Biogeochemical variables and optimum multiparameter analysis results from the tropical and subtropical Atlantic of the MAFIA cruise in 2015

• Main Authors: Gómez-Letona, Markel, Arístegui, Javier, Hernández-Hernández, Nauzet, Alvarez-Salgado, Xose Anton, Álvarez, Marta, Delgadillo, Erick, Pérez-Lorenzo, Maria, Teira, Eva, Hernández-León, Santiago, Sebastian, Marta
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Absorption coefficient; colored dissolved organic matter at 254 nm; Antarctic Intermediate Water of 3.1°C; relative volume contribution; Antarctic Intermediate Water of 5°C; Atlantic; Atlantic Ocean; bathypelagic; Biogeochemical impact of mesoscale and sub-mesoscale processes along the life history of cyclonic and anticyclonic eddies: plankton variability and productivity; Calculated; Calculated after Broecker (1974); Campaign; Chlorophyll a; integrated; Circumpolar Deep Water; Constraining organic carbon fluxes in an eastern boundary upwelling ecosystem (NW Africa): the role of non-sinking carbon in the context of the biological pump; Continuous Segmented Flow Analyzer; SEAL Analytical; QuAAtro39; CTD; Sea-Bird; SBE 911plus; CTD/Rosette; CTD-RO; dark ocean; Date/Time of event; DEPTH; water; Eastern North Atlantic Central Water of 12°C; Eastern North Atlantic Central Water of 15°C; e-IMPACT; Equatorial Water; Event label; Fluorescence intensity; maximum; DOM; fluorescent dissolved organic matter; FLUXES; Hespérides; Latitude of event; Longitude of event; Madeira Mode Water; MAFIA; MAFIA_01_D-1; Antarc*; Antarctic; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.942934; https://doi.org/10.1594/PANGAEA.942934

This dataset contains the results of the fluorescent dissolved organic matter characterisation (FDOM) and water mass optimum multiparameter analysis from the MAFIA cruise (Migrants and Active Flux In the Atlantic ocean). Samples were collected in the tropical and subtropical Atlantic during the MAFIA cruise (April 2015) on board the BIO Hespérides. Seawater samples for biogeochemical analyses were collected at 13 stations (from the Brazilian coast to the Canary Islands), from the surface down to 3500 m, using a General Oceanics oceanographic rosette equipped with 24 l PVC Niskin bottles. Oxygen solubility was computed using the equation of Benson and Krause (1984). AOU (µmol/kg) was calculated by subtracting measured oxygen concentration from the oxygen solubility values at saturation, with respect to the atmosphere. Fluorescence measurements were performed with a Perkin-Elmer LS55 spectrofluorometer and FDOM was characterised by means of a Parallel Factor analysis. Integrated values were estimated by multiplying the discrete measurements by the distance, in meters, between samples. The contribution of each water mass to each sample was objectively quantified applying an optimum multiparameter analysis (excluding mixed layer samples, here < 100 m). The aim of this dataset was to jointly characterise the FDOM and water mass distributions to infer the processes that shape the dissolved organic matter pool in the deep ocean (water mass mixing and history vs. local processes).