Search Results

You are looking at 31 - 40 of 16,873 items for :

  • Planetary atmospheres x
  • All content x
Clear All
Takeshi Kuroda, Alexander S. Medvedev, Erdal Yiğit, and Paul Hartogh

1. Introduction Internal gravity waves (GWs) are an important mechanism of transporting energy and momentum between atmospheric layers in stably stratified planetary atmospheres. Their essential role has widely been recognized in the terrestrial middle atmosphere ( Fritts and Alexander 2003 ) and thermosphere [see the recent review by Yiğit and Medvedev (2015) ]. There are numerous observational and theoretical indications that GWs of tropospheric origin play a similar significant role on Mars

Full access
Kunio M. Sayanagi, Adam P. Showman, and Timothy E. Dowling

simulations. Concluding remarks are in the final section. 2. Model setup a. Numerical model We use the Explicit Planetary Isentropic Coordinate (EPIC) atmosphere model by Dowling et al. (1998) to perform our numerical experiments. The model solves the hydrostatic primitive equations with the potential temperature θ as the vertical coordinate. Because our main focus here is to study the processes that may be involved in the formation of Jupiter’s zonal jets, many of our baseline parameters represent

Full access
Germán Martínez, Francisco Valero, and Luis Vázquez

planetary boundary layer (MPBL), and specifically the Martian mixed layer (MML), is one of the least-known parts of the Martian atmosphere. This is so, among other minor aspects, because of (i) the lack of in situ data covering the MML, (ii) some specific Martian features such as the atmospheric dust load, and (iii) its own intrinsic turbulent nature. Nevertheless, its understanding becomes quite important for several reasons. First, it is the place through which current and future robotic and manned

Full access
Brian F. Farrell and Petros J. Ioannou

in nonrotating systems ( Plumb and McEwan 1978 ) suggest that the planetary vorticity gradient may not be essential for the maintenance of turbulent jets. In this paper we study the structure and dynamics of jets in turbulence by joining the equation governing the stochastically forced perturbation field with the equation for the zonal mean to form a coupled wave–mean flow evolution system. This nonlinear coupled equation system is the basic tool in stochastic structural stability theory (SSST

Full access
Tom Humphreys and Philip S. Marcus

areas of the cyclones and anticyclones differ, is that it sheds filaments to both sides of the street. Assuming that the clouds are tracers of potential vorticity, this signature shedding has been observed for the streets at 40° and 33°S. For example, Fig. 2 shows cyclones shedding filaments to both sides of their respective streets. Acknowledgments We thank the NASA Planetary Atmospheres Program (NNG06GA09G) for support. Computations were run at the San Diego Supercomputer Center (NPACI

Full access
Marvin A. Geller and Jordan C. Alpert

JUNE 1980 MARVIN A. GELLER AND JORDAN C. ALPERT 1197Planetary Wave Coupling between the Troposphere and the Middle Atmosphere as a Possible Sun-Weather Mechanism MARVIN A. GELLER AND JORDAN C. ALPERTRosensriel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL 33149 (Manuscript received 28 November 1979, in final form 11 February 1980)ABSTRACTThe possibility of planetary wave coupling between the troposphere and solar-induced alterations inthe upper

Full access
J. E. McDonald

76 JOURNAL OF THE ATMOSPHERIC SCIENCESOn a Criterion Governing the Mode of Cloud Formation in Planetary Atmospheres~ J. E. MCDONALDInstitute of Atmospheric Physics, The U*ffversity of Arisona(Manuscript received 3 December 1962, in revised form 21 October 1963)ABSTRACT Condensation in vertically moving planetary atmospheric gases containing small quantities of any condensable vapor will occur in updrafts only if the latent heat of the vapor is

Full access
Nicholas J. Lutsko

Hoerling 1993 ; Ting 1996 ; Hoerling et al. 1997 ). In a similar setting, studies of the Madden–Julian oscillation (MJO) have often focused on the way it is driven by surface latent heat flux anomalies, and contemporary theories for the dynamics of the MJO are built on older theories for the atmosphere’s response to stationary tropical heat sources ( Biello et al. 2007 ; Arnold et al. 2012 ; Sobel and Maloney 2012 ; Yang and Ingersoll 2014 ; Adames and Kim 2016 ). Finally, the planetary community

Open access
H. L. Welsh

particular emphasis on those properties which may be of importance in studies of planetary atmospheres containing hydrogen and helium. The structures of the fundamental and overtone absorptions of hydrogen are explained in some detail, and a possible explanation forthe frequency discrepancy of the planetary S3 (0) and S4 (0) features is given. Our present knowledge of theshape of the high frequency wing in induced absorption is reviewed.1. Introduction Two types of spectra have been used to

Full access
Peili Wu

3590 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 50, No. 21Nonlinear Resonance and Instability of Planetary Waves and Low-Frequency Variability in the Atmosphere PEILI WU*Department of Physics, Imperial College, London, United Kingdom(Manuscript received 26 October 1992, in final form 5 April 1993)ABSTRACT It is demonstrated in this work that linearly unstable planetary

Full access