VARYING DIEL TRENDS IN NEARSHORE OCEAN ACIDIFICATION
Jesse Lafian1, Francisco Chavez2.
1California State University Monterey Bay, Seaside, CA, 2Monterey Bay Aquarium Research Institute, Moss Landing, CA.
The purpose of this study was to offer an explanation for varying nearshore, diel-pH trends. The following questions were addressed: what is the description of diel-pH signals along a cross-shore transect in Monterey Bay, CA, and are these signals concomitant with ocean mixing and/or photosynthetic variables? Based on 2 weeks of data from the summer of 2014, nearshore ocean acidification patterns in conjunction with current, tide, wind, upwelling, chlorophyll, nutrient, and solar intensity data are described. Small moorings with surface and bottom pH sensors were deployed from the intertidal to 20 m depth. The intertidal and relatively offshore (∼0.5 km) surface pH signals associated more closely with photosynthetic (sunlight availability, nutrient, and chlorophyll) and ocean mixing (current, tide, wind, and upwelling) variables, respectively. We also observed that pH decreased with depth. How pH at depth changes with distance from shore is described. The results prompt further inquiry into nearshore pH variability and lead to a better understanding of nearshore ocean acidification, which endangers organisms’ survivorship regionally and globally.