Cited by 107Oceanographic and Atmospheric ProcessesClimate variability and modelsMarine and fisheries research

Evolution of upwelling systems coupled to the long-term variability in sea surface temperature and Ekman transport

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Pardo, PC, Padín, XA, Gilcoto, M, Farina-Busto, L, Pérez, FF·2011·Climate Research

Abstract

In the early 1990s it was hypothesized that the global warming process would produce an increase in sea-land temperature gradients and, subsequently, enhance the wind patterns responsible for coastal upwelling.Hence, an increase in the intensity of coastal upwelling was expected in the main upwelling ecosystems around the world.However, recently published analyses of the evolution of coastal upwelling processes have shown contradictory evidence.For this reason, time series of sea-surface temperature (SST) and the upwelling index I w extracted from the NCEP/NCAR reanalysis project database and covering the last 6 decades were studied.The time series analyses focused on the northern part of the Canary Current System and included comparisons with upwelling systems off NW Africa, California, Benguela and Peru.Climatic indices, including the Atlantic Multidecadal Oscillation, Eastern Atlantic Pattern, Interdecadal Pacific Oscillation Index and North Atlantic Oscillation, were investigated to explain the variability found in the NCEP/NCAR time series.A general sea-surface warming and weakening of the upwelling intensity in the Iberian/ Canary and NW African regions were found and these have intensified in the last 4 decades.These trends were clearly observed in winter and autumn for both regions, and a weakening in the upwelling intensity was also detected in summer in the NW African region.The North Atlantic Oscillation and the Eastern Atlantic Pattern indices correlated with both SST and I w , particularly in winter and spring, and also with both the Iberian/ Canary and NW African regions.No clear trend was found for the California region, while, conforming to the hypothesis, the Benguela region exhibited enhancement of upwelling, but only slight sea-surface warming.In contrast, the Peru region indicated a weakening of upwelling accompanied by marginal sea-surface warming.

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  1. Barton ED (1998) Eastern boundary of the North Atlantic: Northwest Africa and Iberia. Coastal segment (18, E). In: Robinson A, Brink KH (eds) The sea, Vol 11. John Wiley, New York, p 633-657

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Authors
Pardo, P., Padín, X., Gilcoto, M., Farina-Busto, L., & Pérez, F.
Affiliations
Instituto de Investigacións Mariñas (ES)
Venue
Climate Research
Published
2011-08-30
Volume
48
Issue
2
Pages
231-246
ISSN
  • 0936-577X (ISSN-L)
  • 1616-1572
OpenAlex
W1965155068
Cited by
107
References
36
Citations by year
2026: 5 · 2025: 7 · 2024: 9 · 2023: 8 · 2022: 12 · 2021: 12 · 2020: 6 · 2019: 9 · 2018: 3 · 2017: 5 · 2016: 7 · 2015: 3 · 2014: 7 · 2013: 6 · 2012: 3
FWCI
4.74
Type
journal article
Language
en
Open access
Locations
  • Climate Research (publishedVersion)
  • eCite Digital Repository (University of Tasmania) (submittedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
Xunta de Galicia
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
Keywords
coastal upwelling, sea surface temperature, Ekman transport, upwelling index, global warming, North Atlantic Oscillation, Atlantic Multidecadal Oscillation, Interdecadal Pacific Oscillation, Benguela upwelling, Peruvian upwelling, climate variability

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