Carbon Dioxide and Hydrographic Data Obtained During the R/V Hesperides Cruise in the South Atlantic Ocean on CLIVAR Repeat Hydrography Section A21 (8 February - 10 March, 2010)

• Main Authors: Pérez, Fiz F., Ríos, Aida F., Velo, A., Castaño, Mónica, Movilla, J., Hernández Guerra, Alonso, Escánez, José, Domínguez-Yanes, J.F.
• Other Authors: European Commission, Ministerio de Ciencia e Innovación (España)
• Format: Dataset
• Language: English
• Published: 2010
• Subjects: Carbonic system; pH; Alkalinity; North Atlantic; A21; Repeat section; Clayton; South Atlantic Ocean
• Online Access: http://hdl.handle.net/10261/125280; https://doi.org/10.3334/CDIAC/OTG.CLIVAR_A21_29HE20100208; https://doi.org/10.13039/501100000780; https://doi.org/10.13039/501100004837

The item is made of 2 files, of which 1 is the dataset and the other include a small description of the measured variables.-- Dataset contributed to the Project Carbochange This dataset gathers discrete measurements of CO2 (pH and alkalinity) and hydrographic variables (salinity, temperature, dissolved oxygen, nitrate, phosphate and silicate) obtained during the cruise MOC2Austral carried out from 8 February to 10 March 2010. pH was measured spectrophotometrically following the Clayton and Byrne (1993). This method consists on adding a dye solution to the seawater sample, so that the ratio between two absorbances at two different wavelengths is proportional to the sample pH. Alkalinity was measured using an automatic potentiometric titrator Titrando 809 Metrohm, with a Metrohm 6.0232.100 combination glass electrode and a Pt-1000 probe for temperature measurement following the methodology given by Pérez and Fraga (1987). Dissolved oxygen was analyzed following the widely applied Winkler method. Determinations of nitrate, phosphate and silicate were carried out following methods described by Hansen and Grassoff (1983) Salinity and Temperature were recorded with a CTD probe Spanish Projects GHG4MOC (CTM2009-07574-E) and MOC2 (CTM2008-06438-C02-02/MAR) supported by Ministerio de Ciencia e Innovación, and CARBOCHANGE (264879) No