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HAMILTON, KEVIN (2011)
Publisher: Co-Action Publishing
Journal: Tellus A
Languages: English
Types: Article
Subjects:

Classified by OpenAIRE into

arxiv: Physics::Atmospheric and Oceanic Physics, Physics::Geophysics
Atmospheric simulations produced by the Canadian Climate Centre general circulation model (GCM) were examined to detect Rossby normal modes such as the familiar “5-day” and “16-day” waves. Space-time spectral analysis of the simulated geopotential fields showed a concentration of power near the scales and frequencies predicted for the two gravest Rossby modes of both zonal wavenumbers one and two. By filtering the time series of simulated geopotential and wind fields in narrow bands around these spectral peaks, the vertical and meridional structures of these prominent oscillations were revealed. These structures were in good agreement with those theoretically predicted for the Rossby normal modes. The overall amplitudes of these modes appear to be realistic and even the day-to-day evolution of the modal amplitudes in the GCM is similar to that observed in the real atmosphere. A more complicated picture emerged when the same analysis was applied to the lower frequency “16-day” wave (i.e., the second gravest symmetric Rossby mode). The spectra produced from the GCM fields failed to reproduce the peak in power in westward propagating zonal wavenumber one variance near 15–20 days that has been observed by Speth and Madden (1983). Examination of the geopotential field after it had been filtered to include only low frequency westward-propagating zonal wavenumber one variance did reveal at least one isolated episode when the meridional structure displayed some resemblance to the second gravest symmetric Rossby mode of theory. However, amplitudes are much stronger in the winter hemisphere than in the summer. A similar hemispheric asymmetry in the “16-day” wave has been found in observations. The strength of the gravest symmetric zonal wavenumber one Rossby mode (“5-day” wave) was examined in a series of GCM simulations performed with climatological sea surface temperatures and in simulations that had anomalously warm sea surface temperatures imposed in the tropical Pacific. There is a clear tendency for the 5-day wave to be stronger in the simulations with warm ocean temperatures, in agreement with observations of the interannual variability of this mode in real data. The excellent simulation of the gravest Rossby modes in the model suggests that the forcing and dissipation mechanisms for the modes in the GCM may also be realistic. An attempt was made to examine the forcing and dissipation of the modes in the model through a diagnostic study of the energetics of the simulated fields. The interaction with topography acts as a net sink for the modal energy. The dissipation arising from the parameterized mechanical friction in the GCM is much more important for these modes than that due to radiative heating and cooling.DOI: 10.1111/j.1600-0870.1987.tb00320.x
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    • free Rossby waves during January 1979. J . Atmos. Sci. 42, 2121-2141.
    • Desmarais, J. G . and Derome, J. 1978. Some effects of vertical resolution on modelling forced planetary waves with a time-dependent model. AtmosphereOcean 16, 212-225.
    • Dikii, L. 1965. The terrestrial atmosphere as an oscillating system. Iza. Acad. Sci. USSR Atmos. Oceanic Phys., Engl. trans., 1, 469489.
    • Dikki, L. and Golitsyn, G . 1968. Calculation of Rossby wave velocities of the earth's atmosphere. Tellus 20, 314-31 7.
    • Eliasen, E. and Machenhauer, B. 1965. A study of the fluctuations of atmospheric planetary flow patterns represented by spherical harmonics. Tellus 17, 220- 238.
    • Eliasen, E. and Machenhauer, B. 1969.On the observed large-scale atmospheric wave motions. Tellus 21, 149-1 65.
    • Garcia, R. R. and Geisler, J. E. 1981. Stochastic forcing of small amplitude oscillations in the stratosphere. J . Atmos. Sci. 38, 2187-2197.
    • Geisler, J. and Dickinson, R. E. 1976. The five-day wave on the sphere with realistic zonal winds. J . Atmos. Sci. 33, 632-641.
    • Hamilton, K. 1984. Evidence for a normal mode Kelvin wave in the atmosphere. J . Meteorol. SOC.Japan 62, 308-3 1 I .
    • Hamilton, K. 1985. A possible relationship between tropical Ocean temperatures and the observed amplitude of the atmospheric (1,l) Rossby normal mode. J . Geophys. Res. 90,8071-8074.
    • Hamilton, K. and Garcia, R. R. 1986. Theory and observations of short period atmospheric normal modes. J . Geophys. Res. 91, 11867-11875.
    • Haurwitz, B. 1940. The motion of atmospheric disturbances on the spherical earth. J . Mar. Res. 3, 244- 267.
    • Hayashi, Y. 1971. A generalized method of resolving disturbances into progressive and retrogressive waves by space Fourier and time cross-spectral analysis. J . Meteorol. SOC.Japan 49, 125-128.
    • Hayashi, Y. 1974. Spectral analysis of tropical disturbances appearing in a GFDL general circulation model. J . Atmos. Sci. 31, 180-218.
    • Hayashi, Y. and Colder, D. G. 1983a. Transient planetary waves simulated by GFDL spectral general circulation models. I. Effects of mountains. J . Atmos. Sci.40, 941-950.
    • Hayashi, Y. and Colder, D. G. 1983b. Transient planetary waves simulated by GFDL spectral general circulation models. 11. Effects of nonlinear energy transfer. J . Atmos. Sci. 40, 951-957.
