| Title: |
Southern Ocean Carbon Export Revealed by Backscatter and Oxygen Measurements From BGC-Argo Floats |
| Authors: |
Liniger, Guillaume; Moreau, Sebastien Daniel Vincent; Lannuzel, Delphine; Carranza, Magdalena M.; Strutton, Peter G. |
| Publisher Information: |
Wiley |
| Publication Year: |
2025 |
| Collection: |
University of Tromsø: Munin Open Research Archive |
| Description: |
The Southern Ocean (south of 30°S) contributes significantly to global ocean carbon uptake through the solubility, physical and biological pumps. Many studies have estimated carbon export to the deep ocean, but very few have attempted a basin-scale perspective, or accounted for the sea-ice zone (SIZ). In this study, we use an extensive array of BGC-Argo floats to improve previous estimates of carbon export across basins and frontal zones, specifically including the SIZ. Using a new method involving changes in particulate organic carbon and dissolved oxygen along the mesopelagic layer, we find that the total Southern Ocean carbon export from 2014 to 2022 is 2.69 ± 1.23 PgC y −1 . The polar Antarctic zone contributes the most (41%) with 1.09 ± 0.46 PgC y −1 . Conversely, the SIZ contributes the least (8%) with 0.21 ± 0.09 PgC y −1 and displays a strong shallow respiration in the upper 200 m. However, the SIZ contribution can increase up to 14% depending on the depth range investigated. We also consider vertical turbulent fluxes, which can be neglected at depth but are important near the surface. Our work provides a complementary approach to previous studies and is relevant for work that focuses on evaluating the biogeochemical impacts of changes in Antarctic sea-ice extent. Refining estimates of carbon export and understanding its drivers ultimately impacts our comprehension of climate variability at the global ocean scale. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
Global Biogeochemical Cycles; EU: 350906).; info:eu-repo/grantAgreement/EC/European Research Council/246777/EU/ Remotely sensed biogeochemical cycles in the ocean/REMOCEAN; FRIDAID 2378050; https://hdl.handle.net/10037/37040 |
| DOI: |
10.1029/2024GB008193 |
| Availability: |
https://hdl.handle.net/10037/37040; https://doi.org/10.1029/2024GB008193 |
| Rights: |
Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) ; openAccess ; Copyright 2025 The Author(s) ; https://creativecommons.org/licenses/by-nc/4.0 |
| Accession Number: |
edsbas.1118CB9 |
| Database: |
BASE |