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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Aerosol Absorption: Progress Towards Global and Regional Constraints.

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Aerosol absorption of solar radiation impacts climate. This review highlights progress and remaining uncertainties in understanding aerosol absorption

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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Aerosol Science

Background:

  • Aerosols significantly influence Earth's radiative balance by absorbing solar radiation.
  • This absorption affects cloud properties, atmospheric stability, circulation, and the water cycle.
  • Understanding aerosol absorption is critical for accurate climate modeling.

Purpose of the Study:

  • To review recent advancements in constraining aerosol absorption globally and regionally.
  • To assess the role of physical properties and combined approaches in understanding aerosol influences.
  • To identify key areas for future research in aerosol absorption.

Main Methods:

  • Review of recent observational data and climate modeling studies.
  • Analysis of developments in characterizing black carbon, brown carbon, and dust.
  • Evaluation of source modeling, size distributions, and absorbing aerosol above cloud phenomena.

Main Results:

  • Progress in understanding black carbon coating/ageing and brown carbon characterization.
  • Advancements in dust composition and absorbing aerosol above cloud studies.
  • Validation of high-resolution models against diverse observational datasets.

Conclusions:

  • Significant uncertainties persist in observations and models of aerosol absorption, impacting climate applications.
  • Key uncertainties remain in aerosol optical depths, single scattering albedo, and vertical distribution.
  • A roadmap for future developments is proposed to advance the field of aerosol absorption research.