A simulated spectrum of convectively generated gravity waves

propagation from the tropopause to the mesopause and effects on the middle atmosphere

Publisher: National Aeronautics and Space Administration, Publisher: National Technical Information Service, distributor in [Washington, DC, Springfield, Va

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Edition Notes

Other titlesPropagation from the tropopause to the mesopause and effects on the middle atmosphere.
StatementM. Joan Alexander.
Series[NASA contractor report] -- NASA-CR-205123., NASA contractor report -- NASA CR-205123.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL17593330M

  Spontaneous inertia–gravity wave emission in the differentially heated rotating annulus experiment - Volume - Steffen Hien, Joran Rolland, Sebastian Borchert, Lena Schoon, Christoph Zülicke, Ulrich AchatzCited by: 4. Gravitational waves released in the wake of the Big Bang would have left a mark on the cosmic microwave background, or CMB. This radiation fills the universe and is a relic from the moment light. Numerical Simulations of a Gravity Wave Event over CCOPE. Part II: Waves Generated by an Orographic Density Current FUQING ZHANG AND STEVEN E. KOCH Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina (Manuscript received 3 March , in final form 26 August ) ABSTRACT. mountain waves as a source of secondary gravity waves in the lower atmosphere and demonstrated that the secondary waves could become ducted by the thermal and wind structure of the stratosphere. Zhou et al. [] studied the generation of secondary waves for breaking of a broadband packet; generated waves were attributed to.

waves propagate a great distance westward. Zonal propagation is asymmetric due to Doppler shifting by the easterly flow. Trajectories of internal gravity wave packets generated by deep convection at S, E at 00 UTC on 1 January SENSITIVITY OF SIMULATED CONVECTIVELY COUPLED KELVIN WAVES TO PHYSICS SCHEMES AND RESOLUTION WITH AN IDEALIZED TROPICAL CHANNEL 1 - Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 2 - NOAA Earth System Research Laboratory, CIRES/University of Colorado, Boulder, CO 1. MOTIVATION AND BACKGROUND: THE CCKWs 2.   A new book chronicles the year odyssey that culminated in the first direct detection of gravitational waves. The book sets aside the science to focus on . Comparison of gravity wave temperature variances from ray-based spectral parameterization of convective gravity wave drag with AIRS observations Hyun-Joo Choi,1 Hye-Yeong Chun,1 Jie Gong,2 and Dong L. Wu2,3 Received 20 September ; revised 28 December ; accepted 6 January ; published 8 March

  The global distribution of vertical velocity was calculated collocating W from the 7 km G5NR output to 1° (~ km) horizontal resolution (except for the validation studies, for which Cited by: Structure of middle atmosphere du dt −fv + 1 ρ ∂p ∂x = X steady state, zonal mean: ⇒ −fv = X X by planetary waves and gravity waves Decelleration of westerlies induces poleward circulation ECMWF, 2 September – p. 2.   A model simulation illustrates how gravity waves kicked off by a cyclone east of Australia build as they travel toward space. The simulation was created using a high-resolution version of the. S. K. Dhaka et al.: Gravity waves generated in a convective and a non-convective environment data above 20km are not explored much at a fine time and height resolution to provide wave characteristics. Fritts and Alexander () had reviewed the status of the .

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Get this from a library. A simulated spectrum of convectively generated gravity waves: propagation from the tropopause to the mesopause and effects on the middle atmosphere. [M Joan Alexander; United States. National Aeronautics and Space Administration.].

wavelength waves are important. In a study of gravity waves generated in a cloud resolving numerical model, Beres et al. () showed that although the maximum gravity wave re-sponse in the stratosphere to numerically simulated tropical convection generally has a vertical wavelength about equal.

Convectively–generated gravity waves are an unresolved process in global models. However, parameterization of their effects is difficult because the parameterized wave spectrum must be linked to. tively generated gravity waves that break at their critical levels and transfer momentum to the mean flow.

