George who? I'm sorry, I must have missed something. --- Frank C. Wimberly 140 Calle Ojo Feliz, Santa Fe, NM 87505
505 670-9918 Santa Fe, NM On Tue, Apr 30, 2024, 11:28 AM Nicholas Thompson <thompnicks...@gmail.com> wrote: > *Dear Phellow Phriamers,* > > > *What I love about George is that he speaks what others have in the backs > of heir minds but seem reluctant to say. So I have been reading in weather > books and articles for weeks, trying to work out the chicken/egg relation > between global-scale and synoptic-scale processes. None of those sources > has put the relation so plainly as does George below. Of course he may be > absurdly, flagrantly, ridiculously WRONG, but at least he has put it out > there. George seems to be good at discovering subtexts. Think what he > might do for psycho-analysis.* > > *Rossby waves, of course, are not only E-W waves along the polar front, > they are also up/down waves along the boundary between the Troposphere and > the Stratosphere, the Tropopause, so that in a Rossby trough, the > Tropopause is much closer to the ground than in a Rossby ridge. * > > > *George also believes that Rossby waves often stumble over mountain ranges > and continental boundaries. When they stumble, they often break, sending > Tropospheric air into the Stratosphere, and bringing Stratospheric air into > the Troposphere, perhaps even as far down as the surface. You know that > rush of odd-smelling air you get at the onset of a cold front? That may be > stratospheric air. * > > > 1. *Anyway: FWIW, here is George on Rossby Wavess and Frontogenesis. * *I > hope to join vFRIAM on Thursday around 11 MDT, in case there are other > weather nerds on the list who would like to talk about this. * > > > > *Nick* > > *What is the relation between Rossby waves and frontogenesis* > > *Rossby waves and frontogenesis are closely related atmospheric phenomena, > with Rossby waves playing a significant role in the generation and > maintenance of fronts through the process of frontogenesis. Here's how > they're connected:* > > 1. > > *Dynamic Instability: Rossby waves are large-scale meanders in the jet > stream that develop due to the interaction between the Earth's rotation and > horizontal temperature gradients in the atmosphere. These waves are > associated with dynamic instability in the atmosphere, leading to the > amplification and propagation of disturbances along the jet stream.* > 2. > > *Formation of Temperature Contrasts: Rossby waves often lead to the > development of regions with strong horizontal temperature gradients, known > as baroclinic zones, along their troughs and ridges. These temperature > contrasts are essential for frontogenesis, as they provide the necessary > conditions for the formation and intensification of fronts.* > 3. > > *Enhanced Vertical Motion: Along the troughs of Rossby waves, there is > typically enhanced upward motion of air, while along the ridges, there is > enhanced downward motion. This vertical motion is associated with the > convergence and divergence of air masses, respectively, which can > contribute to the formation of fronts through the process of > frontogenesis.* > 4. > > *Interaction with Baroclinic Zones: Rossby waves interact with > existing baroclinic zones in the atmosphere, which are regions of strong > horizontal temperature gradients. These interactions can lead to the > amplification or deformation of existing fronts and the generation of new > fronts through frontogenesis.* > 5. > > *Development of Cyclogenesis: Rossby waves can also contribute to the > development of cyclones, particularly in regions where there are strong > temperature gradients associated with fronts. Cyclogenesis often occurs > along frontal boundaries, where the convergence of air masses and enhanced > vertical motion associated with Rossby waves create favorable conditions > for low-pressure systems to develop.* > > *Overall, Rossby waves influence the development and maintenance of fronts > through the generation of temperature contrasts, enhanced vertical motion, > and interactions with existing baroclinic zones. Frontogenesis, in turn, > contributes to the intensification and evolution of cyclones and other > weather systems associated with the mid-latitude atmosphere.* > -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . > FRIAM Applied Complexity Group listserv > Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom > https://bit.ly/virtualfriam > to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: 5/2017 thru present > https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >
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