Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 11, Pages 5812-5820Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL068945
Keywords
mesoscale activity; bio-physical interactions; plankton ecosystem; California Current System; coastal upwelling system
Categories
Funding
- CCE-LTER program (NSF DEB) [0832652]
- CNES
- Division Of Ocean Sciences
- Directorate For Geosciences [1026607] Funding Source: National Science Foundation
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The California Current System (CCS) has intense mesoscale activity that modulates and exports biological production from the coastal upwelling system. To characterize and quantify the ability of mesoscale eddies to affect the local and regional planktonic ecosystem of the CCS, we analyzed a 10 year-long physical-biological model simulation, using eddy detection and tracking to isolate the dynamics of cyclonic and anticyclonic eddies. As they propagate westward across the shelf, cyclonic eddies efficiently transport coastal planktonic organisms and maintain locally elevated production for up to 1year (800km offshore). Anticyclonic eddies, on the other hand, have a limited impact on local production over their similar to 6month lifetime as they propagate 400km offshore. At any given time similar to 8% of the model domain was covered by eddy cores. Though the eddies cover a small area, they explain similar to 50 and 20% of the transport of nitrate and plankton, respectively.
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