Ocean circulation likely to blame for severity of 2018 red tide around Florida

ScienceDaily | 4/18/2019 | Staff
lhumara (Posted by) Level 3
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While traces of the bloom are always present offshore in the Gulf of Mexico, a new study published in the Journal of Geophysical Research-Oceans finds ocean circulation made 2018 the worst year for red tide in more than a decade.

By affecting the nutrient levels offshore, marine scientists at the University of South Florida (USF) showed that the ocean circulation played a controlling role. If nutrient levels offshore are high in spring due to the upwelling of deeper ocean waters, then there tends not to be major red tide blooms along the shoreline in fall. Such upwelling did not occur in winter and spring of 2018, allowing a new bloom to form offshore in spring and summer 2018. An upwelling circulation then set in toward the end of July, ensuring that the newly formed bloom would be carried to the coastline along the bottom where it reinforced what had already been in place from 2017.

Storm - Gordon - Circulation - Bloom - Florida

Tropical Storm Gordon temporarily disrupted the upwelling circulation, allowing some of the new bloom to be carried to the Florida Panhandle. After the passage of Gordon, the upwelling circulation then allowed the bloom to be transported offshore at the surface to eventually be carried to the Florida's east coast by the Gulf Stream. Thus, the rare occurrence of Karenia brevis at three different locations (Florida's west, Panhandle...
(Excerpt) Read more at: ScienceDaily
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