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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Autónoma de Baja California
2017
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=48054149001 |
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Inhaltsangabe:
- Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source Lydia Betty Ladah James J Leichter Anatoliy Filonov Iryna Tereshchenko Ciencias de la Tierra Mexico nutrients Gulf of Ulloa internal waves Baja California Although the semidiurnal internal tide dominates internal moti ons at all sites studied to date off Mexico, a diurnal signal w as detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency along this coastline. In this study, diur nal thermocline shoaling events were measured in kelp beds in late summer and fall of 2004, very near their southern limit in the Northern He misphere. Sub-thermocline water bathed the base of the kelp beds at a diurnal frequency. Nitrate concentrations up to 1.4 μmol·L –1 were found in this subthermocline water of almost 20 ºC enter ing the kelp beds, which is a much greater concentration of nitrate at this temperature tha n is typical for the California Current. Nitrate-rich pulses la sted from 35 min to 19 h and reduced bottom temperatures up to 5 ºC in 1 h. The per iodicity of temperature variability at the moorings showed sign ificant coherence with the diurnal variability in zonal winds (>95% confidence in terval) and was not coherent with the semidiurnal tide. We prop ose that wind- forced, diurnal internal motions may provide an important nutri ent source for primary producers during reduced upwelling perio ds and merit further study as a fertilization source in the southern part of the California Current System. 2017 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48054149001 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.43