Document of bibliographic reference 359049

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Improved winter data coverage of the Southern Ocean CO₂ sink from extrapolation of summertime observations

Abstract

The Southern Ocean is an important sink of anthropogenic CO₂, but it is among the least well-observed ocean basins, and consequentially substantial uncertainties in the CO₂ flux reconstruction exist. A recent attempt to address historically sparse wintertime sampling produced ‘pseudo’ wintertime observations of surface pCO₂ using subsurface summertime observations south of the Antarctic Polar Front. Here, we present an estimate of the Southern Ocean CO₂ sink that combines a machine learning-based mapping method with an updated set of pseudo observations that increases regional wintertime data coverage by 68% compared with the historical dataset. Our results confirm the suggestion that improved winter coverage has a modest impact on the reconstruction, slightly strengthening the uptake trend in the 2000s. After also adjusting for surface boundary layer temperature effects, we find a 2004-2018 mean sink of −0.16 ± 0.07 PgC yr⁻¹ south of the Polar Front and −1.27 ± 0.23 PgC yr⁻¹ south of 35°S, consistent with independent estimates from atmospheric data.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000879037400002

Bibliographic citation

Mackay, N.; Watson, A.J.; Suntharalingam, P.; Chen, Z.; Landschützer, P. (2022). Improved winter data coverage of the Southern Ocean CO₂ sink from extrapolation of summertime observations. Commun. Earth Environ. 3(1): 265. https://dx.doi.org/10.1038/s43247-022-00592-6

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true