POSTER Session 1

Examining optical methods for particle size metrics in contrasting oceanic environments

Particle size distribution is an important factor influencing many processes in the ocean, from optical properties to energy transfer and carbon export. As such, it can be considered an essential ocean variable despite challenges in obtaining measurements over broad size ranges. Optical methods exist to examine particle size distributions based on time-series measurements of backscattering and near-forward scattering, yet intercomparison of methods in natural oceanic environments is somewhat rare. Furthermore, when new instruments are brought to market, comprehensive testing and evaluation is valuable. In the current study, we examine the recently developed Tridente (RBR Global) to estimate the particulate backscattering coefficient and particle size metrics in contrasting oceanic environments. Specifically, we will compare particle size metrics based on spike and variance-to-mean ratio methods in comparison with the forward-scattering inversion approach employed by the LISST-200X (Sequoia Scientific). Additional evaluations are intended for the particulate backscattering coefficient in comparison with the LISST-VSF (Sequoia Scientific) and Mie scattering theory. Our testing plan includes laboratory measurements with polystyrene bead standards in addition to field testing during two research cruises in the Greenland Sea and fjords near Bergen, Norway. We will present findings relevant to instrument performance and data processing methods in support of the reliable use of the Tridente for studies of ocean biogeochemistry.

*Ole Andrè Høydal, University of Bergen, Norway

Daniel Koestner, University of Bergen, Norway

Hongbo Liu, University of Bergen, Norway

Nathan Briggs, National Oceanography Centre, United Kingdom

Code of Conduct
Privacy Policy