A few summary slides AOS C115/228 - Spring 2008. Thermals: buoyancy pressure dynamic pressure decomposition of pdyn.

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Presentation transcript:

A few summary slides AOS C115/228 - Spring 2008

Thermals: buoyancy pressure dynamic pressure decomposition of pdyn

< Textbook sea-breeze circulation

Rotunno’s analytic solution If f >  (poleward of 30˚) equation is elliptic sea-breeze circulation spatially confined circulation in phase with heating circulation, onshore flow strongest at noon circulation amplitude decreases poleward If f <  (equatorward of 30˚) equation is hyperbolic sea-breeze circulation is extensive circulation, heating out of phase f = 0 onshore flow strongest at sunset f = 0 circulation strongest at midnight [and noon] If f =  (30˚N) equation is singular some friction or diffusion is needed circulation max at sunset onshore flow strongest at noon

f <  (equatorward of 30˚)  at three times sunrise noon (reverse sign for midnight) [Circ magnitude max] sunset Note coastline onshore flow max at sunset

Circulation vs. time Eq 30N 60N 90N sunset Physically, why does circulation magnitude decr. with latitude? Why is circ. max become earlier? Why does DTDM results differ slightly from theory? midnight

Hovmoller diagrams What is missing?

Two slides from Asai (1970a) on thermal instability

Slides from Asai (1972)’s two cases. One of these local max was dubbed inflection-point instability. How was that justified?

Weckwerth’s experiments What did we learn from these?

Houze’s concept model ^ T-storm project life cycle concept ^ Newton’s (1963) concept; what was wrong with it? < Browning’s multicell concept

How were the features in this surface pressure trace explained? How was the wake low explained?

What was the RKW argument, and what does its explanation imply? ^ Why do supercells seem to split? < What environmental conditions favor supercells vs. multicell storms? What was BRi?

What favors right-movers in US? L L How were these pressure features explained? Which terms explained splitting, which explained forward motion, how was motion to the left or right of the mean winds explained?

Our first look at flow near obstacles examined the “simple” case of the hydraulic jump. We soon realized this was a special case in the theory of mountain-type waves. What was the Scorer parameter and what role did it play in understanding these very different results?