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Tropopause Height  
User currently offlineModesto2 From United States of America, joined Jul 2000, 2898 posts, RR: 5
Posted (14 years 2 months 15 hours ago) and read 7001 times:

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.

7 replies: All unread, jump to last
User currently offlineDknhawkins From United States of America, joined Nov 2000, 13 posts, RR: 0
Reply 1, posted (14 years 2 months 12 hours ago) and read 6986 times:

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

User currently offlineNormalSpeed From , joined Dec 1969, posts, RR:
Reply 2, posted (14 years 2 months 11 hours ago) and read 6978 times:

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.

User currently offlineMD11Nut From , joined Dec 1969, posts, RR:
Reply 3, posted (14 years 2 months 11 hours ago) and read 6976 times:

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.


User currently offlineTs-ior From Tunisia, joined Oct 2001, 3731 posts, RR: 5
Reply 4, posted (14 years 2 months 5 hours ago) and read 6959 times:

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 !!!

User currently offlineModesto2 From United States of America, joined Jul 2000, 2898 posts, RR: 5
Reply 5, posted (14 years 2 months 1 hour ago) and read 6956 times:

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?

User currently offline744rules From Belgium, joined Mar 2002, 408 posts, RR: 0
Reply 6, posted (14 years 2 months ago) and read 6953 times:

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)

User currently offlineBjones From United States of America, joined Feb 2002, 123 posts, RR: 0
Reply 7, posted (14 years 1 month 4 weeks 1 day 23 hours ago) and read 6946 times:

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

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