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On the Robustness of Air-Sea Flux Estimates of Carbon Dioxide from Ocean Inversions
Mikaloff Fletcher, S. E.; Gruber, N. P.; Jacobson, A. et al.
2004AGU Fall Meeting
 

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Keywords :
4806 Carbon cycling; 4842 Modeling; 1615 Biogeochemical processes (4805); 0312 Air/sea constituent fluxes (3339; 4504); 0322 Constituent sources and sinks
Abstract :
[en] Inverse methods analogous to those used for atmospheric inversions have been adapted to estimate regional air-sea fluxes of carbon dioxide using ocean interior observations of dissolved inorganic carbon and related tracers and an Ocean General Circulation Model (OGCM). We estimate seperately the preindustrial component and the component due to the anthropogenic perturbation of atmospheric carbon dioxide. Previous sensitivity studies have shown that model circulation is one of the most important sources of error in the ocean inversion. We present estimates of preindustrial and anthropogenic air-sea carbon dioxide exchange using a suite of nine different OGCM's in order to quantify the robustness of our results and explore the role of different representations of ocean circulation in the inversion. Most of the large scale features of the inverse estimates are robust across all models. The preindustrial inverse estimates generally follow the expected pattern of uptake at high latitudes and out gassing in the tropics; however, all of the models call for out gassing in the Southern Ocean between 44S and 58 S. The greatest anthropogenic carbon uptake occurs at mid- to high- latitudes, with a large anthropogenic carbon sink in the Southern Ocean, while the bulk of the anthropogenic carbon storage occurs at mid-latitudes. Preliminary results also suggest interesting, robust differences between these inverse estimates and estimates from forward model simulations. Both the preindustrial and anthropogenic carbon dioxide flux estimates are most robust at mid and high northern latitudes, except for the high latitude North Atlantic. The carbon dioxide flux estimates are most uncertain in the Southern Ocean, where the inverse estimates are strongly dependent on the rates of deep water ventilation in the OGCM. The preindustrial inverse estimates for the Indian Ocean are also sensitive to the choice of OGCM, and the anthropogenic estimates have significant uncertainties in the tropical Pacific. Over large spatial scales, inverse estimates based on different OGCM's are in better agreement than estimates based on forward simulations of the same models, but this is not necessarily true for smaller model regions.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mikaloff Fletcher, S. E.;  Department of Atmospheric and Oceanic Sciences, The University of California, 5839 Slichter Hall, Los Angeles, CA 90095 United States
Gruber, N. P.;  Department of Atmospheric and Oceanic Sciences, The University of California, 5839 Slichter Hall, Los Angeles, CA 90095 United States
Jacobson, A.;  Department of Atmospheric and Oceanic Sciences, Princeton, PO Box CN710, Princeton, NJ 08544-0710 United States
Doney, S.;  Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA 02543-1543 United States
Dutkiewicz, S.;  Department of Earth, Atmosphere, and Planetary Sciences, Massachussets Institute of Technology, 54-1412, 77 Massachusetts Avenue, Cambridge, MA 02139 United States
Follows, M.;  Department of Earth, Atmosphere, and Planetary Sciences, Massachussets Institute of Technology, 54-1412, 77 Massachusetts Avenue, Cambridge, MA 02139 United States
Lindsay, K.;  Climate and Global Dynamics, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States
Menemenlis, D.;  Jet Propulsion Laboratory, MS 300-323, 4800 Oak Grove Dr, Pasedena, CA 91109 United States
Mouchet, Anne ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
On the Robustness of Air-Sea Flux Estimates of Carbon Dioxide from Ocean Inversions
Publication date :
December 2004
Event name :
AGU Fall Meeting
Event place :
San Francisco, United States
Event date :
13-17 Dec, 2004
Audience :
International
Available on ORBi :
since 09 May 2012

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