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Related Concept Videos

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Updated: May 27, 2025

Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer
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Decreasing aerosols increase the European summer diurnal temperature range.

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Aerosols significantly influence Europe's diurnal temperature range (DTR), the difference between daily maximum and minimum temperature. Reduced aerosol emissions since the 1980s have led to cooler nights, increasing the DTR.

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Area of Science:

  • Climate Science
  • Atmospheric Science
  • Environmental Science

Background:

  • Diurnal temperature range (DTR) is crucial for understanding extreme temperature impacts.
  • Previous research faced challenges attributing observed DTR changes to aerosol forcing.
  • Aerosols have known physical links to temperature variations.

Purpose of the Study:

  • To causally identify aerosols as a driver of European DTR changes since 1940.
  • To evaluate climate models' ability to simulate aerosol effects on DTR.
  • To derive effective radiative forcing estimates of aerosols on surface shortwave radiation.

Main Methods:

  • Application of causal inference methods to observational data.
  • Comparison of observed causal effects with simulations from two CMIP6 models.
  • Estimation of effective radiative forcing from causal effects.

Main Results:

  • Aerosols identified as a clear driver of European DTR changes since 1940.
  • European DTR increased by approximately 0.5K since the 1980s due to reduced aerosol emissions.
  • Agreement found between observed and modeled causal effects, validating model parameterizations.

Conclusions:

  • Aerosol emission reductions are responsible for the recent increase in European DTR.
  • Model evaluations suggest improvements in microphysical and radiative parameterizations are needed.
  • Effective radiative forcing estimates for aerosols range from -1.7 to -1.5 Wm⁻² in observations and one model.