In-situ particle size distribution, volume concentration, and other measurements collected from profiled LISST-200X sensor throughout the Bedford Basin during the Halifax Joint Learning Opportunity from 2024-09-25 to 2025-03-11 (NCEI Accession 0304370)

This dataset contains time-series profiled measurements from a LISST-200X sensor (Sequoia Scientific, Inc.) collected during an ocean alkalinity enhancement (OAE) field trial conducted by Planetary Technologies in collaboration with Dalhousie University in Halifax, Nova Scotia, Canada. This dataset was collected under a Joint Learning Opportunity (JLO) funded by Carbon to Sea and COVE.

The sensor was deployed to provide direct, in-situ measurements of particles and particle properties (e.g., size, concentration) to (1) address open questions related to alkaline feedstock transport and fate, as well as environmental impacts from alkalinity dosing (e.g., secondary precipitation), and (2) support the refinement and validation of models used to predict alkaline feedstock transport and dissolution kinetics.

The LISST-200X was profiled at different locations and times throughout the Bedford Basin and surrounding waters from September 2024 to March 2025, both in and out of the mixing zone where alkalinity was being dosed. Profiling was performed during the approximately biweekly boat surveys conducted throughout the trial. The sensor measured particle size distribution, mean particle diameter, volume concentration, beam attenuation, and other variables. Additional information about the sensor deployment, profile locations, measurement parameters, data format, and processing can be found in the included supplemental document.