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Relaxation of Wind Stress Drives the Abrupt Onset of Biological Carbon Uptake in the Kerguelen Bloom: A Multisensor Approach
Author(s) -
Pellichero Violaine,
Boutin Jacqueline,
Claustre Hervé,
Merlivat Liliane,
Sallée JeanBaptiste,
Blain Stéphane
Publication year - 2020
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 - 10.1029/2019gl085992
Subject(s) - bloom , thermocline , biogeochemical cycle , mixed layer , wind stress , environmental science , algal bloom , argo , stratification (seeds) , shoaling and schooling , oceanography , spring bloom , atmospheric sciences , carbon cycle , climatology , geology , phytoplankton , chemistry , ecosystem , biology , seed dormancy , ecology , germination , botany , organic chemistry , dormancy , nutrient , environmental chemistry
We deployed sensors for physical and biogeochemical measurements on one Eulerian mooring and two Lagrangian biogeochemical Argo floats on the Kerguelen Plateau. High temporal and vertical resolution measurements revealed an abrupt shoaling of both the mixed‐layer depth and mixing‐layer depth. The sudden stratification was concomitant with the start of significant biological activity detected by chlorophyll‐a accumulation, oxygen oversaturation, and dissolved inorganic carbon drawdown. The net community production computed in the mixing‐layer during the onset period of 9 days was 119 ± 7 mmol·m −2 ·day −1 . While it is generally admitted that bloom initiation is mostly driven by the onset of positive heat fluxes, our results suggest that this is not a sufficient condition. Here we report that the decrease in the depth over which wind mixes the upper layer drives the initiation of the bloom. These results suggest that future atmospheric changes in Southern Ocean could impact the phenology of the blooms.