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Dive into the research topics where Lionel Guez is active.

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Featured researches published by Lionel Guez.


Climate Dynamics | 2013

Tropical variability and stratospheric equatorial waves in the IPSLCM5 model

Pauline Maury; François Lott; Lionel Guez; Jean-Philippe Duvel

The atmospheric variability in the equatorial regions is analysed in the Earth System Model pre-industrial simulation done at IPSL in the framework of CMIP5. We find that the model has an interannual variability of about the right amplitude and temporal scale, when compared to the El-Niño Southern Oscillation (ENSO), but that is too confined to the western Pacific. At the intra-seasonal periods, the model variability lacks of large-scale organisation, and only produces one characteristic Madden-Julian Oscillation every 10 winters typically. At shorter time-scales and in the troposphere, the model has Rossby and Kelvin Convectively Coupled Equatorial Waves (CCEWs), but underestimates the Kelvin CCEWs signal on OLR. In the model stratosphere, a composite analysis shows that the Temperature and velocities fluctuations due to the Kelvin waves are quite realistic. In the model nevertheless, the stratospheric waves are less related to the convection than in the observations, suggesting that their forcing by the midlatitudes plays a larger role. Still in the model, the Kelvin waves are not predominantly occurring during the life cycle of the tropospheric Kelvin CCEWs, a behaviour that we find to be dominant in the observations. The composite analysis is also used to illustrate how the waves modify the zonal mean-flow, and to show that the model Kelvin waves are too weak in this respect. This illustrates how a model can have a reasonable Kelvin waves signal on the velocities and temperature, but can at the same time underestimate their amplitude to modify the mean flow. We also use this very long simulation to establish that in the model, the stratospheric equatorial waves are significantly affected by ENSO, hence supporting the idea that the ENSO can have an influence on the Quasi-Biennial Oscillation.


Climate Dynamics | 2013

Impact of the LMDZ atmospheric grid configuration on the climate and sensitivity of the IPSL-CM5A coupled model

Frédéric Hourdin; Marie-Alice Foujols; Francis Codron; Virginie Guemas; Jean-Louis Dufresne; Sandrine Bony; Sebastien Denvil; Lionel Guez; François Lott; Josefine Ghattas; Pascale Braconnot; Olivier Marti; Yann Meurdesoif; Laurent Bopp


Quarterly Journal of the Royal Meteorological Society | 2013

Gravity waves over Antarctica and the Southern Ocean: consistent momentum fluxes in mesoscale simulations and stratospheric balloon observations

Riwal Plougonven; Albert Hertzog; Lionel Guez


Geophysical Research Letters | 2012

A stochastic parameterization of non-orographic gravity waves: Formalism and impact on the equatorial stratosphere

François Lott; Lionel Guez; Pauline Maury


Quarterly Journal of the Royal Meteorological Society | 2010

Sensitivity study for mesoscale simulations of gravity waves above Antarctica during Vorcore

Riwal Plougonven; Antonin Arsac; Albert Hertzog; Lionel Guez; F. Vial


Symposium OGOA | 2013

A stochastic parameterization of the gravity waves due to convection and impact on the equatorial stratosphere

Pauline Maury; Lionel Guez; François Lott


Archive | 2013

IPSL-CM5A-LR model output prepared for CMIP5 RCP2.6, served by ESGF

Sebastien Denvil; Marie Alice Foujols; Arnaud Caubel; Olivier Marti; Jean-Louis Dufresne; Laurent Bopp; P. Cadule; Christian Ethé; A. Idelkadi; Martial Mancip; Sébastien Masson; Juliette Mignot; Musat Ionela; Y. Balkanski; Slimane Bekki; Sandrine Bony; Pascale Braconnot; Patrick Brockman; Francis Codron; Anne Cozic; David Cugnet; L. Fairhead; Thierry Fichefet; Simona Flavoni; Lionel Guez; Eric Guilyardi; Frédéric Hourdin; Josefine Ghattas; Masa Kageyama; Myriam Khodri


Geophysical Research Letters | 2012

A stochastic parameterization of non-orographic gravity waves: Formalism and impact on the equatorial stratosphere: STOCHASTIC GRAVITY WAVES AND QBO

François Lott; Lionel Guez; Pauline Maury


Archive | 2011

Tropical variability and stratospheric equatorial waves in the

Pauline Maury; François Lott; Lionel Guez; Jean-Philippe Duvel


Archive | 2010

Gravity wave generation from jets and fronts: idealized and real-case simulations

Riwal Plougonven; Antonin Arsac; Albert Hertzog; Lionel Guez; Francois Vial

Collaboration


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François Lott

École Normale Supérieure

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Pauline Maury

École Normale Supérieure

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Riwal Plougonven

École Normale Supérieure

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Antonin Arsac

École Normale Supérieure

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Albert Hertzog

Centre national de la recherche scientifique

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Francois Vial

Centre national de la recherche scientifique

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Frédéric Hourdin

Centre national de la recherche scientifique

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Olivier Marti

Centre national de la recherche scientifique

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Sebastien Denvil

Centre national de la recherche scientifique

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Albert Hertzog

Centre national de la recherche scientifique

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