Download - Chapter 3: isentropic analysis
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Chapter 3: isentropic analysis
3.1 isentropic coordinate system3.2 isentropic chart interpretation3.3 vertical motion on isentropic charts
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isentropic coordinates
isentropic coordinates
isobaric coordinates
pros and cons of isentropic coordinates can be found in this meted module, by J. Moore
derivation of the equations of motion in isentropic coordinates: on blackboard
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Isentropic maps: some examples infer vertical motion – low levels
900850800
L
285 K
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295 K
450900
Isentropic maps: some examples same time, higher level
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295 K – relative humidity suggests that storm-relative motion has an easterly component in E Montana
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325 KIsentropic maps: some examples
same time, upper levels infer vertical motion – relate to QG argument
200
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sample isentropic charts showing winds, pressure, and winds
• College of Dupage• OU
280 K
2014/03/28/12Z
310 K 290 K
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2014/03/28/12Z
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diagnosing vertical motion on isentropic charts:impact of storm motion
time 1 time 1 time 2c
(u,v)storm-relative = (u,v) - c
This is discussed further in Section 6 of this meted module, by J. Moore
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vertical motion & diabatic processes
parcelperspective
layerperspective
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textbook case study: 3 Jan 2002, 00 UTC296 K surface
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500 mb height & abs vort - same time
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500 mb height & SLPsame time
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500 mb height & Q vectors & Q divergence - same time
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500 mb height & 700 mb omega - same time
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IDV 3D plot of 296K isentropic surfacewind vectors on this surface
same time (00 Z on 3 Jan 2002)
x Greensboro
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Greensboro (GSO) soundingsame time
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GSO
pressure and winds on the 296K isentropic surfacesame time
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296K pressure & wind 296K pressure & storm-relative wind
c = 8.5 m/s towards the ESE
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296K pressure & storm-relative wind & mixing ratio (g/kg) – same time
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296K pressure & storm-relative wind & precipitation (dBZ) – same time