Seasonality of downward carbon export in the Pacific Southern Ocean revealed by multi-year robotic observations
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2023 |
| Auteurs (5) | : | LACOUR Leo LLORT JORDI Joan BRIGGS Nathan STRUTTON Peter BOYD P,w |
| Revue scientifique | : | Nature Communications |
| Volume | : | 14 |
| Fascicule | : | 1 |
| Pages | : | |
| DOI | : | 10.1038/s41467-023-36954-7 |
| URL | : | https://doi.org/10.1038/s41467-023-36954-7 |
| Abstract | : | At high latitudes, the biological carbon pump, which exports organic matter from the surface ocean to the interior, has been attributed to the gravitational sinking of particulate organic carbon. Conspicuous deficits in ocean carbon budgets challenge this as a sole particle export pathway. Recent model estimates revealed that particle injection pumps have a comparable downward flux of particulate organic carbon to the biological gravitational pump, but with different seasonality. To date, logistical constraints have prevented concomitant and extensive observations of these mechanisms. Here, using year-round robotic observations and recent advances in bio-optical signal analysis, we concurrently investigated the functioning of two particle injection pumps, the mixed layer and eddy subduction pumps, and the gravitational pump in Southern Ocean waters. By comparing three annual cycles in contrasting physical and biogeochemical environments, we show how physical forcing, phytoplankton phenology and particle characteristics influence the magnitude and seasonality of these export pathways, with implications for carbon sequestration efficiency over the annual cycle. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Lacour L, Llort Jordi J, Briggs N, Strutton P, Boyd PW (2023) Seasonality of downward carbon export in the Pacific Southern Ocean revealed by multi-year robotic observations. Nat Commun 14 | doi: 10.1038/s41467-023-36954-7
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