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As the pigment present in all photosynthetic phytoplankton species, chlorophyll-a (CHLA) is the most common indicator of the phytoplankton biomass in any aquatic ecosystem, and thus the quantification of its seasonal variability is key to understanding the dynamics of the marine ecosystem. Based on in-situ observations systematically gathered during four seasons in different years, this paper reports the surface CHLA concentrations in the central part of the Bay of La Paz, Gulf of California, Mexico. The in-situ data are compared and supported by satellite observations at 1 km/pixel of resolution from the Moderate Resolution Imaging Spectroradiometer. The results show clear seasonal variability, with the highest values recorded during winter time, while the lowest values were recorded during summer. Spring and fall represented seasons of transition. Satellite observations were consistent with the variability observed in in-situ data. The seasonal variability observed could be related to different mechanisms including the local atmospheric forcing, which induces wind-driven mixing and changes in the heating/cooling of the water column. The results presented here contribute to our understanding of the phytoplankton population dynamics in the Bay of La Paz, a highly productive region that supports different species with great importance both ecologically and economically.

Field and satellite observations on the seasonal variability of the surface chlorophyll-a in the Bay of La Paz, Gulf of California, Mexico