Abstract
In the North Pacific, variations in isopycnal depth influence the biogeochemical characteristics of the water column and the aragonite saturation horizon (ZΩa) during interannual events. The objective of this study was to assess the effect of the 2011 La Niña conditions on ZΩa in Todos Santos Bay (Baja California, Mexico) and surrounding waters. The results showed that ZΩa variability was modulated by the intensity of interannual conditions and by the water masses that were present in the region. Subarctic Water predominated in the upper 200 m with anomalous characteristics, such as low temperature and low salinity. Also, isopycnals shoaled toward the coast and ZΩa was thus ~30 m in the nearshore area, in contrast with the oceanic region, where ZΩa was ~150 m. Prior to this study, there were no records of ZΩa in Todos Santos Bay, nor were there any records of its shallowness.
Highlights
The objective of this study was to assess the effect of the 2011 La Niña conditions on ZΩa in Todos Santos Bay (Baja California, Mexico) and surrounding waters
These equations were generated for coastal waters in the California Current System (CCS) in a way that hydrographic data could be used as an alternative when measurements of the carbonate system are insufficient (Juranek et al 2009, Alin et al 2012)
dissolved inorganic carbon (DIC) in the water samples was analyzed using the coulometric system described by Johnson et al (1987), while total alkalinity was measured by potentiometry according to Hernández-Ayón et al (1999)
Summary
En regiones donde el Ω del aragonita (Ωa) o de la calcita (Ωca) es >1 se favorece la formación de estructuras carbonatadas (conchas y exoesqueletos), pero si Ωa o Ωca son
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