References of "Mouchet, Anne"
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See detailLOVECLIM, a three-dimensional model of the Earth system for investigating long-term climate changes
Driesschaert, E.; Brovkin, V.; Fichefet, T. et al

Conference (2003, September)

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See detailLOVECLIM, a three-dimensional model of the Earth system for investigating long-term climate changes
Driesschaert, E.; Fichefet, T.; Goosse, G. et al

Poster (2003, April 08)

A three-dimensional global model of the Earth system suitable for studying the long-term evolution of climate (LOVECLIM) has been recently developed. This model is made up of a coarse-resolution three ... [more ▼]

A three-dimensional global model of the Earth system suitable for studying the long-term evolution of climate (LOVECLIM) has been recently developed. This model is made up of a coarse-resolution three-dimensional atmosphere-sea-ice-ocean model (ECBILT-CLIO), a dynamical model of the continental biosphere (VECODE), a comprehensive model of the oceanic carbon cycle (LOCH), and a high-resolution thermomechanical model of the Greenland and Antarctic ice sheets (AGISM). The atmospheric component has the big advantage that it has been simplified to a level that makes runs on a multi-century time-scale computationaly feasible, while still being capable of producing results that, on the whole, are comparable to those of atmospheric general circulation models. The performance of the coupled model is evaluated by performing ensemble simulations over the period 1500-2000 and by comparing the model results to available climate reconstructions. In these simulations, the following forcings are taken into consideration : the variations in solar irradiance, the volcanic activity, the anthropogenic emissions of CO2, and the changes in concentration of other greenhouse gases and sulphate aerosols resulting from human activities. In the future, the model will be used to investigate the evolution of climate and sea level over the third millennium. [less ▲]

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See detailA note on the age of radioactive tracers
Delhez, Eric ULg; Deleersnijder, Eric; Mouchet, Anne ULg et al

in Journal of Marine Systems (2003), 38(3-4), 277-286

wThe age of a water mass is often estimated experimentally using the radio-age computed from the distribution of a radioactive tracer (radiocarbon, helium-tritium). Deleersnijder et al. [J. Mar. Syst. 28 ... [more ▼]

wThe age of a water mass is often estimated experimentally using the radio-age computed from the distribution of a radioactive tracer (radiocarbon, helium-tritium). Deleersnijder et al. [J. Mar. Syst. 28 (2001) 229.] have shown that the radio-age underestimates the age of the water and is larger than the age of the radioactive tracer used for its evaluation. This result is generalized here to radio-ages computed from the ratio of two radioactive tracers. The differences between the different ages are also studied analytically and numerically as functions of the decay rate of the radioactive tracers. For small decay rates, the difference between the age of the water mass and the radio-age is shown to be proportional to the decay rate. It depends also on the level of mixing in the system; even radioactive tracers with small decay rates can provide poor estimates of the age of the water mass in a strongly diffusive flow. For small half lives, both the radio-age and the age of radioactive tracers decrease as the inverse of the square root of the decay rate. The same analysis applies to some extent to the estimates of the age of a water mass from stable tracers with known time dependent sources (e.g. chloroflurocarbons). (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailMulti-tracer constraints on ocean storage of anthropogenic CO2
Aumont, O.; Caldeira, K.; Campin, J. et al

Poster (2002, December 01)

During the second phase of the Ocean Carbon-Cycle Model Intercomparison, 13 models simulated oceanic uptake of anthropogenic CO2 for the period 1765 to 2000. For the 1980s, models agreed to within +/- 22 ... [more ▼]

During the second phase of the Ocean Carbon-Cycle Model Intercomparison, 13 models simulated oceanic uptake of anthropogenic CO2 for the period 1765 to 2000. For the 1980s, models agreed to within +/- 22% (1.99 +/- 0.43 Pg C yr-1, half the range over the mean). For the 1990s the OCMIP-2 models predict a 24% uptake increase (2.38 +/- 0.53 Pg C yr-1), in contrast with the 1980s-to-1990s decrease predicted by the most recent IPCC Third Assessment Report Chapter 3. However, the IPCC's estimates are based on atmospheric O2 measurements which are susceptible to error due to interannual variations in air-sea O2 fluxes. It appears likely that the OCMIP-2 range for the modern uptake of anthropogenic CO2 brackets real ocean uptake for four reasons: (1) the large model diversity; (2) the range of OCMIP-2 models bracket observed tracer constraints (CFC-11 along sections, global mean deep-ocean 14C); (3) the simulated global storage of anthropogenic CO2 correlates with the simulated global storage of CFC-11 and the simulated global-mean, deep-ocean natural C-14;(4) the simulated global inventories of anthropogenic CO2 bracket data-based estimates for that same tracer. In theory, the CFC-11 and C-14 data constraints should allow us to weight the models, and thus narrow uncertainties, based on how models perform in regards to matching ocean inventories of these independent tracers. Here we will discuss progress on this effort, in regards to global and regional inventories. [less ▲]

