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Anthropogenic carbon in the ocean - surface to interior connections


Groeskamp, S and Lenton, A and Matear, R and Sloyan, BM and Langlais, C, Anthropogenic carbon in the ocean - surface to interior connections, Global Biogeochemical Cycles, 30, (11) pp. 1682-1698. ISSN 0886-6236 (2016) [Refereed Article]


Copyright Statement

2016. American Geophysical Union. All Rights Reserved.

DOI: doi:10.1002/2016GB005476


Quantifying the surface to interior transport of anthropogenic carbon (CA) is critical for projecting future carbon uptake and for improved understanding of the role of the oceans in the global carbon cycle. Here we develop and apply a diagnostic tool that provides a volumetric stream function in (CA,σ0) coordinates to calculate the total diapycnal CA transport in the ocean, where σ0 is the surface referenced potential density anomaly. We combine this with air-sea fluxes of CA to infer the internal ocean mixing of CA to obtain a closed globally integrated budget analyses of the ocean's CA transport. This diagnostic separates the contribution from the mean flow, seasonal cycles, trend, surface fluxes, and mixing in the distribution and the accumulation of CA in the ocean. We find that the redistribution of CA from the surface to the interior of the ocean is due to an interplay between circulation and mixing. The circulation component is dominated by the mean flow; however, effects due to seasonal cycles are significant for the CA redistribution. The two most important pathways for CA subduction are through the transformation of thermocline water (TW) into subantarctic mode water and by transformation of Circumpolar Deep Water (CDW) into lighter Antarctic Intermediate Water. The results suggest that an accurate representation of intermediate and mode water formation, deep water formation, and spatial and temporal distribution of ocean mixing in ocean models is essential to simulate and project the oceanic uptake of CA.

Item Details

Item Type:Refereed Article
Keywords:anthropogenic carbon, chemical oceanography, climate
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate change models
UTAS Author:Lenton, A (Dr Andrew Lenton)
ID Code:114275
Year Published:2016
Web of Science® Times Cited:13
Deposited By:Ecology and Biodiversity
Deposited On:2017-02-09
Last Modified:2018-04-19
Downloads:102 View Download Statistics

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