MESO-SCOPE - KM1709 - LISST Profiles

These Simons Collaboration on Ocean Processes and Ecology (SCOPE) data products were produced by the University of Hawaiʻi at Mānoa with support from the Simons Foundation. The MESO-SCOPE (Microbial Ecology of the Surface Ocean - Simons Collaboration on Ocean Processes and Ecology) expedition collected oceanographic observations in the region north of the Hawaiian Islands with the aim of identifying the impact of mesoscale eddies on the ecosystem of the North Pacific Subtropical Gyre. The expedition targeted a mesoscale dipole north of the island of Oahu to characterize: 1) the horizontal variability in biogeochemical and ecological properties across the two eddies; and 2) Lagrangian temporal dynamics at the two eddy centers, with a particular focus on diel processes. All LISST data were collected with a LISST-100X Type-B instrument operated in profiling mode. The angular range (median of bin) of the LISST Type-B is 0.106-17.96 degrees, and the size classes sensed are 1.44 - 231 microns (median of each size bin), albeit only particles less than 100 µm are considered here. All data have been corrected for background scattering of a clean filtered water calibration. The summed volume concentration of particles (in µL/L), the standard LISST output, is presented for 3 size ranges: 1.25-2 µm, 2-20 µm, and 20-100 µm. Particle volume concentration is then converted to particle concentration (#/L) by assuming spherical particles for particles with a diameter between 1.25 and 100 µm. Larger size classes are excluded due to low detection limits. Note that data have not been processed to remove outliers. The data have been binned to depth at 2m increments, and the latitude/longitude is generalized to the cast's time stamp and may not match the ship's position exactly. The timestamp is in UTC.