Chapter 3: isentropic analysis

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Chapter 3: isentropic analysis 3.1 isentropic coordinate system 3.2 isentropic chart interpretation 3.3 vertical motion on isentropic charts

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Chapter 3: isentropic analysis. 3.1 isentropic coordinate system 3.2 isentropic chart interpretation 3.3 vertical motion on isentropic charts. isentropic coordinates. derivation of the equations of motion in isentropic coordinates: on blackboard. isobaric coordinates. - PowerPoint PPT Presentation

Transcript of Chapter 3: isentropic analysis

Page 1: Chapter 3: isentropic analysis

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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500

200

300

200

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