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González-Dávila, Melchor; Santana-Casiano, Juana Magdalena; Curbelo-Hernández, David (2023): Surface underway pH and thermosalinograph measurements in the Macaronesia region during POS533 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.956520

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Abstract:
Surface underway physicochemical measurements were performed in open-ocean and archipelagic coastal waters of the Macaronesia region during the POS533 cruise (from February 28 to March 19, 2019) on board the RV Poseidon. The Macaronesia region show a high variability due to its location in a coupling area between the Canary Upwelling System along the Northwest African coast and the oligotrophic open-ocean waters of the Northeast Atlantic subtropical gyre and the influence of the island interaction with the Canary Current. Thus is a key zone in terms of CO2 distribution, natural and anthropogenic carbon inventory and air-sea exchange and requires the develop of regional-scale field studies. The autonomous monitoring was carried out through the vessel track mainly downwind in the archipelagos of Cape Verde, Canary and Madeira and through the latitudinal transects that connect them. The obtained dataset includes sea surface temperature (SST), salinity (SSS) and pH values with a temporal frequency of data collection of 5 minutes. The SST and SSS were monitored by using a SeaCat SBE21 termosalinograph placed at the same location of the seawater immersed pump (main seawater intake of the RV Poseidon) with an accuracy of 0.01 ºC and 0.001, respectively. A spectrophotometric pH sensor (SP101-SM) developed by the QUIMA group (IOCAG-ULPGC) and SensorLab (González-Dávila et al., 2014; 2016) and based on the method described by Clayton and Byrne (1993) was run in continuous and used for the surface pH monitoring. The SP101-SM pH sensor uses 4 wavelengths analysis for the m-cresol purple, includes auto-cleaning steps, performs a blank for pH calculation immediately after the dye injection and removes any dye effect in each pH reading (the accuracy with respect to a TRIS seawater buffer was ±0.002 units). These in-situ collected data improve the knowledge about the biogeochemistry in eastern boundary transitional areas and allows a better understanding of the role in the climate change of archipelagic waters, coastal regions and island/continental shelves. The provided datasets can be used in further biogeochemical studies in the Macaronesia region and in the entire Northeast Atlantic. The monitoring and data collection received fundings from the Atmosphere-Ocean-Islands-Biogeochemical interactions in the Macaronesian Archipelagos of Cabo Verde, the Canaries and Madeira project (AIMAC project) and the European Union's Horizon 2020 research and innovation program under grant agreement Nº 820989 (COMFORT project). In this case, the measurements complemented those done for iron study (Santana-Casiano and Quack, 2021).
Keyword(s):
CO2 system; Macaronesia region; pH
Supplement to:
Curbelo-Hernández, David; González-Dávila, Melchor; Santana-Casiano, Juana Magdalena (2023): The carbonate system and air-sea CO2 fluxes in coastal and open-ocean waters of the Macaronesia. Frontiers in Marine Science, 10, 1094250, https://doi.org/10.3389/fmars.2023.1094250
Related to:
Arnone, Veronica; González-Santana, David; González-Dávila, Melchor; González, Aridane G; Santana-Casiano, Juana Magdalena (2022): Iron and copper complexation in Macaronesian coastal waters. Marine Chemistry, 240, 104087, https://doi.org/10.1016/j.marchem.2022.104087
González-Dávila, Melchor; Santana-Casiano, Juana Magdalena; Curbelo-Hernández, David (2023): Surface-to-bottom total alkalinity, inorganic carbon and CTD data in coastal areas leeward of the Macaronesia archipelagos during POS533 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.956272
Santana-Casiano, Juana Magdalena; Quack, Birgit (2021): Metal (Iron and Copper) complexation from water samples during POSEIDON cruise POS533 (AIMAC) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.933690
References:
Clayton, Tonya D; Byrne, R H (1993): Spectrophotometric seawater pH measurements: total hydrogen ion concentration scale calibration of m-cresol purple and at-sea results. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 2115-2129, https://doi.org/10.1016/0967-0637(93)90048-8
González-Dávila, Melchor; Santana-Casiano, Juana Magdalena; Petihakis, George; Ntoumas, Manolis; Suárez de Tangil, Miguel; Krasakopoulou, Evangelia (2016): Seasonal pH variability in the Saronikos Gulf: A year-study using a new photometric pH sensor. Journal of Marine Systems, 162, 37-46, https://doi.org/10.1016/j.jmarsys.2016.03.007
González-Dávila, Melchor; Santana-Casiano, Juana Magdalena; Prêcheur-Massieu, Hervé (2014): New pH sensor for monitoring ocean acidifcation. Sea Technology, 55, 37–40, https://hdl.handle.net/10553/49797
Funding:
Horizon 2020 (H2020), grant/award no. 820989: Our common future ocean in the Earth system – quantifying coupled cycles of carbon, oxygen, and nutrients for determining and achieving safe operating spaces with respect to tipping points (COMFORT)
Coverage:
Median Latitude: 23.433513 * Median Longitude: -19.902492 * South-bound Latitude: 14.682113 * West-bound Longitude: -25.379505 * North-bound Latitude: 32.813212 * East-bound Longitude: -15.320518
Date/Time Start: 2019-02-28T10:18:00 * Date/Time End: 2019-03-19T13:07:00
Minimum DEPTH, water: m * Maximum DEPTH, water: m
Event(s):
POS533_0_Underway-1 * Latitude Start: 16.887600 * Longitude Start: -25.003748 * Latitude End: 32.642528 * Longitude End: -16.911842 * Date/Time Start: 2019-02-28T10:18:00 * Date/Time End: 2019-03-19T13:07:00 * Campaign: POS533/1 (AIMAC) * Basis: Poseidon * Method/Device: Thermosalinograph (TSG) * Comment: event was not logged in DSHIP
POS533_0_Underway-2 * Latitude Start: 16.887600 * Longitude Start: -25.003748 * Latitude End: 32.642528 * Longitude End: -16.911842 * Date/Time Start: 2019-02-28T10:18:00 * Date/Time End: 2019-03-19T13:07:00 * Campaign: POS533/1 (AIMAC) * Basis: Poseidon * Method/Device: Spectrophotometer (SPEC) * Comment: event was not logged in DSHIP
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
16925 data points

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