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Instrumented elephant seals reveal the seasonality in chlorophyll and light-mixing regime in the iron-fertilized Southern Ocean

Abstract : We analyze an original large data set of concurrent in situ measurements of fluorescence, temperature and salinity provided by sensors mounted on the elephant seals of Kerguelen Island. Our results were mainly gathered in regions of the Southern Ocean where the typical iron limitation is relieved by natural iron fertilization. Thus the role of light as the proximal factor of control of phytoplankton can be examined. We show that self-shading, and consequently stratification, are major factors controlling the integrated biomass during the bloom induced by iron fertilization. When the mixed layer was the shallowest, the maximum ChlMLachievable by the given light-mixing regime was however not reached, most likely due to silicic acid limitation. We also show that a favorable light-mixing regime prevails after the spring equinox and is maintained for roughly seven months (October-April). Citation: Blain, S., S. Renaut, X. Xing, H. Claustre, and C. Guinet (2013), Instrumented elephant seals reveal the seasonality in chlorophyll and light-mixing regime in the ironfertilized Southern Ocean.
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Submitted on : Thursday, March 20, 2014 - 11:10:04 AM
Last modification on : Monday, August 31, 2020 - 5:04:02 PM

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Stéphane Blain, Sophie Renaut, Xiaogang Xing, Hervé Claustre, Christophe Guinet. Instrumented elephant seals reveal the seasonality in chlorophyll and light-mixing regime in the iron-fertilized Southern Ocean. Geophysical Research Letters, American Geophysical Union, 2013, 40, pp.6368-6372. ⟨10.1002/2013GL058065⟩. ⟨hal-00961531⟩

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