In a modeling study, Alexander and Holton (, hereafter AH97) estimated that small-scale convectively gener-ated gravity waves could provide up to 25% of the forc-ing required to drive the QBO. Similar estimates have. Convectively generated mesoscale gravity waves simulated throughout the middle atmosphere Convectively generated mesoscale gravity waves simulated throughout the middle atmosphere Horinouchi, Takeshi; Nakamura, Takuji; Kosaka, Jun‐ichi 1.

Introduction It is widely accepted that tropospheric cumulus convection excites upward propagating. eterizations of convectively forced gravity waves. Introduction It has been recognized that vertically propagating gravity waves generated by various tropospheric sources (orography, convection, fronts, geostrophic ad-justment, and shear instability) can deposit their mo-mentum to the large-scale flow in.

The momentum flux of convectively forced internal gravity waves is calculated using explicitly resolved model-simulated gravity wave data. The momentum flux in a control simulation with nonlinearity and cloud microphysical processes is compared with that in quasi-linear dry simulations with either diabatic forcing or nonlinear by: 6.

Recently, convectively generated internal gravity waves and their effects on the large-scale flow have been studied using observational data (Pfister et al.

) and cloud-resolving models. 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.

Recently, Horinouchi et al. (; referred to as HNK02 hereinafter) conducted the first three-dimensional numerical simulation with a mesoscale meteorological model with cloud microphysics extending from the surface to km in order to study the convectively generated gravity waves from their generation to dissipation.

In their simulation Cited by: The gravity wave was manifested by a surface pressure dip and surface wind shift propagating westward away from the early convection. The pressure dip propagated at a speed of >30 m s −1, which is comparable with that in previous observational studies of convectively generated gravity waves.

A special focus is on the initiation of a deep Cited by: 9. The spectral characteristics of the simulated gravity waves are presented in section 7.

Finally, the main results of this study are discussed and summarized in section 8. Model and Data Description [19] WRF version is used for this study [Skamarock et al., ]. All simulations are performed using the Betts‐Miller‐Janjic (BMJ Cited by: The simulation generated vertically-propagating gravity waves that travel away from the storm, as seen in Fig.

The simulated displacement of the isentropes ranged up to several hundred meters, as has been observed by Pfister et al. The waves generate momentum flux that propagates into the stratosphere as shown by Fig. Thunderstorms are known to produce turbulence. Such turbulence is commonly referred to as convectively induced turbulence or CIT, and can be hazardous to aviation.

Although this turbulence can occur both within and outside the convection, out-of-cloud CIT is particularly hazardous, since it occurs in clear air and cannot be seen by eye or onboard radar. Furthermore, due to its small scale Cited by: 2. T.P. Lane, in Encyclopedia of Atmospheric Sciences (Second Edition), Impacts.

Gravity waves generated by convection have important impacts on the surrounding atmosphere. As described above, convective gravity waves in the troposphere can influence the morphology and longevity of convective systems and thereby play key roles in the dynamics of moist and dry convection.

A simulated spectrum of convectively generated gravity waves: Propagation from the tropopause to the mesopause and effects in the middle atmosphere, J.

Geophys. Res., Cited by: 1. Clear signals of gravity waves generated by TCs have been identified by numerous observations [16,17,18,19] and simulated successfully using mesoscale models [20,21,22,23,24].

These studies showed that the TC-generated waves have wide spatiotemporal scales, with horizontal wavelengths of 10– km and periods of 10 min– : Yuan Wang, Lifeng Zhang, Jun Peng, Yun Zhang, Tongfeng Wei.

unprecedented investigation of the whole gravity wave spectrum. First, a case study of gravity waves generated by a developing cyclone, Tropical Storm Gelane (February ), is carried out using observations complemented by numerical simulations with the Weather Research and Forecast model, with a resolution down to 1 km.

Distributions of. flux spectrum of convectively forced internal gravity waves using a nondimensional numerical model (NDM) in a two-dimensional framework. In NDM, the nonlinear forcing is represented by nonlinear advection terms multiplied by the nonlinearity factor (NF) of the thermally induced internal gravity waves for a given specified diabatic forcing.

