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Tropopause Height

Sat Mar 30, 2002 12:05 pm

Can someone please explain "tropopause height"? I've seen it in the context of flight plans and MCDU entries. My vague understanding of the term deals with weather predictions. In any case, can someone please enlighten me? Thank you.
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RE: Tropopause Height

Sat Mar 30, 2002 3:14 pm

Well to answer your question it is hard to say. You start with the Troposphere, varies with temperature and location, higher in the summer and at the equator, lower at the poles. At the equator, it usually extend to between 50 and 60 thousand feet, at the poles its 20 to 30 thousand feet. The Tropopause is the boundary between the Troposphere and the Stratosphere. It acts like a lid to keep most of the earth's moisture, and weather in the Troposphere. It is where the jetstream is. And the jetstream, as you know is a narrow band of high speed wind 50-150 kts. that meanders in and around the Tropopause. Then it goes Stratosphere, Mesophere and Thermosphere. I hope that helps

RE: Tropopause Height

Sat Mar 30, 2002 3:51 pm

As a general rule for us folks at the mid latitudes, it's usually about 36,000 feet MSL. However, it varies with season and weather pattern.

RE: Tropopause Height

Sat Mar 30, 2002 4:24 pm

Tropopause (height) is when the temperature is considered constant (stops becoming colder as you go higher). In real life it varies but for most FMS, it usually is fixed at 36,089 ft. Some FMS allows pilots to input a tropopause altitude.

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RE: Tropopause Height

Sat Mar 30, 2002 9:33 pm

The Tropopause altitude is the height where the temperature gradiant remains steady or become positive !!!
In general it is FL360 !

It can depend on the season and the geographic zone.

Regards !!!
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RE: Tropopause Height

Sun Mar 31, 2002 2:23 am

Thanks for the responses. How do pilots use this information? For example, UA flight plans have the tropopause height at each waypoint. What does a pilot do with this information?
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RE: Tropopause Height

Sun Mar 31, 2002 3:24 am

he needs this temperature info as his fuel is getting thicker at minus 60° C and he needs to get in warmer temperatures (this certainly is valid for b767, I don't know for other a/c)
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RE: Tropopause Height

Sun Mar 31, 2002 4:21 am

Useful information because the winds are usually strongest just below the tropopause and most adverse weather is below the tropopause.

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