Repositorio Digital Marítimo, Fluvial y Costero

Casanova Rosero, Robinson Fidel and Zambrano Ortiz, Mónica María and Latandret Solana, Sadid Augusto and Guerrero Zorrilla, Diego Fernando and Suárez Vargas, Nigireth Paola and Albán Illera, Cindy Bibiana. (2019). Spatial behavior of some physicochemical variables in the Colombian Pacific during the Colombian Pacific Basin Oceanagraphic Cruise (CPB XLIX). Boletín Científico CIOH (38). pp. 13-30. doi https://doi.org/10.26640/22159045.2019.520

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Abstract

The spatial behavior of some physicochemical variables (salinity, temperature, dissolved oxygen), clorofila-a and nutrients (ammonia, nitrites, nitrates, phosphates and silicates) was evaluated during the oceanographic cruise Cuenca Pacífica Colombiana CPC XLIX, carried out between September 17th and October 6th 2010, considered as a period of cold conditions, aboard the ship ARC Providencia, in the area from Colombian Pacific Basis, bounded by 77° 30´ - 84° 00´ W and 2° 00´- 6° 30´ N. The analysis looked forward to generate information related to the variability of the physicochemical parameters along horizontal and vertical profiles in the Colombian Pacific, contributing to the knowledge for future research, recognizing its potential, and input environmental management of marine and coastal ecosystems. Marked changes were detected in the area at the profile between 30 m and 50 m in the variables. Average pH decreased from 8.25 ± 0.03 to 7.90 ± 0.07, the dissolved oxygen decreased from 6.42 ± 0.19 mg/L to 2.36 ± 0.51 mg/L, while the average phosphate increased from 0.25 ± 0.14 μM to 1.69 ± 0.66 μM, similarly nitrates increased from 0.80 ± 0.81 μM to 18.45 ± 6.51 μM and silicates from 8.59 ± 9.94 to 16.15 ± 6.53 μM. Mean levels of chlorofila-a were about 0.45 mg/m3 in 50 m with marked differences at 75 m where it was halved. The temperature changed from 26.5 ± 0.9 °C at 30 m to 18.8 ± 2.9 °C at 50 m with a maximum rate of change of 0.387 °C/m, coinciding with the thermocline, oxycline and nutricline. This establishes that the first 50 m layer is a zone with high active interaction in the processes of matter and energy production, and therefore of biogeochemical processes. In this way the lower layer to the thermocline is established as the source of supply of nutrients to the surface, and hence its movement and control of productivity processes.

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Item Type:	Article
Uncontrolled Keywords:	Cuenca Pacífica Colombiana. Termoclina. Nutriclina. Haloclina. Nutrientes. Variables fisicoquímicas
Geographical coverage :	Colombia. Pacífico
Depositing User:	Dirección General Marítima
ISSN:	2215-9045
Official URL:	https://ojs.dimar.mil.co/index.php/CIOH/article/vi...
Identification Number:	https://doi.org/10.26640/22159045.2019.520

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