Tephigram exercise 1

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# Tephigram exercise 1 - PowerPoint PPT Presentation

Tephigram exercise 1. First we plot the temperature. Tephigram exercise 1. First we plot the temperature. Tephigram exercise 1. The red dots are the humidity. Tephigram exercise 1. Depth of the PBL?. Tephigram exercise 1. Depth of the PBL Approx 100 hPa. Tephigram exercise 1.

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Tephigram exercise 1

First we plot the temperature

Tephigram exercise 1

First we plot the temperature

Tephigram exercise 1

The red dots are the humidity

Tephigram exercise 1

Depth of the PBL?

Tephigram exercise 1

Depth of the PBL

Approx 100 hPa

Tephigram exercise 1

Q: RH at 1000 hPa?

Tephigram exercise 1

RH=rv/rs = 5 / 7.7 = 65%

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

Is the PBL well mixed?

Potential temperature at 800 hPa? (two ways)

Potential temperature at 800 hPa?

291K – Two ways to read…

700?

Potential temperature at 800 hPa?

291K – Two ways to read…

910 hPa and 2.5oC

Tephigram exercise 2

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

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

900 hPa = 23oC, 700hPa off the page, different tephigram bounds required

It is increasing with height.

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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C

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Gate

sounding