenarios that relate coastal upwelling intensification to global warming. Yet, further investigations are needed to assess the role of different mechanisms and forcings (enhanced local winds vs. spin-up of the South Pacific High Pressure cell).
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hal-00755104 , version 1 (29-10-2021)

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Dimitri Gutiérrez, Ioanna Bouloubassi, Abdel Sifeddine, Sara Purca, Katerina Goubanova, et al.. Coastal cooling and increased productivity in the main upwelling zone off Peru since the mid-twentieth century. Geophysical Research Letters, 2011, 38, pp.07603. ⟨10.1029/2010GL046324⟩. ⟨hal-00755104⟩
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