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| Titel |
Inferring phytoplankton carbon and eco-physiological rates from diel cycles of spectral particulate beam-attenuation coefficient |
| VerfasserIn |
G. Dall'Olmo, E. Boss, M. J. Behrenfeld, T. K. Westberry, C. Courties, L. Prieur, M. Pujo-Pay, N. Hardman-Mountford, T. Moutin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 11 ; Nr. 8, no. 11 (2011-11-28), S.3423-3439 |
| Datensatznummer |
250006209
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| Publikation (Nr.) |
 copernicus.org/bg-8-3423-2011.pdf |
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| Zusammenfassung |
| The diurnal fluctuations in solar irradiance impose a fundamental frequency
on ocean biogeochemistry. Observations of the ocean carbon cycle at these
frequencies are rare, but could be considerably expanded by measuring and
interpreting the inherent optical properties. A method is presented to
analyze diel cycles in particulate beam-attenuation coefficient (cp)
measured at multiple wavelengths. 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 relevant 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 population of particles
affecting the diel variability in cp. Application of this method to
spectral cp measured at a station in the oligotrophic Mediterranean
Sea suggests that most of the observed variations in cp can be
ascribed to a synchronized population of cells with an equivalent spherical
diameter around 4.6±1.5 μm. The inferred carbon biomass of these
cells was about 5.2–6.0 mg m−3 and accounted for approximately 10% of
the total particulate organic carbon. If successfully validated, this method
may improve our in situ estimates of primary productivity. |
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