Coastal regions exhibit a wide range of pH changes resulting from multiple factors with high spatiotemporal variability, hindering the detection of anthropogenically-driven ocean acidification signals. In this work, we evaluate the seasonal and long-term ocean acidification changes and their drivers in surface waters of two coastal time-series in the northwestern Mediterranean Sea: L'Estartit Oceanographic Station (EOS; 42.05N 3.2542E) and Blanes Bay Microbial Observatory (BBMO; 41.665N 2.805E). These two coastal time-series are located off the coast of Girona (Spain) ~60 km apart, being EOS farther from the coast than BBMO (~3.5 km and ~850 m, respectively), with the former being by a natural reserve and the latter outside a port area; therefore land-ocean interactions and anthropogenic activities should lead to higher variability at BBMO than at EOS. In these two time-series stations, measurements of total alkalinity (TA) and pH and associated variables, such as inorganic nutrients, temperature and salinity, have been performed monthly since 2010. We also assess the impact of distance to land and monitoring frequency on the detection of anthropogenically-driven ocean acidification signals in coastal time-series by comparing our results with those from the French coastal time-series station Point B (43.686N 7.316E; ~400 m from the coast of Villefranche-sur-Mer), also in the northwestern Mediterranean Sea and influenced by the same surface currents as EOS and BBMO, but where total dissolved inorganic carbon and TA are measured weekly.
Primary Presenter: Maribel García-Ibáñez, Institut de Ciències del Mar - CSIC (maribel.garcia.ibanez@gmail.com)
Authors:
Maribel I. García-Ibáñez, Institut de Ciències del Mar (ICM), CSIC, Barcelona 08003, Spain (maribelgarcia@icm.csic.es)
Elisa F. Guallart, Institut de Ciències del Mar (ICM), CSIC, Barcelona 08003, Spain ()
Arturo Lucas, Institut de Ciència i Tecnologia Ambientals (ICTA), Universitat Autònoma de Barcelona (UAB), Bellaterra 08193, Spain ()
Josep Pascual, Estació Meteorològica de L'Estartit, Girona, Spain ()
Josep M. Gasol, Institut de Ciències del Mar (ICM), CSIC, Barcelona 08003, Spain ()
Cèlia Marrasé, Institut de Ciències del Mar (ICM), CSIC, Barcelona 08003, Spain ()
Eva Calvo, Institut de Ciències del Mar (ICM), CSIC, Barcelona 08003, Spain ()
Carles Pelejero, Institut de Ciències del Mar (ICM), CSIC, Barcelona 08003, Spain. Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys 23, Barcelona 08010, Spain ()
Coastal ocean acidification variability in the Northwestern Mediterranean Sea
Category
Scientific Sessions > SS050 Disentangling Complex Long-Term pH and O2 Trends in Coastal and Estuarine Systems From Global and Regional Drivers
Description
Time: 06:30 PM
Date: 7/6/2023
Room: Mezzanine