Topic Author
Posts: 2694
Joined: Sun Jul 16, 2000 3:44 am

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.
Posts: 13
Joined: Wed Nov 08, 2000 6:37 am

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.

User avatar
Posts: 3547
Joined: Mon Oct 08, 2001 9:44 pm

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 !!!
Topic Author
Posts: 2694
Joined: Sun Jul 16, 2000 3:44 am

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?
Posts: 391
Joined: Sat Mar 30, 2002 3:34 am

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)
Posts: 122
Joined: Sat Feb 16, 2002 11:46 am

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.

Who is online

Users browsing this forum: DanM64 and 19 guests

Popular Searches On

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos