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High natural aerosol loading over boreal forests.

P Tunved1, H-C Hansson, V-M Kerminen

  • 1Department of Applied Environmental Science (ITM), Air Pollution Laboratory, Frescativägen 54, SE-106 91, Stockholm, Sweden. peter.tunved@itm.su.se

Science (New York, N.Y.)
|April 15, 2006
PubMed
Summary

The European boreal forest significantly contributes to atmospheric aerosols. Forest emissions create climatically active particles, impacting radiation budget estimates and climate feedback loops.

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Area of Science:

  • Atmospheric Chemistry
  • Climate Science
  • Environmental Science

Background:

  • Aerosols significantly influence Earth's radiation balance.
  • Understanding aerosol sources is crucial for climate modeling.
  • The European boreal region's aerosol contribution requires further investigation.

Purpose of the Study:

  • To investigate the European boreal region as a source of atmospheric aerosol mass and number.
  • To establish a relationship between monoterpene emissions and aerosol formation in low-anthropogenic-impact areas.
  • To quantify the climatically relevant aerosol population generated by forests.

Main Methods:

  • Analysis of aerosol mass and number concentrations.
  • Correlation studies between monoterpene emissions and aerosol formation.
  • Field measurements in the European boreal region.

Main Results:

  • The European boreal region is identified as a substantial source of atmospheric aerosols.
  • A direct relationship was found between monoterpene emissions and gas-to-particle conversion.
  • Forests generate 1000-2000 particles/cm³ of climatically active sizes during the growing season.

Conclusions:

  • Boreal forests are significant natural sources of climatically relevant aerosols.
  • These findings are critical for refining atmospheric radiation budget calculations.
  • The study highlights the importance of biogenic aerosol emissions in climate feedback mechanisms.