Efecto de El Niño en la productividad primaria y temperatura superficial del mar del pacífico Colombiano

The primary productivity (PP) is the biological conversion of carbon dioxide into organic carbon compounds rich in energy, is a key index of phytoplankton production and is also related to fisheries production. Remotely Sensed data on Solar radiation, Chlorophyll and other Ocean parameters can be used for the estimation of this variable. The PP and other ocean variables such as sea surface temperature (SST) and chlorophyll concentration (Chl a) are affected by climatic events such as El Niño. The PP was calculated for the exclusive economic zone (EEZ) of the Colombian Pacific for the time period of 2003-2011 through Platt and Sathyendranath methodology which posits that PP is determined by the incident irradiance and concentration of photosynthetic pigments. The Rodionov method was used to detect abrupt changes in time series of PP, Chl-a and SST. Data on Chl a and SST were obtained from level 3 4km monthly resolution imagery from MODIS. Study identified higher PP value for the costal water compared to Open ocean. Changes in the time series ofChl a and SST related to the presence of El Niño, especially in 2009-2010, are not reflected in the PP time series, suggesting that changes in this variable may be influenced in greater proportion by ocean dynamics in the area such as currents, sea level anomalies and winds.Pages: 8751-875

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