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log in [FoSI-characteristics-LODP-HODP-DESAFÍO] - Particle characteristics for low and high optical-density particles (LODP and HODP) from Focused Shadowgraph Imaging (FoSI) in the NE Atlantic, Jan-Mar 2023 (DESAFÍO) (Linking optical characteristics of small particles (50 - 500 micrometer) with their sinking velocities in the mesopelagic environment) This dataset comprises particle morphological measurements (for particles 200-1000 micrometer) collected during the DESAFÍO expedition (31 January–2 March 2023) in the northeastern subtropical Atlantic Ocean, spanning 22 CTD casts across the Azores, the Canary Islands, and the intervening open ocean. Particles imaged in situ were classified into two optical density–based pools, a low-optical-density particle (LODP) pool representing gel-like and other translucent particles, and a high-optical-density particle (HODP) pool representing more opaque particles, with morphological attributes including equivalent spherical diameter (ESD), optical density, aspect ratio and circularity recorded for each. Measurements were compiled across three geographic regions (CI, OO and AZ) and three depth strata (epipelagic, mesopelagic, and bathypelagic), allowing characterization of particle shape and composition across spatial and depth gradients in the study region (see listed Results Publications).\n\ncdm_data_type = Other\nVARIABLES:\nparticlePool (unitless)\ndepth_zone (unitless)\nregions (unitless)\nESD (micrometers)\naspect_ratio (unitless)\nOD (unitless)\ncircularity (unitless)\n BCO-DMO bcodmo_dataset_1003429_v1
log in [FoSI-spectra-DESAFIO] - Particle number spectra of low and high-optical-density particles (LODP and HODP) from Focused Shadowgraph Imaging (FoSI) in the NE Atlantic, Jan-Mar 2023 (DESAFÍO) (Linking optical characteristics of small particles (50 - 500 micrometer) with their sinking velocities in the mesopelagic environment) This dataset presents particle number spectra from the DESAFÍO expedition (PID2020-118118RB-100), collected in the northeastern subtropical Atlantic between the Azores and Canary Islands (31 Jan–2 Mar 2023). Particle images were acquired with a Focused Shadowgraph Imaging (FoSI) System (11.75 μm/pixel) mounted on a CTD/rosette across 22 casts, spanning three regions and three depth strata (epipelagic, mesopelagic, bathypelagic). Particles ≥23.5 μm were classified by optical density into low-OD (gel proxy) and high-OD pools, sorted into size classes, and normalized to compute particle number spectra. Spectral slopes were compared across regions and depths using ANCOVA to assess spatial variability in particle size distributions (see listed Results Publications).\n\ncdm_data_type = Other\nVARIABLES:\nparticlePool (unitless)\ndepth_zone (unitless)\nlog10_size_bin (log10(cm))\nlog10_spectrum (log10(cm^-4))\n BCO-DMO bcodmo_dataset_1003458_v1

 
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