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Changes in dominant mixing length scales as a driver of subpolar phytoplankton bloom initiation in the North Atlantic
Author(s) -
Brody Sarah R.,
Lozier M. Susan
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl059707
Subject(s) - thermocline , bloom , oceanography , algal bloom , spring bloom , stratification (seeds) , phytoplankton , sverdrup , climatology , mixed layer , mixing (physics) , environmental science , geology , nutrient , biology , ecology , physics , dormancy , seed dormancy , botany , germination , arctic , quantum mechanics
Subpolar phytoplankton blooms have traditionally been attributed to changes in the depth of the ocean's seasonal thermocline: as the upper ocean warms and stratifies in the spring, phytoplankton reside within increasingly shallow depths where they experience higher light levels, and, as a result, begin to bloom. Recent studies have challenged this explanation, proposing instead that bloom initiation is driven either by the onset of positive heat fluxes, decreases in wind strength, decreases in grazing pressure, or by eddy‐induced stratification. We compare traditional and recent ideas of bloom initiation and present a new argument that attributes the initiation to a decrease in the dominant mixing length scales in the upper ocean. From an examination of data across the subpolar North Atlantic, we find that decreases in this length scale are a better predictor of bloom initiation than current theories, thus providing a new explanation of bloom dynamics in a one‐dimensional framework.