Spatio-temporal assessment of the impacts of the trends in physical and biogeochemical parameters on the primary production of the Gulf of Guinea.

A negative trend is seen around the coast of Nigeria down to Cameroon despite the presence of major rivers as well as the Niger Delta emphasizing the predominance of upwelling over the river supply from land in NO 3 distribution.

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An increasing trend of DO is seen in most parts of the GoG with higher values seen from Togo down to the southwestern part of Nigeria.

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Generally, in the coastal areas of the GoG, the NO 3 has been experiencing a decreasing trend between 1993 and 2020.

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The only exception to this decreasing trend is the region surrounding the entry point of the Volta River into the Atlantic Ocean which shows a positive trend.

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This works by giving an output of 1 if true i.e., the trend is statistically significant and zero if false when one can reject the hypothesis of the presence of a significant trend.

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