Open AccessExtreme value distributions describe interannual variability in the seasonal North Atlantic phytoplankton bloom
Author(s) -
Britten Gregory L.
Publication year - 2022
Publication title -
limnology and oceanography letters
Language(s) - English
Resource type - Journals
ISSN - 2378-2242
DOI - 10.1002/lol2.10247
Subject(s) - bloom , phytoplankton , extreme value theory , oceanography , environmental science , bathymetry , spring bloom , algal bloom , maxima , chlorophyll a , climatology , continental shelf , sea surface temperature , geology , ecology , biology , mathematics , statistics , nutrient , art , botany , performance art , art history
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.