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RISResponse of the Midlatitude Jets, and of Their Variability, to Increased Greenhouse Gases in the CMIP5 Models
Publisher: American Meteorological Society
Abstract: his work documents how the midlatitude, eddy-driven jets respond to climate change using model output from phase 5 of the Coupled Model Intercomparison Project (CMIP5). The authors consider separately the North Atlantic, ...
Quantifying Isentropic Mixing Linked to Rossby Wave Breaking in a Modified Lagrangian Coordinate
Publisher: American Meteorological Society
Abstract: AbstractIsentropic mixing is an important process for the distribution of chemical constituents in the mid- to high latitudes. A modified Lagrangian framework is applied to quantify the mixing associated with two distinct ...
Dynamical Feedbacks of the Southern Annular Mode in Winter and Summer
Publisher: American Meteorological Society
Abstract: The persistence of the southern annular mode (SAM) is studied during austral winter (June?September) and summer (December?March) using observations of the three-dimensional vorticity budget. Analysis of the relative vorticity ...
Rossby Wave Scales, Propagation, and the Variability of Eddy-Driven Jets
Publisher: American Meteorological Society
Abstract: he eddy-driven jet is located in the midlatitudes, bounded on one side by the pole and often bounded on the opposite side by a strong Hadley-driven jet. This work explores how the eddy-driven jet and its variability persist ...
Barotropic Impacts of Surface Friction on Eddy Kinetic Energy and Momentum Fluxes: An Alternative to the Barotropic Governor
Publisher: American Meteorological Society
Abstract: s the surface drag is increased in a comprehensive general circulation model (GCM), the upper-level zonal winds decrease and eddy momentum flux convergence into the jet core increases. Globally averaged eddy kinetic energy ...
Dynamical Feedbacks and the Persistence of the NAO
Publisher: American Meteorological Society
Abstract: The persistence of the North Atlantic Oscillation (NAO) is studied using observations of the three-dimensional vorticity budget in the Atlantic sector. Analysis of the relative vorticity tendency equation shows that ...
Comparing the Roles of Barotropic versus Baroclinic Feedbacks in the Atmosphere’s Response to Mechanical Forcing
Publisher: American Meteorological Society
Abstract: o barotropic or baroclinic eddy feedbacks dominate the atmospheric circulation response to mechanical forcing?To address this question, barotropic torques are imposed over a range of latitudes in both an idealized general ...
The Global Distribution of Atmospheric Eddy Length Scales
Publisher: American Meteorological Society
Abstract: he correlation lengths of vorticity anomalies from temporal averages are examined in the 40-yr European Centre for Medium-Range Weather Forecasts Re-Analysis dataset. It is shown that, in the annual mean, eddies in the ...
Seasonal Sensitivity of the Northern Hemisphere Jet Streams to Arctic Temperatures on Subseasonal Time Scales
Publisher: American Meteorological Society
Abstract: AbstractNear-surface Arctic warming has been shown to impact the midlatitude jet streams through the use of carefully designed model simulations with and without Arctic sea ice loss. In this work, a Granger causality ...
CMIP5 Projections of Arctic Amplification, of the North American/North Atlantic Circulation, and of Their Relationship
Publisher: American Meteorological Society
Abstract: ecent studies have hypothesized that Arctic amplification, the enhanced warming of the Arctic region compared to the rest of the globe, will cause changes in midlatitude weather over the twenty-first century. This study ...