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Paul J. Roebber

; Anderson 1995 ; Luo and Chen 2006 ; Woollings et al. 2008 ; and many others). Additional research (e.g., Colucci 1987 , 2001 ) suggests that blocking onset may depend on the phasing between features on the planetary and synoptic scales. Colucci and Alberta (1996) further investigate the relationship between cyclogenesis and blocking and find some association between cyclone developments of various intensities and block onset but that the relationship is not sufficient to develop an empirical

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Gabriel Wolf and Volkmar Wirth

to only use the synoptic- and smaller-scale part of the wind field for the semigeostrophic coordinate transformation. The rationale for this approach is that the quasi-stationary planetary waves can be considered as part of the background flow, which should not be included into the coordinate transformation. More specifically we use u g ([ s 1 , s 2 ]) and υ g ([ s 1 , s 2 ]) instead of u g and υ g in the semigeostrophic coordinate transformation in (9) and (10) , where the notation

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RICHARD D. LINDZEN

Richard D. Lindzen441PLANETARY WAVES ON BETA-PLANES RICHARD D. LINDZENNational Center for Atmospheric Research, Boulder, Colo.ABSTRACTThe problem of linearized oscillations of the gaseous envelope of a rotating sphere (with periods in excess of a.day) is considered using the @-plane approximation. Two particular @-planes are used-one centered at the equator,the other at a middle latitude. Both forced and free oscillations are considered. With both planes it is possibleto approximate

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Harald Lejenäs and Roland A. Madden

DECEMBER 1992 LEJEN,~S AND MADDEN 2821Traveling Planetary-Scale Waves and Blocking HARALD LEJEN~,SDepartment of Meteorology, * Stockholm University, Stockholm, Sweden ROLAND A. MADDENNational Center for Atmospheric Research, t Boulder, Colorado(Manuscript received 2 January 1992, in final form 23 March 1992)ABSTRACT The possible relation between blocking-type flow patterns in the

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Kevin E. Trenberth

1378 MONTHLY WEATHER REVIEW VOLUME 108Planetary Waves at 500 mb in the Southern Hemisphere KEVIN E. TRENBERTHLaboratory for Atmospheric Research, University of Illinois, Urbana 61801(Manuscript received 22 November 1979, in final form 3 April 1980) ABSTRACT The zonally asymmetric c~mponent of the 500 mb flow in the Southern Hemisphere has been analyzedinto wavenumber

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RAYMOND J. DELAND and YEONG-JER LIN

January 1967Raymond J. Deland and Yeong-Jer Lin21ON THE MOVEMENT AND PREDICTION OF TRAVELING PLANETARY-SCALE WAVESRAYMOND J. DELAND AND YEONG-JER LINNew York University,* Bronx, N.Y.ABSTRACT Fluctuations of the planetary-scale waves, represented by spherical harmonics of the 500-mb. geopotentialfield, arc statistically analyzed. A study is made of the prediction of these fluctuat,ions from previous changes andusing the non-divergent spherical vorticity equation.1. INTRODUCTIONWhen numerical

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RAYMOND J. DELAND

Analysis of Nimbus 3 SIRS Radiance Data:Traveling Planetary-Scale Wavesin the Stratospheric Temperature Field'RAYMOND J. DELAND-Department of Meteorology and Oceanography,New York University, New York, N.Y.ABSTRACT-Zonal harmonics of the radiances measuredby thr three central channels of the SIRS instrument onNimbus 3, representing vertically averaged temperaturesin the lower and middle stratosphere, were computed. Thetraveling components of the lowest zonal w'ave numberswere estimated by ' the

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Sonja Gisinger, Andreas Dörnbrack, Vivien Matthias, James D. Doyle, Stephen D. Eckermann, Benedikt Ehard, Lars Hoffmann, Bernd Kaifler, Christopher G. Kruse, and Markus Rapp

information about the various datasets used in this study. In section 3 , we discuss specific tropospheric flow regimes and forcing conditions during DEEPWAVE. Section 4 is devoted to the tropopause layer. The stratospheric and mesospheric wind and thermal conditions providing the ambient atmospheric profiles for deep propagating gravity waves are described in section 5 . There, planetary wave activity and its impact on the location of the PNJ and the polar vortex are discussed. Special attention is

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RAYMOND J. DELAND and KEITH W. JOHNSON

12MONTHLY WEATHER REVIEWVol. 96, No. 1A STATISTICAL STUDY OF THE VERTICAL STRUCTURE OF TRAVELINGPLANETARY-SCALE WAVESRaymond J. Deland and Keith W. Johnson New York University: Bronx, N.Y.ABSTUACT The vertical structure of traveling planetary-scale waves is investigated using spherical harmonics of the ~eo-potential field nt levels from 1000 mb. to 10 mh., obtained from ESSA analyses. Fluctuations of the large-scale har-monics arc analyzed using vector regression methods. Westward

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E. Kirkwood and J. Derome

OCXOBER 1977 E. K I R K W O O D A N D J. D E R O M E 1239Some Effects of the Upper Boundary Condition and Vertical' Resolution on Modeling Forced Stationary Planetary Waves~ E. KIRKWOOD~ AND J. D~ao~ Department of Meteorology, McGill University, Montreal, Quebec, Canada H3A 2K6 (Manuscript received 24 March 1977, in final form 1 July 1977) ABSTRACT

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