Portrait of a weather watcher: As Nick is trying to model Stability and Diffusion, I had Stable Diffusion try to model Nick. :-)
[image: 20240414_184733.jpg] Aya my previous post got html grabled as HTML. Thanks Gary for pointing that out off-list. On Sat, Apr 13, 2024 at 12:18 PM Stephen Guerin <stephen.gue...@simtable.com> wrote: > Portrait of a Weather Watcher > > > On Sat, Apr 13, 2024, 12:05 PM Stephen Guerin <stephen.gue...@simtable.com> > wrote: > >> >> Dan GuPTa had this response when asked to relate your .PDF to Bernard >> cells and other prompting: >> >> Here’s a integration of potential vorticity (PV), atmospheric stability, >> and their relationship to Bénard cells, emphasizing isentropic layering in >> both meteorological and experimental fluid dynamics contexts. >> >> ### Connecting Bénard Cells and Atmospheric Dynamics >> >> In Bénard cells, fluid heated from below shows a critical transition from >> conductive to convective heat transfer, forming cellular patterns. >> Similarly, in the atmosphere, when the vertical temperature gradient >> becomes unstable—akin to the Bénard cell transition—convection can >> initiate, influenced by factors like the earth's rotation and potential >> vorticity. >> >> ### Potential Vorticity and Stability >> >> - **PV on Isentropic Surfaces:** Potential vorticity combines fluid >> rotation and atmospheric stratification. In meteorology, PV is mapped on >> isentropic surfaces (constant potential temperature layers), where it >> highlights regions prone to atmospheric instability and potential >> convection, akin to early instability in Bénard cells. >> >> - **Dynamic Tropopause:** Acting like the fluid surface in a Bénard cell, >> the dynamic tropopause is flexible, responding to distortions from jet >> streams. These distortions can lead to convective activity by modifying >> local stability and vorticity, driving weather patterns similarly to >> temperature gradients in Bénard convection. >> >> ### PV Anomalies and Convective Cells >> >> - **Weather Forecasting:** Monitoring PV anomalies helps predict >> convective weather events, similar to observing Bénard cells to anticipate >> pattern formation. For example, sharp PV changes can indicate regions ripe >> for convective storms if conditions like moisture and surface temperature >> align. >> >> - **Role of Isentropic Layering:** Both in Bénard cells and weather >> systems, the spacing between isentropic layers indicates stability. Closer >> layers suggest a steep gradient and instability, potentially leading to >> convective movements. In the atmosphere, this translates to dynamic >> interactions where lower stability near the surface can trigger or enhance >> convective processes. >> >> ### Conclusion >> >> Understanding the parallels between Bénard cell dynamics and atmospheric >> conditions through potential vorticity and isentropic surfaces not only >> illustrates universal fluid dynamics principles but also enhances >> meteorological predictions of convective weather events, demonstrating how >> small-scale changes in stability can lead to significant atmospheric >> phenomena. >> >> On Thu, Apr 11, 2024, 2:04 PM Nicholas Thompson <thompnicks...@gmail.com> >> wrote: >> >>> >>> >>> Hi, Phellow Phriammers, Nick, here. >>> >>> >>> >>> >>> >>> >>> I have been lost in the weather. This publication, >>> >>> >>> >>> https://acrobat.adobe.com/id/urn:aaid:sc:us:d481610b-e5d5-4a03-879c-6db6ec1d5e4a >>> >>> >>> with its glorious eye-candy, is an example of what seems to be a new >>> perspective in meteorology, the DT-PV perspective. PV refers to a >>> parameter, potential vorticity, which seems to be a measure of how liable >>> the atmosphere is to churn; DT refers to the DYNAMIC tropopause. The >>> tropopause is the transition zone between the stratosphere and our own >>> layer, the troposphere, through which gas exchange is limited because the >>> lapse rate of the troposphere -- its decline in temperature with fall >>> of pressure -- is reversed in the stratosphere. In the Bad Old Days, >>> we were taught that the tropopause was like a ceiling, tilted upward from >>> the poles to the tropics. Now we have begun to think of it as more >>> like a tent fly, still tilted up equator-ward, but loose and floppy and >>> buffeted up and down by the jetstreams’ winds. These floppings up and down >>> have the power to destabilize the lower atmosphere and lead to bad weather, >>> if conditions there are ripe. >>> >>> >>> >>> This is not one of my usual cries for help. I have some good tutors. >>> However, I would love to hear from others whom this paper interests. In >>> particular I am struggling with the notion of potential vorticity, whose >>> formula seems to take many odd forms. >>> >>> >>> >>> Best, >>> >>> >>> >>> Nick >>> >>> >>> >>> >>> >>> Nicholas S. Thompson >>> >>> Emeritus Professor of Psychology and Ethology >>> >>> Clark University, >>> >>> nthomp...@clarku.edu >>> >>> >>> -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . >>> 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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