Thread View: sci.physics
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Started by Surfer
Wed, 10 Apr 2013 04:04
Global warming could make flights bumpier
Author: Surfer
Date: Wed, 10 Apr 2013 04:04
Date: Wed, 10 Apr 2013 04:04
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Warming of air near the earth's surface could increase the average strength of turbulence by 10% to 40% by the middle of the century. http://blogs.physicstoday.org/newspicks/2013/04/global-warming-could-make-north-atlantic-flights-bumpier/
Re: Global warming could make flights bumpier
Author: jimp
Date: Thu, 11 Apr 2013 17:30
Date: Thu, 11 Apr 2013 17:30
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In sci.physics Surfer <no@spam.net> wrote: > > Warming of air near the earth's surface could increase the average > strength of turbulence by 10% to 40% by the middle of the century. > http://blogs.physicstoday.org/newspicks/2013/04/global-warming-could-make-north-atlantic-flights-bumpier/ The area of the atmosphere studied is 3 orders of magnitude higher than airplanes fly. Yet another GIGO computer model... -- Jim Pennino
Re: Global warming could make flights bumpier
Author: Surfer
Date: Fri, 12 Apr 2013 19:15
Date: Fri, 12 Apr 2013 19:15
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On Thu, 11 Apr 2013 17:30:36 -0000, jimp@specsol.spam.sux.com wrote: >In sci.physics Surfer <no@spam.net> wrote: >> >> Warming of air near the earth's surface could increase the average >> strength of turbulence by 10% to 40% by the middle of the century. >> http://blogs.physicstoday.org/newspicks/2013/04/global-warming-could-make-north-atlantic-flights-bumpier/ > >The area of the atmosphere studied is 3 orders of magnitude higher than >airplanes fly. > Are you sure that is what you mean? The average cruising altitude for long haul flights ranges from about 9 to 12 km. 3 orders of magnitude higher than that would be 9,000 to 12,000 km-- well outside the atmosphere !
Re: Global warming could make flights bumpier
Author: jimp
Date: Sat, 13 Apr 2013 23:22
Date: Sat, 13 Apr 2013 23:22
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In sci.physics Surfer <no@spam.net> wrote: > On Thu, 11 Apr 2013 17:30:36 -0000, jimp@specsol.spam.sux.com wrote: > >>In sci.physics Surfer <no@spam.net> wrote: >>> >>> Warming of air near the earth's surface could increase the average >>> strength of turbulence by 10% to 40% by the middle of the century. >>> http://blogs.physicstoday.org/newspicks/2013/04/global-warming-could-make-north-atlantic-flights-bumpier/ >> >>The area of the atmosphere studied is 3 orders of magnitude higher than >>airplanes fly. >> > Are you sure that is what you mean? It was a unit conversion screw up in going to feet, which is what I fly in. Anyway... Turbulence is caused by vertical air currents, not horizontal ones. Vertical air currents are caused by ground heating and convection in storm cells, i.e. thunderstorms. No one flys through storm cells. Turbulance from ground heating is pretty much over above about 4,000 feet except over patchy desert areas on really hot days where it may go a bit higher. Horizontal currents cause shear. This article seems to me to be a bunch of arm waving. -- Jim Pennino
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