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RISThe Role of the Divergent Circulation for Large-Scale Eddy Momentum Transport in the Tropics. Part II: Dynamical Determinants of the Momentum Flux
Publisher: American Meteorological Society
Abstract: AbstractThis paper investigates the coupling between the rotational and divergent circulations aiming to explain the observations that show that the tropical eddy momentum flux is due to correlations between divergent eddy ...
The interannual variability of the tropical divergence tilt and its connection with the extratropical circulation
Publisher: American Meteorological Society
Abstract: Previous theoretical work has suggested that the strength of the divergent eddy momentum flux in the deep tropics, due to correlations between rotational zonal velocities and divergent meridional velocities, increases with ...
On the Sensitivity of Zonal-Index Persistence to Friction
Publisher: American Meteorological Society
Abstract: riction is an important parameter in atmospheric modeling that may affect internal variability in a number of ways. It directly damps the annular-mode variability, but it also helps to maintain it through baroclinic ...
Updraft/Downdraft Constraints for Moist Baroclinic Modes and Their Implications for the Short-Wave Cutoff and Maximum Growth Rate
Publisher: American Meteorological Society
Abstract: This paper examines the dynamics of moist baroclinic modes, based on the idealized model of moist baroclinic instability devised by Emanuel et al. These authors found that the finite static stability along the downdraft ...
The Relation between Baroclinic Adjustment and Turbulent Diffusion in the Two-Layer Model
Publisher: American Meteorological Society
Abstract: Baroclinic adjustment and turbulent diffusion are two popular paradigms used to describe the eddy?mean flow closure in the two-layer model, with very different implications for the criticality of the system. Baroclinic ...
The Role of the Divergent Circulation for Large-Scale Eddy Momentum Transport in the Tropics. Part I: Observations
Publisher: American Meteorological Society
Abstract: AbstractThis work investigates the role played by the divergent circulation for meridional eddy momentum transport in the tropical atmosphere. It is shown that the eddy momentum flux in the deep tropics arises primarily ...
The Sensitivity of the Isentropic Slope in a Primitive Equation Dry Model
Publisher: American Meteorological Society
Abstract: This paper discusses the sensitivity of the isentropic slope in a primitive equation dry model forced with Newtonian cooling when the heating is varied. This is done in two different ways, changing either the radiative ...
The Tropospheric Jet Response to Prescribed Zonal Forcing in an Idealized Atmospheric Model
Publisher: American Meteorological Society
Abstract: This paper explores the tropospheric jet shift to a prescribed zonal torque in an idealized dry atmospheric model with high stratospheric resolution. The jet moves in opposite directions for torques on the jet?s equatorward ...
Intraseasonal Variability of the Zonal-Mean Extratropical Tropopause: The Role of Changes in Polar Vortex Strength and Upper-Troposphere Wave Breaking
Publisher: American Meteorological Society
Abstract: principal component analysis of the Northern Hemisphere extratropical zonal-mean tropopause variability at intraseasonal time scales is presented in this work. Wavy deformations of the tropopause dominate this variability ...
Dynamics of Midlatitude Tropopause Height in an Idealized Model
Publisher: American Meteorological Society
Abstract: his paper investigates the factors that determine the equilibrium state, and in particular the height and structure of the tropopause, in an idealized primitive equation model forced by Newtonian cooling in which the eddies ...