Journal
SCIENCE
Volume 351, Issue 6270, Pages 264-267Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aab2213
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Funding
- NASA Ocean Biology and Biogeochemistry Program [NNX08AC24G]
- Strategic Environmental Research and Development Program [SI-1334]
- Institute of Marine and Coastal Sciences
- Bennett L. Smith Endowment
- Russian Science Foundation [14-17-00451]
- Korea Polar Research Institute [PP15020]
- NASA [103237, NNX08AC24G] Funding Source: Federal RePORTER
- Korea Institute of Marine Science & Technology Promotion (KIMST) [PP15020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Russian Science Foundation [14-17-00451] Funding Source: Russian Science Foundation
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Solar radiation absorbed by marine phytoplankton can follow three possible paths. By simultaneously measuring the quantum yields of photochemistry and chlorophyll fluorescence in situ, we calculate that, on average, similar to 60% of absorbed photons are converted to heat, only 35% are directed toward photochemical water splitting, and the rest are reemitted as fluorescence. The spatial pattern of fluorescence yields and lifetimes strongly suggests that photochemical energy conversion is physiologically limited by nutrients. Comparison of in situ fluorescence lifetimes with satellite retrievals of solar-induced fluorescence yields suggests that the mean values of the latter are generally representative of the photophysiological state of phytoplankton; however, the signal-to-noise ratio is unacceptably low in extremely oligotrophic regions, which constitute 30% of the open ocean.
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