Cited by 258Oceanographic and Atmospheric ProcessesMeteorological Phenomena and SimulationsMarine and coastal ecosystems

Relaxation from upwelling in the Coastal Ocean Dynamics Experiment

Send, Uwe, Beardsley, Robert C., Winant, Clinton D.·1987·Journal of Geophysical Research: Oceans

Abstract

A relaxation of the upwelling system on the northern California shelf occurs when upwelling‐favorable winds decay or reverse. Observations from the Coastal Ocean Dynamics Experiment are used to investigate this process, with emphasis on the near‐surface temperature evolution. Models of relaxation warming are tested for the surface layer (0–30 m) over midshelf, with the result that the surface heat flux and poleward alongshelf advection can account for the observed temperature behavior. Onshore advection of the upwelled isopycnal field is a relatively unimportant contribution. The warming patterns that are observed and which provide the gradients for the advective process have wedgelike shapes, warmest inshore and in the south of the experimental area. These patterns appear to be related to a topographic influence of Point Reyes, possibly through the generation of gradients in the wind field. Remote advection of warm water from as far south as San Francisco occasionally occurs as well. The nature of the relaxation mechanism has general implications. A new warm, saline, nutrient‐rich water mass may be formed in the surface layer. Since the warming processes are not the reverse of the cooling, an important asymmetry is present. It causes time‐variable upwelling to generate conditions very different from steady upwelling: a new upwelling front is created during each event, with upwelled water seaward of it, and reversed alongshelf flow contributes to the warming and exchange mech…

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Crossref · 10.1029/jc092ic02p01683

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Authors
Send, U., Beardsley, R. C., & Winant, C. D.
Venue
Journal of Geophysical Research: Oceans
Published
1987-02-15
Volume
92
Issue
C2
Pages
1683-1698
ISSN
0148-0227 (ISSN-L)
OpenAlex
W1982982087
Cited by
258
References
40
Citations by year
2026: 4 · 2025: 4 · 2024: 6 · 2023: 5 · 2022: 4 · 2021: 7 · 2020: 3 · 2019: 4 · 2018: 4 · 2017: 3 · 2016: 4 · 2015: 5 · 2014: 6 · 2013: 11 · 2012: 5
FWCI
28.29
Type
journal article
Language
en
Open access
closed
Locations
Journal of Geophysical Research Atmospheres (publishedVersion)
Funders
Curtin University of Technology
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
Keywords
coastal upwelling, upwelling relaxation, wind reversal, surface heat flux, surface layer temperature, upwelling front, mixed layer

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