*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.*
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