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Inferring phytoplankton carbon and eco-physiological rates from diel cycles of spectral particulate beam-attenuation coefficient

G. Dall’Olmo,E. Boss,M. Behrenfeld,T. Westberry,C. Courties,L. Prieur,M. Pujo-Pay,N. Hardman-Mountford,T. Moutin

Published 2011 in Biogeosciences

ABSTRACT

The diurnal fluctuations in solar irradiance im- pose a fundamental frequency on ocean biogeochemistry. Observations of the ocean carbon cycle at these frequen- cies are rare, but could be considerably expanded by mea- suring and interpreting the inherent optical properties. A method is presented to analyze diel cycles in particulate beam-attenuation coefficient ( cp) measured at multiple wave- lengths. The method is based on fitting observations with a size-structured population model coupled to an optical model to infer the particle size distribution and physiologically rel- evant parameters of the cells responsible for the measured diel cycle in cp. Results show that the information related to size and contained in the spectral data can be exploited to independently estimate growth and loss rates during the day and night. In addition, the model can characterize the pop- ulation of particles affecting the diel variability in cp. Ap- plication of this method to spectral cp measured at a station in the oligotrophic Mediterranean Sea suggests that most of

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