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Leo J. Donner and Hsiao-Lan Kuo

1 OCTOBER 1984 LEO J. DONNER AND HSIAO-LAN KUO 2849Radiative Forcing of Stationary Planetary Waves LEO J. DONNER National Center for Atmospheric Research, 1 Boulder, CO 80307 HSIAO-LAN KUO Department of the Geophysical Sciences, The University of Chicago, Chicago, IL 60637 (Manuscript received 9 January 1984, in final form 5 July 1984

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Matthew Newman, Prashant D. Sardeshmukh, and Cécile Penland

, though possible, is not a frequent occurrence in the atmosphere and cannot by itself explain the general characteristics of observed low-frequency variability on timescales of longer than 10 days. Taken together, Papers I and II suggest that the observed growth of low-frequency anomalies in the troposphere is not predominantly due to barotropic energy transfers from the ambient flow. However, these papers were concerned with the unforced problem, whereas SWB allowed some role for forcing. As they put

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Yang Zhang and Peter H. Stone

) , Cehelsky and Tung (1991) , Lindzen (1993) , and Zurita and Lindzen (2001) . Baroclinic adjustment suggested a tendency of the baroclinic eddies to homogenize the mean flow PV gradient and proposed a preferred equilibrium state as well as a strong feedback between the eddy heat fluxes and the temperature structure. In the baroclinic adjustment scenario, the eddy fluxes are sensitive to the variation of the external forcing (i.e., seasonal forcing and climate change) but the structure of the mean state

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James R. Holton

942 JOURNAL OF THE ATMOSPHERIC SCIENCES VO~-UME31Forcing of Mean Flows by Stationary Waves~ J~KES R. HOLTON2Dept. of Atmospheric Sciences, University of Washington, Seattle 98195(Manuscript received 1 February 1974)ABSTRACT It is shown that in the absence of dissipation or of critical levels where the mean zonal flow vanishes thefordng of the mean zonal flow by linearized, quasi-static, stationary

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Hye-Yeong Chun, Hyun-Joo Choi, and In-Sun Song

forced gravity waves can contribute to momentum forcing required to drive the quasi-biennial oscillation and semiannual oscillation ( Alexander and Holton 1997 ; Sassi and Garcia 1997 ). There are several numerical modeling studies of convectively forced gravity waves and their generation mechanisms. Pandya and Alexander (1999) showed that the spectral characteristics of convective gravity waves in a quasi-linear simulation forced by diabatic forcing alone is similar to that in a fully nonlinear

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Irina Sandu, Jean-Louis Brenguier, Olivier Geoffroy, Odile Thouron, and Valery Masson

different aerosol properties usually have different histories, which lead to systematic differences in the meteorology, making it difficult, if not impossible, to isolate the effect of the aerosol. Measurements of the large-scale forcings are not accurate enough, and our understanding of the dynamics of stratocumulus is not complete enough, to precisely predict what the LWP of a cloud layer should be. To illustrate this drawback, consider a STBL with a cloud base temperature of about 20°C and a cloud

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Joseph Egger and H-D. Schilling

1 MARCH 1984 JOSEPH EGGER AND H.-D. SCHILLING 779Stochastic Forcing of Planetary Scale Flow JOSEPH EGGER AND H.-D. SCHILLINGMeteorologisches Institut der Universitiit Miinchen, Munich, FRG(Manuscript received and in final form 12 October 1983) ABSTRACT Using geopotential height observations we analyze the fluctuations of the barotropic

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Leong Wai Siu and Kenneth P. Bowman

) demonstrated the importance of diabatic heating in simulating the NAMA using a mesoscale numerical model. Chao and Chen (2001) asserted that land–sea contrasts and orography are important for simulating the North American monsoon. Other thermal forcings may also be important. The heaviest North American monsoon precipitation is located along the Sierra Madre Occidental in northwestern Mexico; however, the heaviest precipitation in the western Hemisphere (WH) falls in the equatorial Pacific and Atlantic

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R. J. Haarsma and J. D. Opsteegh

Utrecht, Utrecht, The Netherlands (Manuscript received 12 October 1988, in final form I0 April 1989) We have investigated the nonlinear steady-state response of a barotropic model to an estimate of the observedanomalous tropical divergence forcing for the El Nifio winter of 1982/83, The 400 mb climatological fl0w wasmade a forced solution of the model by adding a relaxation forcing. The Rayleigh friction coefficient (~-~ -- 20days) was chosen such that this solution is marginally stable. The

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Michael T. Montgomery and John Persing

. (2001 , 106–107), for example, explained the dynamical importance of the nonlinear boundary layer in hurricane spinup as follows: As the storm deepens, the cross-isobaric radial inflow in the [marine boundary layer] transports more [absolute angular momentum] from the hurricane environment into the eyewall region than frictional dissipation. The major radial inflow decelerates as it approaches the [radius of maximum wind] where the centrifugal force exceeds [the radial pressure gradient force

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