sensors Article High Resolution pH Measurements Using a Lab-on-Chip Sensor in Surface Waters of Northwest European Shelf Seas Victoire M. C. Rérolle 1, Eric P. Achterberg 1,2,* ID , Mariana Ribas-Ribas 1,3 ID , Vassilis Kitidis 4 ID , Ian Brown 4, Dorothee C. E. Bakker 5, Gareth A. Lee 5 and Matthew C. Mowlem 6 1 National Oceanography Centre, Southampton, University of Southampton, Southampton SO14 3ZH, UK; v.rerolle@fluidion.com (V.M.C.R.);
[email protected] (M.R.-R.); 2 GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany 3 Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, 26382 Wilhelmshaven, Germany 4 Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK;
[email protected] (V.K.);
[email protected] (I.B.) 5 Centre of Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK;
[email protected] (D.C.E.B.);
[email protected] (G.A.L.) 6 National Oceanography Centre, Southampton SO14 3ZH, UK;
[email protected] * Correspondence:
[email protected] Received: 2 July 2018; Accepted: 4 August 2018; Published: 10 August 2018 Abstract: Increasing atmospheric CO2 concentrations are resulting in a reduction in seawater pH, with potential detrimental consequences for marine organisms. Improved efforts are required to monitor the anthropogenically driven pH decrease in the context of natural pH variations. We present here a high resolution surface water pH data set obtained in summer 2011 in North West European Shelf Seas.