An absorption-based approach to improved estimates of phytoplankton biomass and net primary production

[摘要] The abundance and productivity of phytoplankton constrain energy transfer through marine food webs and the export of organic carbon to the deep ocean. Bio-optical measurements correlate well with phytoplankton carbon (C phyto ), but the effect of taxonomic variability on this relationship is still uncertain. Here, we explore how changes in phytoplankton community composition influence the relationship between the particulate backscatter coefficient ( b bp ) and C phyto and present a new approach to estimate phytoplankton biomass more accurately using b bp . We found that using a fixed scaling factor for the conversion of b bp to C phyto could lead to the underestimation or overestimation of biomass, depending on the dominant taxonomic group in the phytoplankton community. In addition, we demonstrate how a simple ratio of absorption at two wavelengths can be used to provide a coarse approximation of phytoplankton community composition when scaling b bp to C phyto, thereby improving the estimation of net primary production.

[学科分类] 口腔科学