Abstract. The emission of internal gravity waves from a layer of dry convection embedded within a stable atmosphere with static stability and zonal winds varying in height is calc. Gravity waves exist in all types of geophysical fluids, such as lakes, oceans, and atmospheres.

They play an important role in redistributing energy at disturbances, such as mountains or seamounts and they are routinely studied in meteorology and oceanography, particularly simulation models, atmospheric weather models, turbulence, air pollution, and climate research.5/5(2).

convection and gravity waves develop more slowly, the waves propagate in more oblique directions, and the wave amplitude reaches maximum around minutes.

Snapshot are shown in Fig. 5, indicating that shorter wavelength waves are generated in more oblique directions.

The two. We extend the Chun‐Baik parameterization of convectively forced stationary gravity‐wave drag by adding a set of discrete nonzero phase speeds to incorporate the effects of nonstationary gravity waves Cited by: 4.

convectively gravity waves (not shown). The waves propagate to the right at phase speeds of about 16 m s-1, and are composed of smaller-scale cloud clusters that propagate to the left.

As with previous CRM work by Grabowski and Moncrieff (), we find that the structures and phase speed of the simulated waves strongly resemble observations of. Internal gravity waves generated by convective plumes Group ; Schott, Visbeck & Fischer ).

Upon impacting the stable layer below the mixed layer, deep convective plumes could cause the generation of internal gravity waves that transport momentum from the mixed layer to the deep ocean thereby locally affecting mixing in the deep Size: KB. About Cookies, including instructions on how to turn off cookies if you wish to do so.

By continuing to browse this site you agree to us using cookies as described in. @article{osti_, title = {The Role of Gravity Waves in the Formation and Organization of Clouds during TWPICE}, author = {Reeder, Michael J.

and Lane, Todd P. and Hankinson, Mai Chi Nguyen}, abstractNote = {All convective clouds emit gravity waves. While it is certain that convectively-generated waves play important parts in determining the climate, their precise roles remain uncertain Author: Michael J.

Reeder, Todd P. Lane, Mai Chi Nguyen Hankinson. These gravity waves are partially responsible for the thermal's loss of energy (Stull, ), and eventual demise. Gravity waves generated by (moist) convection are receiving increasing attention, primarily due to their role in the momentum budget of the middle atmosphere (Fritts and Alexander, ; Kim et Cited by: Lamb waves generated in numerical simulations of con-vective storms and suggest possible ways of detecting them.

The role of gravity waves in a two-dimensional sim-ulation of a cloud has been investigated by Bretherton and Smolarkiewicz (). They found that the spread-ing gravity waves adjusted the environmental buoyancy.

In fluid dynamics, gravity waves are waves generated in a fluid medium or at the interface between two media when the force of gravity or buoyancy tries to restore equilibrium. An example of such an interface is that between the atmosphere and the ocean, which gives rise to wind waves. A gravity wave results when fluid is displaced from a position of equilibrium.

Results indicate that shear (or the obstacle) effect is a more efficient generator of gravity waves than is the pure thermal forcing. The simulations show that the gravity waves initially forced by the boundary layer eddies lead to a feedback mechanism that acts to organize the boundary layer eddies and the cumulus by: 56 convectively-coupled equatorial waves (CCEWs) and the tropical lower stratospheric 57 Quasi-Biennial Oscillation (QBO) (e.g.: Boville and Randel [], Giorgetta et al.

[]). 58 In particular, Mixed-Rossby gravity waves and equatorial Kelvin waves are crucial to the 59 driving of the QBO. These waves have vertical wavelengths that range File Size: 7MB.Abstract [1] An advantage of examining atmospheric gravity waves using high vertical-resolution radiosonde data over other measurement techniques is that horizontal wind, temperature, and vertical ascent rate can be measured directly.

This allows the kinetic, potential, and vertical velocity fluctuation energies to be derived independently. Each of these gravity wave energies is shown to have.