Regridded subset of MODIS chlorophyll, OC-CCI chlorophyll, MODIS sea surface temperature; basin bathymetric depth

• Main Author: Britten, Gregory
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2022
• Subjects: North Atlantic
• Online Access: https://doi.org/10.5061/dryad.k6djh9w6w

The North Atlantic phytoplankton bloom depends on a confluence of environmental factors that drive transient periods of exponential phytoplankton growth and interannual variability in bloom magnitude. I analyze interannual bloom variability in the North Atlantic via extreme value theory where the Generalized Extreme Value Distribution (GEVD) is fitted spatially to annual maxima of satellite-measured surface chlorophyll. I find excellent agreement between the observed distribution of interannual bloom maxima and those predicted from the GEVD. The spatial distribution of fitted GEVD parameters closely follows basin bathymetry where the largest extremes and heaviest distribution tails are found on the continental shelves and slopes. Trend analyses suggest weak evidence for changes in GEVD parameters, despite regional trends in mean chlorophyll levels and sea surface temperature. These results provide a framework to quantify interannual bloom variability and call for further work examining how extreme blooms propagate through food webs and contribute to carbon export. Funding provided by: Simons Foundation Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000893 Award Number: 645921