Evaluación temporal de parámetros fisicoquímicos en una estación oceánica frente a la Bahía de Tumaco

Abstract

The paper evaluated the temporal behavior of some physicochemical parameters (salinity, temperature, dissolved oxygen and chlorophyll) and nutrients associated oceanographic conditions in the Pacific, the evaluation was performed based at the results of a biweekly monitoring performed during 2008 to 2009 an oceanic station located off the Bay of Tumaco. The observed variability in these parameters is attributed to factors related to the influence of the migration of the Intertropical Convergence Zone (ITCZ), the wind direction and current Colombia. In this respect a marked change in the normal behavior of the isotherm and isohaline of the column appeared in the first quarter of each year, presenting a delta of 7oC for temperature and 4 ups for salinity, attributable in part to the emergence of cold water currents caused by subsurface depth currents (currents generated below 100 meters) and favored by the direction of the winds at the time going in a northeasterly direction due to movement of the ITCZ, this emergence associate a increased concentrations of inorganic nutrients, which reached levels of up to 5 μg-at N-NO3-/L for nitrate, 0.4 μg-at P-(PO4)-3/L to phosphate, and 1 μg-at N-NH4+/L for ammonium, higher than those normally presented at the point of study, the changes in the physicochemical conditions of the area were more intensely during the second year of monitoring (2009), also manifest with an increase in the concentration of chlorophyll a and dissolved oxygen, with values up to 2.1 mg/m3 and 7.25 mg O2/L respectively.