Water masses as a unifying framework for understanding the Southern Ocean Carbon Cycle

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Author(s) Iudicone, D., Rodgers, K.B., Stendardo, I., Aumont, O., Madec, G., Bopp, L., Mangoni, O., d'Alcala', M. Ribera
Publication Type Journal Items, Publication Status: Published
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Title Water masses as a unifying framework for understanding the Southern Ocean Carbon Cycle
Author(s) Iudicone, D.
Rodgers, K.B.
Stendardo, I.
Aumont, O.
Madec, G.
Bopp, L.
Mangoni, O.
d'Alcala', M. Ribera
Journal or Series Title Biogeosciences
Volume Number 8
Issue Number 5
Start Page 1031
End Page 1052
ISSN 1726-4170
Publisher Copernicus
Publication Place Katlenburg-Lindau
Publication Date 2011
Abstract The scientific motivation for this study is to understand the processes in the ocean interior controlling carbon transfer across 30 degrees S. To address this, we have developed a unified framework for understanding the interplay between physical drivers such as buoyancy fluxes and ocean mixing, and carbon-specific processes such as biology, gas exchange and carbon mixing. Given the importance of density in determining the ocean interior structure and circulation, the framework is one that is organized by density and water masses, and it makes combined use of Eulerian and Lagrangian diagnostics. This is achieved through application to a global ice-ocean circulation model and an ocean biogeochemistry model, with both components being part of the widely-used IPSL coupled ocean/atmosphere/carbon cycle model. Our main new result is the dominance of the overturning circulation (identified by water masses) in setting the vertical distribution of carbon transport from the Southern Ocean towards the global ocean. A net contrast emerges between the role of Subantarctic Mode Water (SAMW), associated with large northward transport and ingassing, and Antarctic Intermediate Water (AAIW), associated with a much smaller export and outgassing. The differences in their export rate reflects differences in their water mass formation processes. For SAMW, two-thirds of the surface waters are provided as a result of the densification of thermocline water (TW), and upon densification this water carries with it a substantial di-apycnal flux of dissolved inorganic carbon (DIC). For AAIW, principal formatin processes include buoyancy forcing and mixing, with these serving to lighten CDW. An additional important formation pathway of AAIW is through the effect of interior processing (mixing, including cabelling) that serve to densify SAMW. A quantitative evaluation of the contribution of mixing, biology and gas exchange to the DIC evolution per water mass reveals that mixing and, secondarily, gas exchange, effectively nearly balance biology on annual scales (while the latter process can be dominant at seasonal scale). The distribution of DIC in the northward flowing water at 30 degrees S is thus primarily set by the DIC values of the water masses that are involved in the formation processes.
DOI 10.5194/bg-8-1031-2011
Additional Notes Received 14 April 2010, Revised 14 March 2011, Accepted 15 March 2011, Published 4 May 2011
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 006289717
Source Database ID WOS-000291003200001
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  author = "Iudicone, D. and Rodgers, K.B. and Stendardo, I. and Aumont, O. and Madec, G. and Bopp, L. and Mangoni, O. and d'Alcala', M. Ribera",
  title = "{W}ater masses as a unifying framework for understanding the {S}outhern {O}cean {C}arbon {C}ycle",
  journal = "Biogeosciences",
  year = 2011,
  volume = "8",
  number = "5",
  pages = "1031--1052",

E-Citations record created: Wed, 06 Jul 2011, 05:51:21 CET