Cited by 205Oceanographic and Atmospheric ProcessesCoastal and Marine DynamicsMeteorological Phenomena and Simulations

Mesoscale patterns in the Cape São Vicente (Iberian Peninsula) upwelling region

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Relvas, Paulo, Barton, Eric D.·2002·Journal of Geophysical Research: Oceans

Abstract

The coastal upwelling region near Cape São Vicente, the southwestern tip of the Iberian Peninsula where the southern zonal coast meets the meridional western coast, was studied using over 1200 advanced very high resolution radiometer (AVHRR) satellite images of sea surface temperature and time series of sea level height, wind velocities, and nearshore sea surface temperature recorded at coastal sites within 200 km of the cape. Summer upwelling is more intense and persistent off the western coast than off the southern coast, where a recurrent warm coastal countercurrent flows westward, and at times turns northward along the western coast after reaching the cape. In this region the equatorward current jet of cold water upwelled off the western coast is no longer bounded by a coast. Three preferred directions for the spreading of this water are identified. The most persistent is eastward along the southern shelf break and slope, possibly merging with waters previously upwelled locally, which becomes separated from shore by the coastal progression of the warmer counterflow. The second preferred direction results in the southward development of a cold filament feature fed by cold waters upwelled farther north and represents the southernmost extent of the intense coastal upwelling jet, which overshoots the cape. The least frequent feature to develop is a cold filament that grows westward at the latitude of the cape, appearing to result from the meandering of the equatorward jet. The coastal countercurrent is seen to interact with the equatorward jet at times of relaxation, not only by separating the cold upwelled water from the coast but, when it is energetic enough, breaking westward offshore through the equatorward cold flow and separating the eastward and southward cold features from the upcoast cold waters. Empirical evidence shows the presence of an alongshore pressure gradient, stronger in summer, driving the coastal progression of the warm counterflow. Wind forcing plays an important role in the circulation by augmenting or diminishing the effect of the preexisting alongshore pressure gradients. The extent of the progression of the warm coastal countercurrent along the southern and western coast is dictated by the the strength of the upwelling favorable wind stress, which is able to balance and reverse the alongshore flow, at least in the upper layers.

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Crossref · 10.1029/2000jc000456

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  • The divergence between the SST patterns in Figure 8d,f can be attributed to variations in the intensity of upwelling processes occurring near Cape São Vicente.

    “The divergence between the SST patterns in Figure 8d,f can be attributed to variations in the intensity of upwelling processes occurring near Cape São Vicente, as described by Relvas and Barton [16].”

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Research works printed but not linked: 2

  1. Fiúza A. F. G. Hidrologia e dinãmica das águas costeiras de Portugal Ph.D. thesis Univ. de Lisboa Lisbon Portugal 1984.
  2. Hidrográfico I., 1996, Tabelas de Marés 1997

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Authors
Relvas, P., & Barton, E. D.
Affiliations
  • Centro de Investigação Marinha e Ambiental (PT)
  • University of Wales (GB)
Venue
Journal of Geophysical Research: Oceans
Published
2002-10
Volume
107
Issue
C10
ISSN
0148-0227 (ISSN-L)
OpenAlex
W2103400039
Cited by
205
References
55
Citations by year
2026: 10 · 2025: 9 · 2024: 15 · 2023: 5 · 2022: 9 · 2021: 13 · 2020: 9 · 2019: 8 · 2018: 6 · 2017: 15 · 2016: 15 · 2015: 11 · 2014: 8 · 2013: 5 · 2012: 6
FWCI
2.98
Type
journal article
Language
en
Open access
Locations
  • Journal of Geophysical Research Atmospheres (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
  • Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT) (submittedVersion, other-oa)
Funders
  • University of Dundee
  • Natural Environment Research Council
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Coastal and Marine Dynamics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
Keywords
coastal upwelling, cold filaments, alongshore pressure gradient, wind forcing, sea surface temperature, sea level, shelf break, Iberian Peninsula coast

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