Relaxation of Wind Stress Drives the Abrupt Onset of Biological Carbon Uptake in the Kerguelen Bloom: A Multisensor Approach
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2020 |
| Auteurs (6) | : | PELLICHERO Violaine BOUTIN Jacqueline CLAUSTRE Herve MERLIVAT Liliane SALLÉE Jean-baptiste BLAIN Séphane |
| Revue scientifique | : | Geophysical Research Letters |
| Volume | : | 47 |
| Fascicule | : | 9 |
| Pages | : | |
| DOI | : | 10.1029/2019gl085992 |
| URL | : | https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL085992 |
| Abstract | : | Abstract 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. |
| Mots-clés | : | onset of the phytoplankton bloom, mixing-layer depth, in situ high-resolution data, mixed-layer depth, air-sea heat flux, wind stress |
| Commentaire | : | e2019GL085992 2019GL085992 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Pellichero V, Boutin J, Claustre H, Merlivat L, Sallée J-B, Blain S (2020) Relaxation of Wind Stress Drives the Abrupt Onset of Biological Carbon Uptake in the Kerguelen Bloom: A Multisensor Approach. Geophys Res Lett 47 | doi: 10.1029/2019gl085992
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