MESO-SCOPE - KM1709 - Optics - LISST, C-STAR, ECO

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. Three biooptical instruments were plumbed to the underway uncontaminated seawater on the R/V Kilo Moana. Data for each instrument were averaged to the hour and matched to a timestamp every hour. LISST: Filtered values (<0.2 um) removed from all data. The summed volume concentration of particles (in uL/L) are converted to carbon concentrations (umol C /L) using Mender-Deuer and Lessard (2000) conversion factor and is presented for 3 size ranges: 1.35-2 µm, 2-20 µm, and 20-100 µm. Particle volume concentration can be converted to particle concentration by assuming spherical particles. The total particle concentration (#/L) is calculated for particles with a diameter between 1.35 and 100 um. Larger size classes are excluded due to low detection limits. Note that data have not been processed to remove outliers. C-star: Filtered values (<0.2 um) removed from all data. ECO: filtered values (<0.2 um) removed from chl and volume scattering data; chl fluorescence converted to mg/m3 using factory calibrations. The volume scattering is converted to particle backscattering coefficient following Boss and Pegau (2001). The timestamp is in UTC.