Underway surface seawater high-resolution pH time series for R/V Sonne cruise SO279. Version 4

This dataset contains a high-resolution (1 measurement every 30 seconds) time series of surface ocean pH in the Azores Region (North Atlantic Ocean) measured with a PyroScience fiber-based pH sensor (PHROBSC-PK8T) and cross-calibrated using discrete carbonate system observations (total alkalinity, dissolved inorganic carbon and nutrients). The measurements were collected during R/V Sonne cruise SO279 in Dec 2020, as part of the NAPTRAM research programme to build an understanding of the transport pathways of plastic and microplastic debris in the North Atlantic. Bad results from technical issues during analysis have been removed from these results, so there are no recognised issues. The data were collected as part of an international effort from the JPI Oceans project HOTMIC and BMBF project PLASTISEA , and forms a joint effort of HOTMIC and PLASTISEA researchers from a range of countries and institutes. The NIOZ created the metadata entry and is responsible for holding master copies of the data.