Hurricane-forced upwelling and chlorophyll a enhancement within cold-core cyclones in the Gulf of Mexico

Details Hurricane-forced upwelling and chlorophyll a enhancement within cold-core cyclones in the Gulf of Mexico Hurricane-forced upwelling and chlorophyll a enhancement within cold-core cyclones in the Gulf of Mexico

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3218610w&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 18, CiteID L18610

Mathematics

Logic

37

Oceanography: Physical: Air/Sea Interactions (0312, 3339), Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Biological And Chemical: Phytoplankton, Oceanography: General: Physical And Biogeochemical Interactions

Scientific paper

Clear skies, subsequent to Hurricane Ivan's passage across the Gulf of Mexico in September 2004, provided a unique opportunity to investigate upper ocean responses to a major hurricane. Oceanic cyclonic circulation was rapidly intensified by the hurricane's wind field (59-62 m s-1), maximizing upwelling and surface cooling (3-7°C) in two large areas along Ivan's track. Upward isothermal displacements of 50-65 m, computed from wind stress and sea surface height changes, caused rapid ventilation of thermoclines and nutriclines, leading to phytoplankton blooms with peak concentrations 3-4 days later. Wind speed changes along Ivan's track demonstrated that the cool waters (20-26°C) provided immediate negative feedback to the hurricane's intensity. Although our study focused on a relatively small ocean area, it revealed that mesoscale cyclones, in addition to warm anticyclones, may play an important role in producing along-track hurricane intensity changes.

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