Offshore transport of particulate organic carbon in the California Current System by mesoscale eddies

The California Current System is characterized by upwelling and rich mesoscale eddy activity. Cyclonic eddies generally pinch off from meanders in the California Current, potentially trapping upwelled water along the coast and transporting it offshore. Here, we use satellite-derived measurements of...

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Published in:Nature communications 2019-10, Vol.10 (1), p.4940-8, Article 4940
Main Authors: Amos, Caitlin M., Castelao, Renato M., Medeiros, Patricia M.
Format: Article
Language:English
Subjects:
704/106/829/2737
704/829/2737
Carbon
Coastal waters
Coasts
Cyclones
Eddies
Eddy currents
Enrichment
Humanities and Social Sciences
Meanders
multidisciplinary
Ocean circulation
Organic carbon
Particulate organic carbon
Science
Science (multidisciplinary)
Transport
Trapping
Upwelling
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description The California Current System is characterized by upwelling and rich mesoscale eddy activity. Cyclonic eddies generally pinch off from meanders in the California Current, potentially trapping upwelled water along the coast and transporting it offshore. Here, we use satellite-derived measurements of particulate organic carbon (POC) as a tracer of coastal water to show that cyclones located offshore that were generated near the coast contain higher carbon concentrations in their interior than cyclones of the same amplitude generated offshore. This indicates that eddies are in fact trapping and transporting coastal water offshore, resulting in an offshore POC enrichment of 20.9 ± 11 Gg year −1 . This POC enrichment due to the coastally-generated eddies extends for 1000 km from shore. This analysis provides large-scale observational-based evidence that eddies play a quantitatively important role in the offshore transport of coastal water, substantially widening the area influenced by highly productive upwelled waters in the California Current System. The California Current System is characterized by wind-driven upwelling and by rich mesoscale eddy activity, resulting in a highly productive ecosystem. Here the authors show that offshore cyclonic eddies which were generated near the coast contain higher carbon concentrations in their interior than eddies of the same amplitude generated locally offshore.
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subjects 704/106/829/2737
704/829/2737
Carbon
Coastal waters
Coasts
Cyclones
Eddies
Eddy currents
Enrichment
Humanities and Social Sciences
Meanders
multidisciplinary
Ocean circulation
Organic carbon
Particulate organic carbon
Science
Science (multidisciplinary)
Transport
Trapping
Upwelling
title Offshore transport of particulate organic carbon in the California Current System by mesoscale eddies
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