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3 edition of Nonstationary gravity wave forcing of the stratospheric zonal mean wind found in the catalog.

Nonstationary gravity wave forcing of the stratospheric zonal mean wind

Nonstationary gravity wave forcing of the stratospheric zonal mean wind

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  • 13 Currently reading

Published by National Aeronautics and Space Administration in [Washington, D.C .
Written in English

    Subjects:
  • Gravity waves.,
  • Tropospheric circulation.,
  • Atmosphere, Upper.,
  • Middle atmosphere.

  • Edition Notes

    StatementM.J. Alexander, K.H. Rosenlof.
    Series[NASA contractor report] -- NASA-CR-204542., NASA contractor report -- NASA CR-204542.
    ContributionsRosenlof, Karen Helper., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Paginationp. 23,465-23,474
    Number of Pages23474
    ID Numbers
    Open LibraryOL15502691M

    In addition to the orographic hotspots, the variance map in Fig. shows a broad zonal band of stratospheric gravity wave activity around 50–70 ∘ S. A pronounced maximum of gravity wave activity within this latitude band is found leeward of the Andes and the Antarctic Peninsula, extending as far as ∘ E. The origin of this broad maximum. Downward Coupling between the Stratosphere and Troposphere: The Relative Roles of Wave and Zonal Mean Processes * both on the strength of the tropospheric wave forcing and on the stratospheric mean flow itself. and the zonal wind at N (Christiansen ). The relationship between troposphericandstrato-.

    When the zonal wind decreases (but is still positive), gravity waves with high eastward phase speeds can transit the stratosphere and propagate into the mesosphere. Little eastward momentum is deposited below the mesopause because gravity waves with high eastward phase speeds (c) encounter the mesosphere with strong westward winds (u Cited by: 4. Abstract. A climatology of stratospheric gravity wave activity is presented for the ten year period from to The climatology is based on high vertical resolution radiosonde data of routine soundings from Munich (48° N, 12° E) and Stuttgart (49° N, 9° E), i.e. stations located close to the northern baseline of the Alps.

    middle latitudes is maintained by the mean wind decel-eration force associated with the breaking and/or dissi-pation of gravity waves (Lindzen ; Matsuno ). Through the downward control principle proposed by Haynes et al. (), the gravity wave force drives a global-scale meridional circulation from the summer toFile Size: 3MB. The atmospheric Kelvin wave has been widely studied due to its importance in atmospheric dynamics. Since a long-term climatological study is absent in the literature, we have employed the two-dimensional fast Fourier transform (2D-FFT) method for the year long-term reanalysis of the dataset, ERA-Interim, to investigate the properties of Kelvin waves with wavenumbers 1 .


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Nonstationary gravity wave forcing of the stratospheric zonal mean wind Download PDF EPUB FB2

The gravity-wave-driven force is accelerative (has the same sign as the mean wind) throughout most of the stratosphere above 20 km. The sense of the gravity wave forcing in the stratosphereFile Size: 1MB. The role of gravity wave forcing in the zonal mean circulation of the stratosphere is discussed.

Starting from some very simple assumptions about the momentum flux spectrum of nonstationary (non‐zero phase speed) waves at forcing levels in the troposphere, a linear model is used to calculate wave propagation through climatological zonal mean winds at solstice by: Get this from a library.

Nonstationary gravity wave forcing of the stratospheric zonal mean wind. [M Joan Alexander; Karen Helper Rosenlof; United States. National Aeronautics and. The role of gravity wave forcing in the zonal mean circulation of the stratosphere is discussed.

Starting from some very simple assumptions about the momentum flux spectrum of nonstationary (non-zero phase speed) waves at forcing levels in the troposphere, a linear model is used to calculate wave propagation through climatological zonal mean winds at solstice by: The role of gravity wave forcing in the zonal mean circulation of the stratosphere is discussed.

Abstract. A model of gravity wave propagation and mean flow effects is compared to observations. Despite the absence of any gravity wave source variations in this model, monthly mean distributions in the gravity wave-driven zonal force and temperature variance show very realistic seasonal, vertical, and geographical variations in the middle by: 7.

FIG. Gravity wave plus mean responses that result from a longitudinally symmetric monopole zonal body forcing with sy 5 20 km, sz 5 1 km, n 5 1, and s5 1 h.

