Particulate concentration and seasonal dynamics in the mesopelagic ocean based on the backscattering coefficient measured with Biogeochemical-Argo floats
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2017 |
| Auteurs (3) | : | POTEAU Antoine BOSS Emmanuel CLAUSTRE Herve |
| Revue scientifique | : | Geophysical Research Letters |
| Volume | : | |
| Fascicule | : | |
| Pages | : | |
| DOI | : | 10.1002/2017GL073949 |
| URL | : | http://dx.doi.org/10.1002/2017gl073949 |
| Abstract | : | We explore a novel and spatially extensive dataset obtained from Biogeochemical-Argo (or BGC-Argo) floats, containing 16,796 profiles of the particulate backscattering coefficient at 700nm (bbp(700)) measured with three different sensors. We focus at the 900-950m depth interval (within the mesopelagic), where we blackfound values to be relatively constant. While we find significant differences between estimates of bbp(700) obtained with different sensors (≈30% disagreement), the median values in most oceanic regions obtained with blacka single type of sensor are within 50% of each other and are consistent with measurements of suspended mass conducted in the early 1970's. Deviations from the quasi-constant background value likely indicate times and locations associated with higher particulate export to depth. Indeed, we observe that in productive high latitude regions, a deep seasonal signal is observed, with enhanced values recorded blacka few months after surface spring/summer maximal concentrations. In addition, the deep bbp(700) is highest in regions exhibiting suboxic-anoxic conditions (e.g. Northern Indian Ocean), which have been associated with local particulate production as well as reduced particle flux attenuation. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Poteau A, Boss E, Claustre H (2017) Particulate concentration and seasonal dynamics in the mesopelagic ocean based on the backscattering coefficient measured with Biogeochemical-Argo floats. Geophys Res Lett | doi: 10.1002/2017GL073949
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