Articles | Volume 17, issue 3
https://doi.org/10.5194/bg-17-793-2020
https://doi.org/10.5194/bg-17-793-2020
Research article
 | 
17 Feb 2020
Research article |  | 17 Feb 2020

Diel quenching of Southern Ocean phytoplankton fluorescence is related to iron limitation

Christina Schallenberg, Robert F. Strzepek, Nina Schuback, Lesley A. Clementson, Philip W. Boyd, and Thomas W. Trull

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Short summary
Measurements of phytoplankton health still require the use of research vessels and are thus costly and sparse. In this paper we propose a new way to assess the health of phytoplankton using simple fluorescence measurements, which can be made autonomously. In the Southern Ocean, where the most limiting nutrient for phytoplankton is iron, we found a relationship between iron limitation and the depression of fluorescence under high light, the so-called non-photochemical quenching of fluorescence.
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