Underway surface seawater high-resolution pH time series for R/V Sonne cruise SO289. Version 4

This dataset contains a high-resolution (1 measurement every 30 seconds) time series of surface ocean pH in the South Pacific Ocean measured with a PyroScience fiber-based pH sensor (PHROBSC-PK8T) and cross-calibrated using discrete carbonate system observations (total alkalinity and dissolved inorganic carbon). The measurements were collected during R/V Sonne cruise SO289 in February-April 2022,as part of the GEOTRACES GP21 research programme to build an understanding of the distribution, origins, and depletions of trace elements and their isotopes (TEIs) in a lesser-explored ocean region. Bad results from technical issues during analysis have been removed from these results, so there are no recognised issues. The NIOZ created the metadata entry and is responsible for holding master copies of the data.