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See detailCAT, The Constituent-oriented Age Theory, and its application to marine flows
Deleersnijder, Eric; Delhez, Eric ULg; Mouchet, Anne ULg et al

Conference (2002, May)

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See detailEvaluation of deep water circulation with natural C-14 and helium-3 during OCMIP-2
Dutay, J.-C; Jean-Baptiste, P; Maier-Reimer, E. et al

Conference (2002, May)

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See detailEvaluation of ocean model ventilation with CFC-11: comparison of 13 global ocean models
Dutay, J.-C.; Bullister, J. L.; Doney, S. C. et al

in Ocean Modelling (2002), 4(2), 89-120

We compared the 13 models participating in the Ocean Carbon Model Intercomparison Project (OCMIP) with regards to their skill in matching observed distributions of CFC-11. This analysis characterizes the ... [more ▼]

We compared the 13 models participating in the Ocean Carbon Model Intercomparison Project (OCMIP) with regards to their skill in matching observed distributions of CFC-11. This analysis characterizes the abilities of these models to ventilate the ocean on timescales relevant for anthropogenic CO2 uptake. We found a large range in the modeled global inventory (+/- 30\%), mainly due to differences in ventilation from the high latitudes. In the Southern Ocean, models differ particularly in the longitudinal distribution of the CFC uptake in the intermediate water, whereas the latitudinal distribution is mainly controlled by the subgrid-scale parameterization. Models with isopycnal diffusion and eddy-induced velocity parameterization produce more realistic intermediate water ventilation. Deep and bottom water ventilation also varies substantially between the models. Models coupled to a sea-ice model systematically provide more realistic AABW formation source region; however these same models also largely overestimate AABW ventilation if no specific parameterization of brine rejection during sea-ice formation is included. In the North Pacific Ocean, all models exhibit a systematic large underestimation of the CFC uptake in the thermocline of the subtropical gyre, while no systematic difference toward the observations is found in the subpolar gyre. In the North Atlantic Ocean, the CFC uptake is globally underestimated in subsurface. In the deep ocean, all but the adjoint model, failed to produce the two recently ventilated branches observed in the North Atlantic Deep Water (NADW). Furthermore, simulated transport in the Deep Western Boundary Current (DWBC) is too sluggish in all but the isopycnal model, where it is too rapid. (C) 2002 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailTransient behaviour of water ages in the World Ocean
Deleersnijder, Eric; Mouchet, Anne ULg; Delhez, Eric ULg et al

in Mathematical & Computer Modelling (2002), 36(1-2), 121-127

The transient behaviour of the age of the water and that of the surface water is studied in the World Ocean. At any time and position, the age of the water, the age and the concentration of the surface ... [more ▼]

The transient behaviour of the age of the water and that of the surface water is studied in the World Ocean. At any time and position, the age of the water, the age and the concentration of the surface water are seen to obey a simple algebraic relation. The latter is illustrated by means of results of a three-dimensional World Ocean model and the analytical solution of an idealised, purely-diffusive, one-dimensional problem. (C) 2002 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailThe age, a tool for understanding complex fluid flows
Deleersnijder, E.; Beckers, Jean-Marie ULg; Campin, J.-M. et al

Conference (2000, May)

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See detailUsing natural radiocarbon to assess the effects of numerics on biological tracers
Campin, J.-M.; Mouchet, Anne ULg

Conference (1999, July)

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See detailCoupled modelling of global ocean circulation and carbon cycle
Mouchet, Anne ULg

Conference (1999, May)

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See detailGlobal distributions of upper ocean CO2 and O2
Monfray, P.; Orr, J.; Stoens, A. et al

Conference (1999)

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See detailA discussion of methods for estimating residual fluxes in strong tidal estuaries
Regnier, P.; Mouchet, Anne ULg; Wollast, R. et al

in Continental Shelf Research (1998), 18

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See detailComparison of carbon cycles at LGM and Holocene
Mouchet, Anne ULg; Maier-Reimer, E.; Winguth, A.

Conference (1997, September)

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See detailOn the estimation of estuarine contaminant fluxes
Regnier, P.; Mouchet, Anne ULg; Ronday, François ULg et al

in ICES proceedings of the Scientific Symposium on the 1993 North Sea Quality Status Report (1996)

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