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Contrails reduce daily temperature range.

David J Travis1, Andrew M Carleton, Ryan G Lauritsen

  • 1Department of Geography and Geology, University of Wisconsin-Whitewater, Whitewater, Wisconsin 53190, USA. travisd@uww.edu

Nature
|August 9, 2002
PubMed
Summary
This summary is machine-generated.

The absence of aircraft contrails during a three-day period in September 2001 led to an unusual increase in the daily temperature range. This suggests contrails significantly impact regional surface temperatures.

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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Aviation Impacts

Background:

  • The influence of aircraft condensation trails (contrails) on regional temperatures has been a long-standing question.
  • Empirical verification was challenging due to continuous air traffic.

Purpose of the Study:

  • To investigate the impact of contrails on diurnal temperature range.
  • To quantify the effect of contrail absence on surface temperatures.

Main Methods:

  • Analysis of surface temperature data during a period of reduced air traffic.
  • Comparison of diurnal temperature range before and after the event.

Main Results:

  • An anomalous increase in the average diurnal temperature range was observed from September 11-14, 2001.
  • This increase is attributed, in part, to the absence of contrails.

Conclusions:

  • Aircraft contrails demonstrably affect regional surface temperatures.
  • Contrail reduction leads to a wider diurnal temperature range by altering radiative transfer.