Mesoscale eddies and high chlorophyll concentrations off central Chile (29°-39°S)

The offshore propagation of mesoscale eddies contributes significantly to expanding the area of high chlorophyll concentration beyond the coastal upwelling center as shown by satellite data of chlorophyll, wind stress, sea level anomalies between (1997–2003) off central Chile. Mesoscale eddies (∼6.4...

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Bibliographic Details
Published in:Geophysical research letters 2007-06, Vol.34 (12), p.n/a
Main Authors: Correa-Ramirez, Marco A., Hormazábal, Samuel, Yuras, Gabriel
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
mesoscale eddies
Peru-Chile eastern boundary current system
satellite chlorophyll
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Summary:The offshore propagation of mesoscale eddies contributes significantly to expanding the area of high chlorophyll concentration beyond the coastal upwelling center as shown by satellite data of chlorophyll, wind stress, sea level anomalies between (1997–2003) off central Chile. Mesoscale eddies (∼6.45 × 103 km2) formed near the coastal zone in spring‐summer have mean seaward speeds of ∼1.68 km d−1 and reach ∼500 km offshore in winter. Chlorophyll concentrations along eddy paths are elevated by nutrient pumping and by nutrients and/or chlorophyll transported from the coastal zone. Eddies make up >50% of the winter (weak upwelling) chlorophyll peak in the coastal transition zone. Coupling between eddies and upwelling extends central Chile's high productivity area offshore and prolongs it towards winter.
ISSN:0094-8276
1944-8007
DOI:10.1029/2007GL029541