Publication Date:
2024-02-27
Description:
In Summer 2015 (4-31 August), CNR-ISMAR carried out an oceanographic field-study in the Western Mediterranean Sea, on board of R/V MINERVA UNO. Sampling stations consisted in 7 transects, that spanned from Sicily Channel to Ligurian sea, Catalan sea, and Balearic Basin, dividing the area in sub-basins. 92 stations were visited totally. The dataset includes 550 discrete data of carbonate chemistry (pH-total scale and Total Alkalinity), concentrations of dissolved oxygen, and basic hydrological data (temperature, salinity and density).
Methods:
At each station, pressure (dbar), temperature (°C), and conductivity(mS/cm) were measured with a CTD SBE 911 plus General Oceanics Rosette System, equipped with 24 12-litres Niskin Bottles. Salinity (S, psu) and depth (m) were calculated by Sea-Bird Scientific routines. Seawater samples (n = 550) for the determination of biogeochemical parameters were collected from the Niskin bottles. Samples for dissolved oxygen (DO) were drawn in 60-mL BOD bottles and treated with Winkler reagents immediately after collection. For the determination of pH on the total hydrogen ion scale at 25 °C (pHT25), the samples were drawn after DO samples into 10 cm long cylindrical glass cells and analyzed spectrophotometrically. For the determination of total alkalinity (TA; μmol kg-1), the samples were collected in 300 ml borosilicate bottles, poisoned with mercuric chloride, tightly closed and stored in the dark at a temperature similar to the in situ one (4-25 °C). DO samples were analyzed by the Winkler method (Grasshoff et al., 1999) using an automated Metrohm 798 MPT Titrino potentiometric titration system (CV = 0.17 % at 210 µmol L-1). pHT25 was measured on board, within 24 h after the sampling, using the spectrophotometric method with m-cresol purple as indicator (Clayton and Byrne, 1993). The precision was ±0.002 units (n = 3), accuracy and stability of the method were checked daily with reference seawater certified for TA and TCO2 (n = 34, CRM batch 146 provided by Prof A. G. Dickson, Scripps, 210 California). TA was determined by potentiometric titration in an open cell with a difference derivative readout (Hernandez-Ayon et al., 1999). The average precision was ±2.0 μmol kg-1 (n = 86 duplicate samples) and the accuracy was checked daily by the titration of certified reference seawater (n = 59, CRM batch 146)
Keywords:
108; 109; 110; 111; 213; 215; 217; 218; 219; 225; 227; 231; 261; 291; 405; 406; 433; 434; 438; 451; 460; 462; 51; 900; 901; 903; 906; 907; 908; 910; 911; 912; 913; Alkalinity, total; B1; B2; B3; B4; B5; B6; B7; B8; Balearic Basin; CORS-MOOR; CTD, Sea-Bird SBE 911plus; CTD/Rosette; CTD-RO; D1; D2; D3; D5; D7; DATE/TIME; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; M9; MINERVA UNO; OC2015; OC2015_108; OC2015_109; OC2015_110; OC2015_111; OC2015_213; OC2015_215; OC2015_217; OC2015_218; OC2015_219; OC2015_225; OC2015_227; OC2015_231; OC2015_261; OC2015_291; OC2015_405; OC2015_406; OC2015_433; OC2015_434; OC2015_438; OC2015_451; OC2015_460; OC2015_462; OC2015_51; OC2015_900; OC2015_901; OC2015_903; OC2015_906; OC2015_907; OC2015_908; OC2015_910; OC2015_911; OC2015_912; OC2015_913; OC2015_B1; OC2015_B2; OC2015_B3; OC2015_B4; OC2015_B5; OC2015_B6; OC2015_B7; OC2015_B8; OC2015_CORS-MOOR; OC2015_D1; OC2015_D2; OC2015_D3; OC2015_D5; OC2015_D7; OC2015_M9; OC2015_S10; OC2015_S12; OC2015_S14; OC2015_S16; OC2015_S18; OC2015_S19; OC2015_S2; OC2015_S20; OC2015_S4; OC2015_S6; OC2015_S8; Ocean acidification; OCEAN-CERTAIN; Ocean Food-web Patrol – Climate Effects: Reducing Targeted Uncertainties with an Interactive Network; Oxygen; pH; Pressure, water; S10; S12; S14; S16; S18; S19; S2; S20; S4; S6; S8; Salinity; Sicily Channel; Spectrophotometry; Temperature, water; Titration, Winkler; Titration potentiometric; Total alkalinity; Western Mediterranean; Winkler oxygen
Type:
Dataset
Format:
text/tab-separated-values, 2921 data points
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