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Effects of Mesoscale Eddies on Global Ocean Distributions of Cfc-11, Co2 and Δ14C : Volume 3, Issue 4 (31/07/2006)

By Lachkar, Z.

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Book Id: WPLBN0004020923
Format Type: PDF Article :
File Size: Pages 53
Reproduction Date: 2015

Title: Effects of Mesoscale Eddies on Global Ocean Distributions of Cfc-11, Co2 and Δ14C : Volume 3, Issue 4 (31/07/2006)  
Author: Lachkar, Z.
Volume: Vol. 3, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Orr, J. C., Dutay, J., Delecluse, P., & Lachkar, Z. (2006). Effects of Mesoscale Eddies on Global Ocean Distributions of Cfc-11, Co2 and Δ14C : Volume 3, Issue 4 (31/07/2006). Retrieved from http://hawaiilibrary.net/


Description
Description: LSCE/IPSL, Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ, Gif-sur-Yvette, France. Global-scale tracer simulations are typically made at coarse resolution without explicitly modeling eddies. Here we ask what role do eddies play in ocean uptake, storage, and meridional transport of transient tracers. We made global anthropogenic transient-tracer simulations in non-eddying (2°cosΦ×2°, ORCA2) and eddying (½°cosΦ×½°, ORCA05) versions of the ocean general circulation model OPA9. We focus on the Southern Ocean where tracer air-sea fluxes are largest. Eddies have little effect on global and regional bomb Δ14C uptake and storage. Yet for anthropogenic CO2 and CFC-11, increased eddy activity reduces southern extratropical uptake by 28% and 25% respectively. There is a similar decrease in corresponding inventories, which provides better agreement with observations. With higher resolution, eddies strengthen upper ocean vertical stratification and reduce excessive ventilation of intermediate waters by 20% between 60° S and 40° S. By weakening the Residual Circulation, i.e., the sum of Eulerian mean flow and the opposed eddy-induced flow, eddies reduce the supply of tracer-impoverished deep waters to the surface near the Antarctic divergence, thus reducing the air-sea tracer flux. Consequently, inventories for both CFC-11 and anthropogenic CO2 decrease because their mixed layer concentrations in that region equilibrate with the atmosphere on relatively short time scales (15 days and 6 months, respectively); conversely, the slow air-sea equilibration of bomb Δ14C of 6 years, gives surface waters little time to exchange with the atmosphere before they are subducted.

Summary
Effects of mesoscale eddies on global ocean distributions of CFC-11, CO2 and Δ14C

 

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