Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 5 2009 10.5194/bg-6-779-2009 http://www.biogeosciences.net/6/779/2009/ http://www.biogeosciences.net/6/779/2009/bg-6-779-2009.html http://www.biogeosciences.net/6/779/2009/bg-6-779-2009.pdf 779 794 2009-05-08 Satellite-detected fluorescence reveals global physiology of ocean phytoplankton M. J. Behrenfeld T. K. Westberry E. S. Boss R. T. O'Malley D. A. Siegel J. D. Wiggert B. A. Franz C. R. McClain G. C. Feldman S. C. Doney J. K. Moore G. Dall'Olmo A. J. Milligan I. Lima N. Mahowald Dept. of Botany and Plant Pathology, Cordley Hall 2082, Oregon State University, Corvallis, OR 97331-2902, USA School of Marine Sciences, 5706 Aubert Hall, University of Maine, Orono, Maine 04469-5741, USA Institute for Computational Earth System Science and Department of Geography, University of California,<br> Santa Barbara, CA 93106-3060, USA Dept. of Marine Sciences, University of Southern Mississippi, 1020 Balch Blvd., Stennis Space Center, <br> MS 39529-9904, USA NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA Dept. of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution Woods Hole, MA 02543-1543 Dept. of Earth System Science, 3214 Croul Hall, University of California, Irvine, CA 92697-3100, USA Cornell University, 2140 Snee Hall, Ithaca, NY, USA, 14850, USA Phytoplankton photosynthesis links global ocean biology and climate-driven fluctuations in the physical environment. These interactions are largely expressed through changes in phytoplankton physiology, but physiological status has proven extremely challenging to characterize globally. Phytoplankton fluorescence does provide a rich source of physiological information long exploited in laboratory and field studies, and is now observed from space. Here we evaluate the physiological underpinnings of global variations in satellite-based phytoplankton chlorophyll fluorescence. The three dominant factors influencing fluorescence distributions are chlorophyll concentration, pigment packaging effects on light absorption, and light-dependent energy-quenching processes. After accounting for these three factors, resultant global distributions of quenching-corrected fluorescence quantum yields reveal a striking consistency with anticipated patterns of iron availability. 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