Journal of Geophysical Research: Oceans
The California Current System is a diatom‐dominated region characterized by seasonal coastal upwelling and additional elevated mesoscale activity. Cyclonic mesoscale eddies in the region trap productive coastal waters with their planktonic communities and transport them offshore with limited interaction with surrounding waters, effectively acting as natural mesocosms, where phytoplankton populations undergo ecological succession as eddies age. This study examines diatom community composition within two mesoscale cyclonic eddies that formed in the same region of the California Current System 2 months apart and in the California Current waters surrounding them. The diatom communities were analyzed in the context of shifting environmental gradients and through a lens of community succession to expand our understanding of biophysical interactions in California Current System cyclonic eddies. Diatom communities within each eddy were different from non‐eddy communities and varied in concert with salinity and dissolved iron (Fe) concentrations. The younger, nearshore eddy displayed higher macronutrient and dissolved Fe concentrations, had higher values for diatom Shannon diversity and evenness, and had nutrient ratios indicative of either eventual silicic acid (Si) or Fe limitation or possibly co‐limitation. The older, offshore eddy displayed low macronutrient and dissolved Fe concentrations, was likely nitrate‐limited, and had lower diatom Shannon diversity and evenness indices. Sequences from the genus Rhizosolenia, some of which form vertically migrating mats to bypass nitrate limitation, dominated in the older eddy. This is of potential significance as the prevalence of Rhizosolenia mats could impact estimates of carbon cycling and export in the wider California coastal area.
An edited version of this paper was published by AGU. Published 2023 American Geophysical Union.
Kuhn, A. M., Mazloff, M., Dutkiewicz, S., Jahn, O., Clayton, S., Rynearson, T., & Barton, A. D. (2023). A global comparison of marine chlorophyll variability observed in Eulerian and Lagrangian perspectives. Journal of Geophysical Research: Oceans, Volume 128, Issue 7, e2023JC019801.
Version of record included in institutional repository after a 6 month embargo in accordance with publisher policy.
Article states: "For this study, we used publicly available satellite chlorophyll, drifter trajectories and wind speed data. Daily satellite chlorophyll data at 4-km resolution, version 3.1, from September 1997 to June 2018 was obtained from the European Space Agency Ocean Colour—Climate Change Initiative (ESA OC-CCI; Sathyendranath et al., 2020). Drifter trajectories (longitude and latitude locations) were obtained from the Global Drifter Program (GDP; Lumpkin & Centurioni, 2019). Wind speed data was obtained from ECMWF Reanalysis v5 (ERA5; Hersbach et al., 2017). In addition, model data used in this study are publicly available at the UC San Diego Library Digital Collections (Jahn et al., 2019). Eulerian and Lagrangian satellite chlorophyll variance differences estimated in this study are available in a public repository (Kuhn et al., 2023)."
Links to data as shown in article references are:
Sathyendranath et al., 2020: https://catalogue.ceda.ac.uk/uuid/99348189bd33459cbd597a58c30d8d10
Lumpkin & Centurioni, 2019: https://doi.org/10.25921/7ntx-z961
Hersbach et al., 2017: https://doi.org/10.24381/cds.143582cf
Jahn et al., 2019: https://doi.org/10.6075/J0BR8QJ1
Kuhn et al., 2023: https://zenodo.org/badge/latestdoi/661844039s
Original Publication Citation
Kuhn, A. M., Mazloff, M., Dutkiewicz, S., Jahn, O., Clayton, S., Rynearson, T., & Barton, A. D. (2023). A global comparison of marine chlorophyll variability observed in Eulerian and Lagrangian perspectives. Journal of Geophysical Research: Oceans, 128(7), 1-12, Article e2023JC019801. https://doi.org/10.1029/2023JC019801
Kuhn, Angela M.; Mazloff, Matthew; Dutkiewicz, Stephanie; Jahn, Oliver; Clayton, Sophie; Rynearson, Tatiana; and Barton, Andrew D., "A Global Comparison of Marine Chlorophyll Variability Observed in Eulerian and Lagrangian Perspectives" (2023). OES Faculty Publications. 485.
Available for download on Friday, December 29, 2023