FIRe glider: Mapping in situ chlorophyll variable fluorescence with autonomous underwater gliders

Filipa Carvalho, Maxim Y. Gorbunov, Matthew J. Oliver, Christina Haskins, David Aragon, Josh T. Kohut, Oscar Schofield

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Nutrient and light availability regulate phytoplankton physiology and photosynthesis in the ocean. These physiological processes are difficult to sample in time and space over physiologically and ecologically relevant scales using traditional shipboard techniques. Gliders are changing the nature of data collection, by allowing a sustained presence at sea over regional scales, collecting data at resolution not possible using traditional techniques. The integration of a fluorescence induction and relaxation (FIRe) sensor in a Slocum glider allows autonomous high-resolution and vertically-resolved measurements of photosynthetic physiological variables together with oceanographic data. In situ measurements of variable fluorescence under ambient light allows a better understanding of the physical controls of primary production (PP). We demonstrate this capability in a laboratory setting and with several glider deployments in the Southern Ocean. Development of these approaches will allow for the in situ evaluation of phytoplankton light stress and photoacclimation mechanisms, as well as the role of vertical mixing in phytoplankton dynamics and the underlying physiology, especially in remote locations and for prolonged duration.

Original languageEnglish (US)
Pages (from-to)531-545
Number of pages15
JournalLimnology and Oceanography: Methods
Issue number9
StatePublished - Sep 1 2020

All Science Journal Classification (ASJC) codes

  • Ocean Engineering


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