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- Title
Role of Iron in the Marquesas Island Mass Effect.
- Authors
Raapoto, Hirohiti; Martinez, Elodie; Petrenko, Anne; Doglioli, Andrea; Gorgues, Thomas; Sauzède, Raphaëlle; Maamaatuaiahutapu, Keitapu; Maes, Christophe; Menkes, Christophe; Lefèvre, Jérôme
- Abstract
A remarkable chlorophyll‐a concentration (Chl, a proxy of phytoplankton biomass) plume can be noticed on remotely sensed ocean color observations at the boundary separating the equatorial mesotrophic from the subtropical oligotrophic waters in the central South Pacific Ocean. This prominent biological feature is known as the island mass effect of the Marquesas archipelago. Waters surrounding these islands present high macronutrient concentrations but an iron depletion. In this study, the origin of Chl enhancement is investigated using a modeling approach. Four simulations based on identical physical and biogeochemical forcings but with different iron sources are conducted and analyzed. Only simulations considering an iron input from the island sediments present similar patterns (despite being too weak) of vertical and horizontal Chl distributions as compared to biogeochemical‐Argo profiling float and satellite observations. In addition, simulations with no other iron input than the boundary forcings reveal the relative importance of remote processes in modulating the seasonal pattern of Chl around the archipelago through horizontal advection of nutrient‐rich waters from the equator toward the archipelago and vertical mixing uplifting deep nutrient‐rich waters toward the upper lit layer. Key Points: Characterizing the biological enhancement observed in the Marquesas archipelago using a coupled physical biogeochemical ocean modelRevealing the importance of iron in the Marquesas island mass effect
- Subjects
MARQUESAS Islands (French Polynesia); WATER masses; PHYTOPLANKTON; BIOMASS; OCEANOGRAPHY
- Publication
Journal of Geophysical Research. Oceans, 2019, Vol 124, Issue 11, p7781
- ISSN
2169-9275
- Publication type
Article
- DOI
10.1029/2019JC015275