TELEMAC-MASCARET Forum: Atmospheric pressure (1/1)

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TOPIC: Atmospheric pressure

Atmospheric pressure 4 years 6 months ago #35857

DHaverson
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Hi

I have implemented time varying pressure in Telemac2D (v8p0r2), and is working fine. I see small changes in the free surface compared to tide only runs.

But could some please clarify the units of atmospheric pressure.

In the manual (v8p0) the keyword AIR PRESSURE has a default value of 10,000 Pa. Whereas, in the T2D example waq2d_thermic, the meteo file has values of 1000 mbar. Again, when using the scripts convert_ECMWF.py the values of pressure in the binary meteorological files are on the order of 10,000 Pa.

So which is the correct unit? or is it specific depending on the wind file option 2 or 3 etc?

Many thanks

David

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Atmospheric pressure 4 years 6 months ago #35860

pham
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Hello David,

The correct unit for atmospheric pressure is Pa.

Nevertheless, if coupling with WAQTEL or WIND = YES, and also use ASCII ATMOSPHERIC DATA FILE at the same time, the expected unit for pressure in the ASCII ATMOSPHERIC DATA FILE is mbar (= hPa) as you wrote.
For the latter, the choice was done because meteo data for pressure are often given with this format.

Hope this helps,

Chi-Tuan

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Atmospheric pressure 4 years 6 months ago #35862

DHaverson OFFLINE Senior Boarder Posts: 68 Thank you received: 4	Thank you Chi-Tuan, that's much clearer. David
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