نتایج جستجو برای: convective

تعداد نتایج: 16687  

2005
James E. Evans

This paper investigates methods for quantifying convective weather delay reduction benefits for weather/ATM systems and recommends approaches for future assessments. This topic is particularly important at this time because: 1. Convective weather delays continue to be a dominant factor in the overall National Airspace System (NAS) delays, and 2. Benefits quantification and NAS performance asses...

2004
P. Lesaffre Ph. Podsiadlowski C. A. Tout

One possible fate of an accreting white dwarf is explosion in a type Ia supernova. However, the route to the thermonuclear runaway has always been uncertain owing to the lack of a convective model consistent with the Urca process. We derive a formalism for convective motions involving two radial flows. This formalism provides a framework for convective models that guarantees self-consistency fo...

2010
Melody Avery Cynthia Twohy David McCabe Joanna Joiner Kurt Severance Eliot Atlas Donald Blake T. P. Bui John Crounse Jack Dibb Glenn Diskin Paul Lawson Matthew McGill David Rogers Glen Sachse Eric Scheuer Anne M. Thompson Charles Trepte Paul Wennberg Jerald Ziemke

[1] During the Tropical Composition, Clouds and Climate Coupling (TC4) experiment that occurred in July and August of 2007, extensive sampling of active convection in the ITCZ region near Central America was performed from multiple aircraft and satellite sensors. As part of a sampling strategy designed to study cloud processes, the NASA ER‐2, WB‐57 and DC‐8 flew in stacked “racetrack patterns” ...

Journal: :Science 2006
Jean-François Donati Thierry Forveille Andrew Collier Cameron John R Barnes Xavier Delfosse Moira M Jardine Jeff A Valenti

Understanding how cool stars produce magnetic fields within their interiors is crucial for predicting the impact of such fields, such as the activity cycle of the Sun. In this respect, studying fully convective stars enables us to investigate the role of convective zones in magnetic field generation. We produced a magnetic map of a rapidly rotating, very-low-mass, fully convective dwarf through...

1999
OLIVIER PAULUIS ISAAC M. HELD

The frictional dissipation in the shear zone surrounding falling hydrometeors is estimated to be 2–4 W m22 in the Tropics. A numerical model of radiative–convective equilibrium with resolved three-dimensional moist convection confirms this estimate and shows that the precipitation-related dissipation is much larger than the dissipation associated with the turbulent energy cascade from the conve...

2008
Alexander Stökl

Context. In spite of all the advances in multi-dimensional hydrodynamics, investigations of stellar evolution and stellar pulsations still depend on one-dimensional computations. This paper devises an alternative to the mixing-length theory or turbulence models usually adopted in modelling convective transport in such studies. Aims. The present work attempts to develop a time-dependent descript...

2016
Jessica Vial Sandrine Bony Jean-Louis Dufresne Romain Roehrig

Several studies have pointed out the dependence of low-cloud feedbacks on the strength of the lower-tropospheric convective mixing. By analyzing a series of single-column model experiments run by a climate model using two different convective parametrizations, this study elucidates the physical mechanisms through which marine boundary-layer clouds depend on this mixing in the present-day climat...

2006
Hans-Günter Ludwig Peter H. Hauschildt

We constructed hydrodynamical model atmospheres for mid M-type main-, as well as pre-main-sequence (PMS) objects. Despite the complex chemistry encountered in these cool atmospheres a reasonably accurate representation of the radiative transfer is possible, even in the context of time-dependent and three-dimensional models. The models provide detailed information about the morphology of M-type ...

2005
J. Stein J. C. Wheeler

Consideration of the role of the convective flux in the thermodymics of the convective Urca neutrino loss process in degenerate, convective, quasi-static, carbon-burning cores shows that the convective Urca process slows down the con-vective current around the Urca-shell, but, unlike the " thermal " Urca process, does not reduce the entropy or temperature for a given convective volume. Here we ...

2005
Karanam Kishore Kumar A. R. Jain Narayana Rao

Several campaigns have been carried out to study the convective systems over Gadanki (13.5 N, 79.2 E), a tropical station in India, using VHF and UHF radars. The height-time sections of several convective systems are investigated in detail to study reflectivity, turbulence and vertical velocity structure. Structure and dynamics of the convective systems are the main objectives of these campaign...

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