Chemical Parameters Before a Red Tide Bloom, Gulf of Tehuantepec, Mexico

by Felipe Vázquez, UNAM, Mexico,
Magdalena Turner, UNAM, Mexico,
Alfonso Gutierrez, UNAM, Mexico,
Hector Alexander, UNAM, Mexico,

Document Type: Proceeding Paper

Part of: Coastal Zone '91


Gulf of Tehuantepec in the Mexican Pacific is characterized by 'north winds' (Tepehuanos) from October through March. These winds form a upwelling area in front Oaxaca and Chiapas coasts. Deep waters with high content of micronutrient elements reach the surface. Some biological species progress in this conditions for example: Gymnodinium breve and Gonyaulax polyhedra give rise to red tide blooms. This work report the results obtained during the expedition developed in November 1989 on board R/V EL PUMA. High concentrations of micronutrient elements and low concentrations of dissolved oxygen were determined in front Oaxaca coastal zone. Values of pH, salinity, total alkalinity and degree of saturation of calcite and aragonite as a function of depth were determined also. The diffusion of micronutrient elements along this area were interpreted with a hydrodynamic model.

Subject Headings: Chemicals | Parameters (statistics) | Tides | Gulfs | Developing countries | Coastal environment | Dissolved oxygen | Water pollution | Mexico

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