Introduction PSSdb Data
Pelagic Size Structure Database (PSSdb)
PSSdb v2023-05

This dataset represents the first release of the Pelagic Size Structure database (PSSdb) scientific project, investigating the global particle size distributions measured from multiple pelagic imaging systems. These devices include the Imaging Flow Cytobot (Olson and Sosik 2007), the ZooScan (Gorsky et al. 2010), and the Underwater Vision Profiler (Picheral et al. 2010). The data sources come from Ecotaxa (, Ecopart (, and Imaging FlowCytobot dashboards ( and

This initial dataset is composed of two products, separated by imaging device:
  • Product 1a includes the normalized biovolume (NB) of plankton and particles within a set of pre-defined size classes, averaged by year and month, and in 1-degree longitude/latitude grid cells.

  • Product 1b includes the results of normalized biovolume size spectra (NBSS) calculations, averaged by year and month, and in 1-degree longitude/latitude grid cells.

The v2023-05 data can be downloaded here:

Note that this is no longer the newest version of the PSSdb.
If you want the newest version, click on this link

- - -> Newest PSSdb Version (auto-link) < - - -

      Dugenne, M., Corrales-Ugalde, M., O'Brien, T., Lombard, F., Irisson, J., Stemmann, L., Stock, C., Kiko, R., & Luo, J.Y. 2023. A Pelagic Size Structure database (PSSdb) to support biogeochemical modeling: first release (v2023-05 : first release) [Data set]. Zenodo.

      Olson R. J. and Sosik H. M. 2007. A submersible imaging-in-flow instrument to analyze nano- and microplankton: Imaging FlowCytobot. Limnol. Oceanogr.: Methods 5, 2007, 195203

      Gorsky G., Ohman M. D., Picheral M., Gasparini S., Stemmann L., Romagnan B., Cawood A., Pesant S., Garcia-Comas C., Prejger F. 2010. Digital zooplankton image analysis using the ZooScan integrated system. J. Plankton Res.: 32, 2010, 285303

      Picheral M., Guidi L., Stemmann L., Karl D. M., Iddaoud G., Gorsky G. 2010. The Underwater Vision Profiler 5: An advanced instrument for high spatial resolution studies of particle size spectra and zooplankton. Limnol. Oceanogr.: Methods 8, 2010, 462473

    PSSdb is part of COPEPOD's data ecosystem.