[FRIAM] George on Rossby Waves and Frontogenesis

Tue Apr 30 14:23:05 EDT 2024

Sorry.  Running gag.  George=GeorgePhillipTremblay= Chat GPT

On Tue, Apr 30, 2024 at 11:58 AM Frank Wimberly <wimberly3 at gmail.com> wrote:

> 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 <thompnickson2 at 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.*
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