Nonlinear Axially Symmetric Circulations in a Nearly Inviscid Atmosphere

Held, Isaac M.; Hou, Arthur Y.

doi:10.1175/1520-0469(1980)037<0515:nascia>2.0.co;2

Cited by 822 publications

(730 citation statements)

References 0 publications

Supporting

Mentioning

681

Contrasting

Order By: Relevance

“…This is simply an extension to a moist atmosphere of the dynamical control on free-tropospheric temperatures found in theories of axisymmetric, angular momentum conserving circulations (e.g. Held and Hou, 1980). In idealized models of monsoons, Privé and Plumb (2007b) found that zonal asymmetries introduced numerous complexities to such axisymmetric theories, but that the position of the s b peak still served to delineate the poleward boundary of the monsoon circulation, with maximum ascent and precipitation occurring just equatorward of this peak (also Privé and Plumb, 2007a).…”

Section: Assessment In a Quasi-equilibrium Frameworkmentioning

confidence: 99%

Annual intensification of the Somali jet in a quasi‐equilibrium framework: Observational composites

Boos

Emanuel

2009

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

ABSTRACT:The annual intensification of the Somali jet, which accompanies the onset of the Indian summer monsoon, is rapid compared to the evolution of the seasonal insolation forcing. Using observationally-based data sets, the dynamic and thermodynamic changes accompanying the onset of this jet are presented. The abrupt component of jet onset is shown to occur over ocean about 1000 km east of the East African highlands, and is accompanied by increases in both deep convection and baroclinic flow over the off-equatorial Arabian Sea. These abrupt changes are well separated from the core of the cross-equatorial jet, which is located over land adjacent to the East African highlands.The onset of the Somali jet and the associated monsoon are then examined in a convective quasi-equilibrium framework. Such a framework is consistent with the mean summer state, in that peak free-tropospheric temperatures are nearly collocated with peak subcloud layer entropies over the northern Bay of Bengal and adjacent coastal regions. Jet onset is accompanied by a large (O{100 W m −2 }) increase in surface enthalpy flux over the Arabian Sea that is nearly collocated with, and linearly related to, the concurrent increase in deep tropospheric ascent. At the same time, the highest subcloud entropies shift inland slightly from the Bay of Bengal, and the region of warmest free-tropospheric temperatures expands poleward. The consistency of all of these changes with a wind-evaporation feedback and several other hypothesized mechanisms of abrupt monsoon onset is discussed.

show abstract

Section: Assessment In a Quasi-equilibrium Frameworkmentioning

confidence: 99%

Annual intensification of the Somali jet in a quasi‐equilibrium framework: Observational composites

Boos

Emanuel

2009

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

show abstract

“…However, since the planetary climate crucially depends on the evolution of Rossby waves, and it is our desire to keep such evolution Earthlike, the Rossby number Ro is kept constant in the following test case, which facilitates an intercomparison with the Earth's climate. In particular, it is important for maintaining the relative latitudinal positions of zonal jet cores, which establish in sufficiently long simulations (Held and Hou, 1980). The Held-Suarez climate simulations consist of adding −k v v on the right-hand side of the horizontal momentum equations and adding −k T (T − T eq ) on the right-hand side of the thermodynamic equation.…”

Section: Held-suarez Climatementioning

confidence: 99%

A framework for testing global non‐hydrostatic models

Wedi

Smolarkiewicz

2009

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

ABSTRACT:With the emergence of non-hydrostatic global dynamical cores, an alternative testing strategy is proposed, where the planetary radius is suitably reduced to capture non-hydrostatic phenomena without incurring the computational cost of actual simulations of weather and climate at non-hydrostatic resolution. The procedure is simple and tests various aspects of the discretized hydrostatic and non-hydrostatic equations in the same setting on a sphere. Furthermore, it facilitates verification against Cartesian-domain analytic solutions and against large-eddy simulation (LES) benchmarks available for limited-area models. The proposed framework is illustrated with examples of inertia-gravity wave dynamics in linear and nonlinear regimes, including flows past idealized mountains, stratified shear flows and critical layers. Finally, an intercomparison of the Held-Suarez climate variability for reduced-size planets is presented, which provides a path for future investigations on the dynamics of convective boundary layers on a sphere. This assesses the ability to adequately capture interactions of large-scale dynamics with intermittent turbulent structures, an important aspect of future weather and climate predictions.

show abstract

“…The poleward boundary of the HC is determined by a balance between the extratropical baroclinic eddies (i.e., synoptic frontal systems) and the subsidence in the subtropics induced by radiative cooling. An earlier theoretical framework suggested that the HC would become stronger due to the increase of rainfall in its rising branch in a warmer climate (6). The width of the HC, as scaled by its height and strength (6), has thus been expected to increase.…”

mentioning

confidence: 99%

Global warming-accelerated drying in the tropics

2015

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Nonlinear Axially Symmetric Circulations in a Nearly Inviscid Atmosphere

Cited by 822 publications

References 0 publications

Annual intensification of the Somali jet in a quasi‐equilibrium framework: Observational composites

Annual intensification of the Somali jet in a quasi‐equilibrium framework: Observational composites

A framework for testing global non‐hydrostatic models

Global warming-accelerated drying in the tropics

Contact Info

Product

Resources

About