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The Canary Current : studies of an upwelling system

Authors
  • Herbland, Alain
  • Voituriez, B.
Publication Date
Jan 01, 1982
Source
Horizon / Pleins textes
Keywords
Language
French
License
Unknown
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Abstract

A long duration station (60 hours) was covered where an active upwelling was expected to occur (Cap Timiris area, Mauritania). As soon as the wind enhanced (from 4-5 m/s to 11 m/s) the surface temperature decreased and nitrate concentration increased. A highly significant negative correlation was found between the temperature at 10 m and the time (r= -0.966, n=21). Surface heating due to solar irradiation occured each day. The mean decrease of surface temperature was one degre per day over 60 hours. The maximum upward velocity determined from the vertical displacement of the isotherms and nitrate isolines over 15 h intervals was about 4.5 x 10-2 cm/s. From that speed, the nitrate input in the euphotic layer is calculated and the potential production estimated at 21 g C/m2/d. From that value and in situ primary production measurements, the upwelling efficiency is evaluated at 30-40% for the first level of the food chain. (Résumé d'auteur)

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