    • Hirota, I. 1978. Equatorial waves in the upper stratosphere and mesosphere in relation to the semiannual oscillation of the zonal wind. J . Atmos. Sci.35, 714- 722.
    • Hirota, I. and Hirooka, T. 1984. Normal mode Rossby waves observed in the upper stratosphere. Part I: First symmetric modes of zonal wavenumbers one and two. J . Atmos. Sci. 41, 1253-1267.
    • Hirota, 1. and Hirooka, T. 1985. Normal mode Rossby waves observed in the upper stratosphere. 11. Second antisymmetric and symmetric modes of zonal wavenumbers one and two. J . Atmos. Sci. 42, 5 3 6 548.
    • Holton, J. R. 1975. The dynamical meteorology of the stratosphere and mesosphere. Meteor. Monogr. No. 37. Amer. Meteor. Soc.,216 pp.
    • Horel, J. D. and Wallace, J . M. 1981. Planetary scale atmospheric phenomena associated with the Southem Oscillation. Mon. Wea. Reu. 109, 813-819.
    • Hunt, B. G. and Manabe, S. 1968. An investigation of the thermal tidal oscillations in the earth's atmosphere using a general circulation model. Mon. Wea. Reo. 96, 753-766.
    • Kasahara, A. 1976. Normal modes of ultralong waves in the atmosphere. Mon. Wea. Rev. 104, 669-690.
    • Lamb, H. 1932. Hydrodynamics, 6th edition. Dover, New York, 548-549.
    • Lambert, S. J. and Merilees, P. E. 1978. A study of planetary wave errors in a spectral numerical weather prediction model. Atmosphere-Ocean 16, 197-21 I .
    • Lindzen, R. S., Straus, D. M. and Katz, B. 1984. An observational study of large-scale atmospheric Rossby waves during FGGE. J . Atmos. Sci. 41, 1320- 1335.
    • Longuett-Higgins, M. S. 1968. The eigenfunctions of Laplace's Tidal Equation over a sphere. Philos. Trans. R . SOC.London A262, 51 1-607.
    • Madden, R. A . 1978. Further evidence of traveling planetary waves. J . Atmos. Sci. 35, 1605-1618.
    • Madden, R. A . 1979. Observations of large-scale travelling waves. Rev. Geophys. Space Phys. 17, 1935- 1949.
    • Madden, R. A. 1983. The effect of the interference of traveling and stationary waves on time variations of the large-scale circulation. J . Atmos. Sci. 40, 1 1 1 0 - 1125.
    • Madden, R. A. and Julian, P. 1972. Further evidence of global-scale five-day pressure waves. J . Atmos. Sci. 29, 14641469.
    • Madden, R. A . and Julian, P. 1973. Reply to comments of R. Deland. J . Atmos. Sci. 30, 935-940.
    • Matsuno, T. 1980. A trial search for minor components of lunar tides and short-period free oscillations of the atmosphere in surface pressure data. J . Meteorol. SOC. Japan 58, 281-285.
    • Pratt, R. and Wallace, J. M. 1976. Zonal propagation characteristics of large-scale fluctuations in the midlatitude troposphere. J . Atmos. Sci. 33, 1184- 1194.
    • Rasmusson, E. M. and Carpenter, T. H. 1982. Variations in tropical sea surface temperature and surface wind fields associated with the Southern Oscillation/El Nifio. Mon. Wea. Reo. 110, 354- 384.
    • Rodgers, C. D. 1976. Evidence for the five day wave in the upper stratosphere. J . Atmos. Sci. 33, 710-711.
    • Salby, M. L., 1979. On the solution of the homogeneous vertical structure problem. J . Atmos. Sci.36, 2350- 2359.
    • Salby, M. L. 1980. The influence of realistic dissipation on planetary normal structures. J . Atmos. Sci. 37, 21862199.
    • Salby, M. L. 1981a. Rossby normal modes in nonuniform background configuration, I, simple fields. J . Atmos. Sci. 38, 1803-1826.
    • Salby, M. L. 1981b. Rossby normal modes in nonuniform background configuration, 11, equinox and solstice conditions. J . Atmos. Sci. 38, 1827-1840.
    • Salby, M. L. 1984. Survey of planetary-scale traveling waves: the state of theory and observations. Reo. Geophys. Space Phys. 22, 209-236.
    • Schoeberl, M. R. and Clark, J. H. E. 1980. Resonant planetary waves in a spherical atmosphere. J . Atmos. Sci. 37, 20-28.
    • Speth, P. and Madden, R. A. 1983. Space-time spectral analysis of Northern Hemisphere geopotential heights. J. Armos. Sci.40, 1 0 8 6 1 100.
    • Tokioka, T., Yamazaki, Y. and Chiba, M 1985. Atmospheric response to the sea surface temperatures observed in early summer 1983--a numerical experiment. J . Mereorol. Soc. Japan 63, 565-588.
    • Tsay, C. 1974. Analysis of large-scale wave disturbances in the tropics simulated by an NCAR general circulation model. J . Armos. Sci. 31, 3 3 e 3 3 9 .
    • Williamson, D. L. and Dickinson, R. E. 1976. Free oscillations of the NCAR global circulation model. Mon. Wea. Rec. 104, 1372-1391.
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