Dissolved Greenhouse Gases in the Surface Waters of Deception Island, Antarctica

[Description of methods used for collection/generation of data] The database provides discrete measurements of carbon system parameters and Greenhouse Gas levels in water samples collected at 277 stations during the campaign conducted in 2024. Geographic coordinates of sampling stations are provided. Some physical data (i.e. temperature and salinity) are also included. During the campaigns, temperatura and salinity were obtained with an EXO TM 2 multiparametric probe sonde. Surface seawater was subsequently collected for biogeochemical analysis. The biogeochemical variables shown in the database are pH in TOTAL scale (pH_T25), total alkalinity (AT), dissolved organic carbon (DOC), and the gases: dissolved oxygen (DO), dissolved nitrous oxide (N2O), dissolved methane (CH4) · pH_T25 data were obtained by XXXXXXXXXXXXXXXXXXXX. · Samples for AT analysis were collected in 500-ml borosilicate bottles, and poisoned with 100 μl of HgCl2-saturated aqueous solution and stored until measurement in the laboratory. AT was measured by potential titration according to Mintrop et al. (2000) with a Titroprocessor (model Metrothm 888). · Water samples for DOC and total dissolved nitrogen (TDN) determination were taken, filtered immediately (Whatman GF/F, 0.7 μm) and 100 μl of orthophosphoric acid (3:1) was added. Stored in fridge for later analyses in the laboratory. DOC and TDN concentrations were obtained by catalytic oxidation at high temperature (720°C) and chemiluminescence, respectively, applying the protocol described by Alvarez-Salgado & Miller, (1998). · DO were determined by potentiometric titration following Winkler (1888). · N2O and CH4 concentration was obtained by headspace equilibration method, and the concentration of dissolved gases was determined following Wilson et al. (2018).