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

doi: 10.1029/2010gl046324
handle: 20.500.12866/10912
[1] 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).
[SDU.STU.GP] Sciences of the Universe/Earth Sciences/Geophysics, 550, Eastern Boundary Current, [PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], [PHYS.PHYS.PHYS-GEO-PH] Physics/Physics/Geophysics, processes, Wind, High Resolution, 551, Oceanography, Global Warming, [ SDU.STU.GP ] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Coastal Upwelling, Instrumental Data, Peru, 0414, Atmospheric Temperature, Surface Waters, Productivity, and modeling (0412, Alkenones, Coastal Engineering, Oceanography: Biological and Chemical: Biogeochemical cycles, [ SDE.MCG ] Environmental Sciences/Global Changes, Impacts of global change (1225 [Global Change], [SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Global Change: Impacts of global change (1225, Sediment Core, 0793, https://purl.org/pe-repo/ocde/ford#1.05.04, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Twentieth Century, [SDE.MCG]Environmental Sciences/Global Changes, Climate Change, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Reanalysis, Spin-Up, Oceanography: General: Upwelling and convergences (4964), Sea Surface Temperature (SST), [ PHYS.PHYS.PHYS-GEO-PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], High Pressure Cells, Sea Surface Temperature, 4321), Upwelling, Biological and Chemical: Biogeochemical cycles [Oceanography], Increased Productivity, Upwelling Systems, Interdecadal, Cooling Systems, In-Phase, Different Mechanisms, General: Upwelling and convergences (4964) [Oceanography], Forcings, [SDE.MCG] Environmental Sciences/Global Changes, Humboldt Current System, High Pressure System, 1615, Anoxic Sediments, 4912)
[SDU.STU.GP] Sciences of the Universe/Earth Sciences/Geophysics, 550, Eastern Boundary Current, [PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], [PHYS.PHYS.PHYS-GEO-PH] Physics/Physics/Geophysics, processes, Wind, High Resolution, 551, Oceanography, Global Warming, [ SDU.STU.GP ] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Coastal Upwelling, Instrumental Data, Peru, 0414, Atmospheric Temperature, Surface Waters, Productivity, and modeling (0412, Alkenones, Coastal Engineering, Oceanography: Biological and Chemical: Biogeochemical cycles, [ SDE.MCG ] Environmental Sciences/Global Changes, Impacts of global change (1225 [Global Change], [SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Global Change: Impacts of global change (1225, Sediment Core, 0793, https://purl.org/pe-repo/ocde/ford#1.05.04, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Twentieth Century, [SDE.MCG]Environmental Sciences/Global Changes, Climate Change, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Reanalysis, Spin-Up, Oceanography: General: Upwelling and convergences (4964), Sea Surface Temperature (SST), [ PHYS.PHYS.PHYS-GEO-PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], High Pressure Cells, Sea Surface Temperature, 4321), Upwelling, Biological and Chemical: Biogeochemical cycles [Oceanography], Increased Productivity, Upwelling Systems, Interdecadal, Cooling Systems, In-Phase, Different Mechanisms, General: Upwelling and convergences (4964) [Oceanography], Forcings, [SDE.MCG] Environmental Sciences/Global Changes, Humboldt Current System, High Pressure System, 1615, Anoxic Sediments, 4912)
