Homopause Control by Gravity Wave Breaking
in the Planetary Atmospheres
Manabu D. Yamanaka
Radio Atmospheric Science Center, Kyoto University,
Uji, Kyoto 611, Japan
Advances in Space Research ,
Vol. 15 , No.4, pp.(4)47-(4)50.
Paper No. C.1-S.2.03 presented at a symposium entitled
``Atmospheres of Venus and Mars''
in the 29th COSPAR Plenary Meeting,
the World Space Congress,
Washington D.C., USA,
28 August-5 September 1992.
First draft: February, 1992;
Submitted: August 1993,
Accepted: September 1993
Published: April, 1995
ABSTRACT ,
CONTENTS ,
CORRECTIONS ,
FIGURES ,
REFERENCES ,
CITATIONS
Abstract
Wavebreaking turbulence induced by internal gravity waves which exist
commonly in the planetary atmospheres plays an essentially important role
in generation and maintenance of the homospheres.
It is assumed from observations on the Earth that
the scale height of vertical distribution of the vertical wavenumber
is 34/7 times as large as the density scale height $H$,
and that the intrinsic frequency is given by three times the magnitude of
an effective Coriolis paramerter $|f|$.
Then the number density at the homopause level is expressed by a universal
function of a non-dimensional parameter $b H / |f|$,
where $b$ is the collision parameter.
Observed values of $b H / |f|$ for many planets are rather similar,
and the homopause levels are controlled at number densities
$\sim 10^{18 \pm 1}$ m$^{-3}$ on those planets.
Contents
- Introduction
- Quasi-Monochromatic Field of Internal Gravity Waves
- Eddy Diffusivity due to Wavebreaking Turbulence
- Control of Homopause Level
- Conclusion
Corrections and Additional Remarks
(Nothing at present)
List of Table and Figures
- Table 1.
Non-dimensional parameter $b H / | f |$ and observed value
of $n_{\mbox{homopause}}$ for each planet.
Values of $b$ and $H$ are calculated for the infrared emission black-body
temperature.
- Fig. 1.
Schematic log-log diagram of the eddy diffusivity $K$ and
the molecular diffusivity $\nu$ as functions of number density
$\overline{n}$.
See text for details.
- Fig. 2.
Number density ($n_{\mbox{homopause}}$) at the homopause
as a function of $b H / |f|$.
See text for details.
References
(Updated after publication)
Hodges, 1969: J. Geophys. Res. , 74 , 4087.
Leovy, 1982: Icarus , 50 , 311.
Lindzen, 1981: J. Geophys. Res. , 86 , 9707.
Yamanaka, 1990: Adv. Space Res. , 10 (10), 185.
Yamanaka, 1992a: Adv. Space Res. , 12 (10), 181.
Yamanaka, 1992b: Adv. Space Res. , 12 (10), 215.
Yamanaka and Fukao, 1994:
J. Atmos. Terr. Phys. , 56 , 1375.
Citations by Subsequent Papers
(Under construction !!!!!)
List of Original Papers
by M. D. Yamanaka
Bibliography
by any authors
M. D. YAMANAKA homepage (English)
E-mail : yamanaka@kurasc.kyoto-u.ac.jp