Combination of ORP and pH sensors in tow-yo studies to map redox and acid-base anomalies in seawater due to hydrothermal activity in shallow areas

J. Magdalena Santana-Casiano1, Melchor González-Dávila1, Eugenio Fraile-Nuez2, Carolina Santana-González1, Edward T Baker3, Joseph A Resing3 and Sharon L Walker4, (1)IOCAG. Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain, (2)Spanish Institute of Oceanography, Santa Cruz de Tenerife, Spain, (3)Joint Institute for the Study of the Atmosphere and Ocean, Seattle, WA, United States, (4)NOAA Seattle, Seattle, WA, United States