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Hypoxic events in coastal regions have been increasing over the last several decades across the globe. These events have been documented along the east and gulf coasts of the United States, in the Baltic region, and off the coast of Japan. The low occurrence of these events in the tropics is likely due to lack of consistent monitoring results in these regions. Hypoxic events have been classified as either persistent (occurring all year round), periodic (occurring at different times) or seasonal (occurring at a certain time of year).
The pattern of dissolved oxygen in bottom water shows many areas with low oxygen concentrations, particularly in Southern and Eastern Asia, the Pacific coast of Central America, the red sea and the Baltic Sea. There is no clear correlation between the location of observed hypoxic events and global bottom water oxygen concentration, reflecting a difference in spatial and temporal scale between the two data sources.
The location of hypoxic eve...

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