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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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Enhanced Light Absorption and Radiative Forcing by Black Carbon Agglomerates.

Georgios A Kelesidis1, David Neubauer2, Liang-Shih Fan3

  • 1Particle Technology Laboratory, Institute of Energy and Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Sonneggstrasse 3, CH-8092 Zürich, Switzerland.

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|June 2, 2022
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Summary
This summary is machine-generated.

Black carbon (BC) climate models may underestimate warming. Realistic BC particle shapes enhance light absorption, increasing radiative forcing (RF) and regional temperatures significantly.

Keywords:
black carbonmass absorption cross-sectionmorphologyoptical propertiesradiative forcing

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Area of Science:

  • Atmospheric Science
  • Climate Modeling
  • Radiative Transfer

Background:

  • Black carbon (BC) is recognized by the Intergovernmental Panel on Climate Change as a key driver of global warming due to its radiative forcing (RF) impact.
  • Current climate models may significantly underpredict BC's direct RF because they often assume a simplified spherical morphology for BC particles.

Purpose of the Study:

  • To investigate the impact of realistic black carbon morphology on its radiative forcing.
  • To quantify the enhancement in light absorption and RF due to light scattering in BC agglomerates.

Main Methods:

  • Applied Rayleigh-Debye-Gans theory and discrete dipole approximation to model light scattering in BC agglomerates.
  • Incorporated recent relations for refractive index and lensing effects.
  • Utilized ECHAM-HAM simulations with realistic BC morphology and coatings.

Main Results:

  • Light absorption of BC is enhanced by approximately 20% due to multiple light scattering between primary particles, irrespective of agglomerate compactness.
  • Simulations reveal high direct RF (3-5 W/m²) in regions like East/South Asia and Africa.
  • These findings align with satellite and AERONET observations.

Conclusions:

  • Realistic BC morphology significantly increases its radiative forcing, challenging previous model assumptions.
  • BC emissions contribute substantially to regional climate warming, estimated at 0.75-1.25 °C.
  • Accurate representation of BC's physical properties is crucial for precise climate change projections.