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RISRelations between Annular Modes and the Mean State: Southern Hemisphere Winter
Publisher: American Meteorological Society
Abstract: In a zonally symmetric climatology with a single eddy-driven jet, such as prevails in the Southern Hemisphere summer, the midlatitude variability is dominated by fluctuations of the jet around its mean position, as described ...
Relation between Annular Modes and the Mean State: Southern Hemisphere Summer
Publisher: American Meteorological Society
Abstract: The annular modes emerge as the leading mode of extratropical month-to-month climate variability in both hemispheres. Here the influence of the background state on the structure and dynamics of the Southern Hemisphere ...
Southern Hemisphere Jet Variability in the IPSL GCM at Varying Resolutions
Publisher: American Meteorological Society
Abstract: luctuations of the Southern Hemisphere eddy-driven jet are studied in a suite of experiments with the Laboratoire de Météorologie Dynamique, version 4 (LMDZ4) atmospheric GCM with varying horizontal resolution, in coupled ...
Differing Impacts of Resolution Changes in Latitude and Longitude on the Midlatitudes in the LMDZ Atmospheric GCM
Publisher: American Meteorological Society
Abstract: his article examines the sensitivity of the Laboratoire de Météorologie Dynamique Model with Zoom Capability (LMDZ), a gridpoint atmospheric GCM, to changes in the resolution in latitude and longitude, focusing on the ...
A Short-Term Negative Eddy Feedback on Midlatitude Jet Variability due to Planetary Wave Reflection
Publisher: American Meteorological Society
Abstract: three-level quasigeostrophic model on the sphere is used to identify the physical nature of the negative planetary wave feedback on midlatitude jet variability. A first approach consists of studying the nonlinear evolution ...
Positive and Negative Eddy Feedbacks Acting on Midlatitude Jet Variability in a Three-Level Quasigeostrophic Model
Publisher: American Meteorological Society
Abstract: AbstractThe variability of midlatitude jets is investigated in a long-term integration of a dry three-level quasigeostrophic model on the sphere. As for most observed jets, the leading EOF of the zonal-mean wind corresponds ...
An Improved Scheme for Interpolating between an Atmospheric Model and Underlying Surface Grids near Orography and Ocean Boundaries
Publisher: American Meteorological Society
Abstract: To take into account the strong nonlinearities of vertical fluxes due to small-scale heterogeneities of surface properties, more and more coupled general circulation models compute part of their atmospheric physical ...
Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting
Publisher: American Meteorological Society
Abstract: his paper explores the impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting. To that end, the GCM LMDZ5A of the Laboratoire de Météorologie Dynamique is coupled to a slab ocean, ...
Influence of Mean State Changes on the Structure of ENSO in a Tropical Coupled GCM
Publisher: American Meteorological Society
Abstract: This study examines the response of the climate simulated by the Institut Pierre Simon Laplace tropical Pacific coupled general circulation model to two changes in parameterization: an improved coupling scheme at the coast, ...
Effect of Upper- and Lower-Level Baroclinicity on the Persistence of the Leading Mode of Midlatitude Jet Variability
Publisher: American Meteorological Society
Abstract: The sensitivity of the variability of an eddy-driven jet to the upper- and lower-level baroclinicity of the mean state is analyzed using a three-level quasigeostrophic model on the sphere. The model is forced by a relaxation ...