Coastal-offshore exchange of organic matter across the Cape Ghir filament (NW Africa) during moderate upwelling

Abstract : The net coastal-ocean export of particulate organic carbon (POC), dissolved organic carbon (DOC) and chlorophyll a is studied in August 2009 at the Cape Ghir filament, a recurrent feature located within the NW African upwelling system. The estimated flux of excess total organic carbon (the non-refractory pools of DOC and POC) is about 2.1 x 109 kg C y- 1. DOC represents ~ 70% of the excess organic carbon in August 2009, during moderate upwelling. Assuming this flux is representative of the range within a typical year, the yearly offshore net transport of total organic carbon would represent at least 29% of the primary production in this area. Since the Cape Ghir filament may extend hundreds of km offshore, the associated seaward flux of organic carbon would contribute to the high microbial respiration rates reported from the nearby oligotrophic open ocean region. Our results illustrate that, when considering the regional carbon budgets of eastern boundary regions, it is imperative to take account of the offshore transport of organic matter in the numerous and recurrent upwelling filaments.
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https://hal.archives-ouvertes.fr/hal-01221413
Contributor : Mar Benavides <>
Submitted on : Wednesday, October 28, 2015 - 2:09:45 AM
Last modification on : Monday, September 10, 2018 - 2:58:03 PM

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  • HAL Id : hal-01221413, version 1

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Yeray Santana-Falcón, Mar Benavides, Pablo Sangrà, Evan Mason, Desmond Barton Eric, et al.. Coastal-offshore exchange of organic matter across the Cape Ghir filament (NW Africa) during moderate upwelling. Journal of Marine Systems, Elsevier, 2015. ⟨hal-01221413⟩

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