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Tephigram exercise 1 First we plot the temperature

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Tephigram exercise 1 First we plot the temperature

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Tephigram exercise 1 The red dots are the humidity

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Tephigram exercise 1 Depth of the PBL?

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Tephigram exercise 1 Depth of the PBL Approx 100 hPa

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Tephigram exercise 1 Q: RH at 1000 hPa?

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Tephigram exercise 1 RH=rv/rs = 5 / 7.7 = 65%

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**Depth of the PBL=100hPa. RH@1000hPa=65% @900hPa=85%**

Is the PBL well mixed? Potential temperature at 800 hPa? (two ways)

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**Potential temperature at 800 hPa?**

291K – Two ways to read…

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700? Potential temperature at 800 hPa? 291K – Two ways to read…

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**What is the condensation temperature and pressure of parcel at 1000 hPa?**

910 hPa and 2.5oC Tephigram exercise 2

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**What is dew point temperature of parcel at 1000 hPa?**

Approximately 4oC

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**Rainfall evaporated into parcel at 1000 hPa?**

Becomes saturated at 7oC, called the “wet-bulb temperature” Mixing ratio at this point is 6.3 g kg-1

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**What is the equivalent potential temperature of parcel at 1000 hPa?**

22.5oC – this is the same as the equivalent temperature.

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**What is the equivalent potential temperature of parcel at 900 hPa?**

900 hPa = 23oC, 700hPa off the page, different tephigram bounds required It is increasing with height.

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**LCL is 910 hPa (same as condensation pressure). LFC undefined.**

What are the LCL and LFC for parcel at 1000 hPa? Tephigram exercise 3 LCL is 910 hPa (same as condensation pressure). LFC undefined. Trigger temperature 17oC, convection unlikely, as requires strong heating.

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**What is dew point temperature of parcel at 1000 hPa?**

Approximately 4oC

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E F D C B A

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**Tephigram V: Convective Instability**

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**Convective Instability**

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**Tephigram V: Convective Instability**

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**Tephigram V: Convective Instability**

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**Tephigram V: Convective Instability**

Stable -8C and -14C

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Gate sounding

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If θ/z = 0, the atmosphere is said to be neutral,or neutrally stratified, and the lapse rate is equal to the dry adiabatic lapse rate (DALR) Γ d ~= 10.

If θ/z = 0, the atmosphere is said to be neutral,or neutrally stratified, and the lapse rate is equal to the dry adiabatic lapse rate (DALR) Γ d ~= 10.

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