For this source, tc 5 h so that aˆ. The velocity vectors at t 5 1, 3, and 12 h are shown in (a), (b. on zonal wind thresholds in the lower troposphere and in the mid-stratosphere. Our approach uses similar criteria as a model presented byDörnbrack et al.() that was used to quantify stratospheric gravity wave activity above Scan-dinavia.

However, the present model does not consider wind turning with height as we focus on southern Cited by: Filtering by a wind system 8 Change of Gravity Wave Forcing between summer and winter Filteri ng of gravity waves by stratospheric wind system: gravity wave will be UHÁHFWed or absorbed at cri tical layer.

² Eastward stratospheric jet under normal winter conditions: dominant westward propagating gravity waves in the mesosphere. Publications - Research - Field Campaigns - Vitae - Miscellaneous - Contact.

Publications: [Google Scholar Page] Vincent, R. A., and M. Alexander, Observational studies of short vertical wavelength gravity waves and interaction with QBO winds. Purchase An Introduction to Atmospheric Gravity Waves, Volume - 2nd Edition.

Print Book & E-Book. ISBN zonalwavelength of order km, the Rossby wave speed relative to the zonal flow is approximately −8 m/s. • Because the mean zonal wind is generally westerly and greater than 8 m/s, synoptic-scale Rossby waves usuall t dlly move eastward, bt tbut at a phhdase speed reltilative to the ground that is somewhat less than the mean zonal wind speedFile Size: KB.

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Nonstationary gravity wave forcing of the stratospheric zonal mean wind. On the ‘‘downward control’’ of extratropical diabatic circulations by eddy-induced mean zonal forces. [1] Gravity wave (GW) activities around the subtropical jet of the Southern winter (June) are analyzed using Atmospheric General Circulation Model outputs of TL60, in order to clarify roles of GWs in maintaining the zonal mean zonal wind.

Dominant GWs are characterized with periods of 10–24 hours relative to the ground, and with horizontal and vertical Cited by: Stratospheric circulation anomalies are caused mainly by wave forcing from the dense troposphere. Stochastic variations in the troposphere during northern hemispheric winter lead to high-frequency changes in the planetary wave flux upward into the stratosphere (Holton ).When these waves break.

This book has been cited by the following publications. This list is generated based on data provided by CrossRef. Strelnikov, Boris Szewczyk, Artur Strelnikova, Irina Latteck, Ralph Baumgarten, Gerd Lübken, Franz-Josef Rapp, Markus Fasoulas, Stefanos Löhle, Stefan Eberhart, Martin Hoppe, Ulf-Peter Dunker, Tim Friedrich, Martin Hedin, Jonas Cited by: 7.

Since wave prohibition regions gradually broaden with height due to background wind shear, as shown in Figures 5–7, stratospheric gravity waves appear in a relatively confined spectral range compared with the convective forcing for the both horizontal wavelength and the period.

Dominant horizontal wavelengths of eastward propagating waves are. The Quasi-biennial Oscillation (QBO) is a tropical, lower stratospheric, downward propagating zonal wind variation, with an average period of ~28 months.

The importance of the QBO is that it dominates the variability of the tropical lower stratospheric meteorology [Wallace, ]. The QBO is also important for seasonal forecasting, and the QBO. A model of non-stationary gravity waves in the stratosphere and comparison to observar tions, in Gravity Wave Processes: Their Parameterization in Global Climate, ed.

Hamilton, pp, Heidelberg, Springer-Verlag, Alexander, M. J., and K. Rosenlof, Nonstationary gravity wave forcing of the stratospheric zonal mean wind. by:. This is because the vertical propagation.

condition of linear internal gravity waves, in both the troposphere and stratosphere, restricts wave sources. in the horizontal wavenumber (k) and frequency (v) domain, and therefore all of the forcing cannot generate.

gravity waves that can propagate up to the stratosphere.). In Eq. (1), the zonal-mean wind tendency is de-termined by the total wave forcing (the first set of braces) and the advection term (the second set of braces).

The total wave forcing consists of the di-vergence of the resolved EP flux and the drag im-posed by parameterized GWsX. It is well known that Eq. (1) is, in general, not bal.The seasonal variation of gravity wave drag (GWD) produced by gravity wave filtering deduced by Lindzen () is in agreement with the missing force necessary to drive the Murgatroyd and Singleton circulation, that is, the force that balances the Coriolis force produced by the meridional circulation.

This evidence suggests that GWD is the main Cited by: