Concepts towards a global mechanistic mapping of ocean carbon export
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2023 |
| Auteurs (9) | : | LAURENCEAU-CORNEC E,c MONGIN Mathieu TRULL Thomas,w BRESSAC Matthieu CAVAN E,l BACH Lennart,t LE MOIGNE Frédéric,a,c PLANCHON Frédéric BOYD P,w |
| Revue scientifique | : | Global Biogeochemical Cycles |
| Volume | : | |
| Fascicule | : | |
| Pages | : | |
| DOI | : | 10.1029/2023GB007742 |
| URL | : | https://doi.org/10.1029/2023GB007742 |
| Abstract | : | Abstract The gravitational sinking of organic debris from ocean ecosystems is a dominant mechanism of the biological carbon pump (BCP) that regulates global climate. The fraction of primary production exported downward, the e-ratio, is an important but poorly constrained BCP metric. In mid- and high-latitude oceans, seasonal and local variations of sinking particle fluxes modulate strongly the e-ratio. These locally-specific e-ratio variations and their ecological foundations are here encapsulated in the term ?export systems? (ES). ES have been partly characterized for a few ocean locations, but remain largely ignored over most of ocean's surface. Here, in a fully conceptual approach and with the primary aim to understand rather than to estimate ocean carbon export, we combine biogeochemical (BGC) modeling with satellite observations to map ES at fine spatio-temporal scales. We identify four plausible ES with distinct e-ratio seasonalities across mid- and high-latitude oceans. The ES map confirms the outlines of traditional BGC provinces, and unveils new boundaries indicating where (and how) the annual relationship between carbon export and production changes markedly. At six sites where ES features can be partially inferred from in situ data, we test our approach and propose key ecological processes driving carbon export. In the light of our findings, a re-examination of 1,841 field-based e-ratios could challenge the conventional wisdom that e-ratios change strongly with latitude, suggesting a possible seasonal artefact caused by the timing of observations. By deciphering carbon export mechanistically, our conceptual ES map gives timely directions to emergent ocean robotic explorations of the BCP. |
| Mots-clés | : | biogeochemical provinces; carbon export efficiency; net primary productivity; ocean biological carbon pump; planktonic communities; seasonality |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Laurenceau-Cornec EC, Mongin M, Trull TW, Bressac M, Cavan EL, Bach LT, Le Moigne FAC, Planchon F, Boyd PW (2023) Concepts towards a global mechanistic mapping of ocean carbon export. Global Biogeochem Cy | doi: 10.1029/2023GB007742
|