Contrails and Aviation-cirrus

Links (01)

Weersverwachting: zonnig met vliegtuigstrepen
We weten al een tijdje dat de zeespiegel stijgt, maar nu worden de gevolgen pas pijnlijk duidelijk. De eerste eilandjes zijn al verdronken. En vreemd genoeg hebben de condensstrepen die vliegtuigen in de lucht trekken daar rechtstreeks mee te maken.

Bron: De mooie en informatieve website van Carl Koppeschaar:
http://www.xs4all.nl/~carlkop/specials/contrail/strepen.html

9/11 study: Air traffic affects climate , 
August 8, 2002 Posted: 1:29 PM EDT (1729 GMT)
By Richard Stenger CNN

"Contrails, such as in this satellite image over California, have an impact on temperatures, scientists say. The trail of condensation forms in an aircraft's wake"
Source: http://www.cnn.com/2002/TECH/science/08/07/contrails.climate/

Increases in U.S. Jet Contrail Coverage:  Temporal and Spatial Associations with the Arctic Oscillation Teleconnection and Tropopause Cooling.  

Travis, D.J., University of Wisconsin-Whitewater , Carleton, A.M., Pennsylvania State University , Johnson, J.S., Northern Illinois University , and J.Q. DeGrand, Ohio State University .

Recent studies of jet condensation trails (contrails) provide increasing evidence of their potential to modify regional-scale climate.  Although increases in contrail coverage have been speculated upon for many years, little quantitative assessment has been done both to confirm this speculation and to measure the rate of increase.  Moreover, it has always been assumed that such an increase in contrails is primarily controlled by the rates of increase of jet traffic.  This study utilizes satellite data from two periods, 1979-79 and 2000-02, to compare changes in contrail occurrence across the lower 48 United States .  GIS is used to determine frequencies of contrail coverage by 1x1 degree grids for each period separately as well as the change between the two.  The results indicate that jet contrail coverage for the U.S. has increased by more than an order of magnitude during the past 25 years.  This increase is substantially larger than the 214% percent increase of air traffic miles reported during the same period.  The greatest increases have occurred in the East and South, and during January and July, corresponding with the regions and months having the greatest tropopause temperature decrease.  Recent studies have attributed the U.S. tropopause temperature decrease to changes in the “arctic oscillation”, possibly also linked to lower tropospheric warming during the past 25 years.  These findings imply that further surface-based warming, and related upper-tropospheric cooling, may lead to an even larger increase in contrail coverage in the future, beyond that projected from anticipated increases in air traffic.   

Dr. David J. Travis, Climatologist 
Upcoming Conference Presentations:
03/14/04 - 03/19/04 Philadelphia, PA
+ Increases in Contrail Coverage

KNMI, the Dutch Royal Meteorological Institute, researches contrails and their effects

"De afdeling Atmosferische Samenstelling (AS) draagt bij aan het monitoren van gassen en aërosolen, vanaf de grond en vanuit satellieten, alsmede aan het optimaliseren van waarnemingen d.m.v. nieuwe rekenmethodes. Daarnaast analyseert en modelleert AS de samenstelling van de atmosfeer en doet onderzoek naar natuurlijke en door de mens veroorzaakte veranderingen van de atmosfeersamenstelling, inclusief luchtkwaliteit." (http://www.knmi.nl/onderzk/atmosam/aviation.html)

Aviation and the global Atmosphere- IPCC Summary for Policymakers (complete versie)

We work closely with local, national and international decision-makers to achieve this objective, having representation on UK Government and European Commission working groups and observer status to the environmental committee of the International Civil Aviation Organisation (ICAO).
http://www.aef.org.uk
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Der alte Traum vom Fliegen - 
Was aber wäre, wenn alle Menschen fliegen würden?

Bisher nehmen gerade 6,5% der Weltbevölkerung am Flugverkehr teil. Durch technische Verbesserungen, hauptsächlich aber durch beachtliche staatliche Subventionsmaßnahmen ist Fliegen heute preiswerter denn je. Der Flugverkehr ist in den letzten sechs Jahren um mehr als die Hälfte angestiegen und bis zum Jahre 2010 werden sich die Personenkilometer voraussichtlich verdoppeln. Damit besitzt der Flugverkehr die höchste Steigerungsrate aller Verkehrsträger.
http://user.cs.tu-berlin.de/~roland/flug
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Green Party (UK)
http://www.greenparty.org.uk