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<p>Organic aerosol particles (OA) can absorb solar radiation with varying efficiencies depending on their chemical composition and physical properties. This light-absorbing fraction of OA, commonly referred to as brown carbon (BrC), is difficult to accurately represent in climate models due to the inherent diversity of its optical properties. This variability arises from differences in emission sources and atmospheric processing, as well as from variations in experimental design and the analytical methods used to quantify BrC absorption. As a result, the climate effect of BrC remains uncertain. Here, we studied the light absorption properties of surface ambient OA using measurements from 17 sites across Europe. Combining multi-wavelength absorption measurements from filter-based photometers with OA mass concentrations and source apportionment derived from ACSM/AMS data, we derive empirical estimates of the OA mass absorption cross section (MAC<sub>OA</sub>), its wavelength dependence (AAE<sub>OA</sub>), the OA density (⍴<sub>OA</sub>), and the MAC associated with different primary and secondary OA sources. We further develop parameterizations that relate MAC<sub>OA</sub>, AAE<sub>OA</sub> and ⍴<sub>OA</sub> to the ambient black carbon-to-organic aerosol ratio (eBC/OA) and propose a corresponding parameterization for the imaginary refractive index (k<sub>OA</sub>). Given the widespread availability of eBC and OA measurements in global monitoring networks, the framework presented here provides a practical approach for estimating the absorptive properties of surface OA particles under real-world conditions.</p>

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Constraining the intensive absorption properties of ambient organic aerosol particles based on pan-European observations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月10日

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  • Jordi Rovira,
  • Jesús Yus-Díez,
  • Gang I. Chen,
  • Griša Močnik,
  • Martin Gysel-Beer,
  • Wenche Aas,
  • Minna Aurela,
  • John Backman,
  • Sujai Banerji,
  • Benjamin T. Brem,
  • Anna Canals-Angerri,
  • Benjamin Chazeau,
  • Kaspar R. Daellenbach,
  • Joel F. de Brito,
  • Evangelia Diapouli,
  • Konstantinos Eleftheriadis,
  • Mikael Ehn,
  • Olivier Favez,
  • Harald Flentje,
  • Maria I. Gini,
  • Konstantinos Granakis,
  • Asta Gregorič,
  • Roy Harrison,
  • Liine Heikkinen,
  • Christoph Hueglin,
  • Antti Hyvärinen,
  • Matic Ivančič,
  • Hannes Keernik,
  • Eleni Liakakou,
  • Chunshui Lin,
  • Radek Lhotka,
  • Krista Luoma,
  • Marek Maasikmets,
  • Hanna E. Manninen,
  • Manousos Ioannis Manousakas,
  • Nicolas Marchand,
  • Saliou Mbengue,
  • Nikos Mihalopoulos,
  • María Cruz Minguillón,
  • Doina Nicolae,
  • Jarkko V. Niemi,
  • Jurgita Ovadnevaite,
  • Noemí Pérez,
  • Jean-Eudes Petit,
  • Stephen M. Platt,
  • Petra Pokorná,
  • André S. H. Prévôt,
  • Véronique Riffault,
  • Martin Rigler,
  • Matteo Rinaldi,
  • Jaroslav Schwarz,
  • Iasonas Stavroulas,
  • Erik Teinemaa,
  • Kimmo Teinilä,
  • Hilkka Timonen,
  • Anna Tobler,
  • Jeni Vasilescu,
  • Marta Via,
  • Petr Vodička,
  • Stergios Vratolis,
  • Karl Espen Yttri,
  • Naděžda Zíková,
  • Olga Zografou,
  • Andrés Alastuey,
  • Tuukka Petäjä,
  • Xavier Querol,
  • Marco Pandolfi

摘要

Organic aerosol particles (OA) can absorb solar radiation with varying efficiencies depending on their chemical composition and physical properties. This light-absorbing fraction of OA, commonly referred to as brown carbon (BrC), is difficult to accurately represent in climate models due to the inherent diversity of its optical properties. This variability arises from differences in emission sources and atmospheric processing, as well as from variations in experimental design and the analytical methods used to quantify BrC absorption. As a result, the climate effect of BrC remains uncertain. Here, we studied the light absorption properties of surface ambient OA using measurements from 17 sites across Europe. Combining multi-wavelength absorption measurements from filter-based photometers with OA mass concentrations and source apportionment derived from ACSM/AMS data, we derive empirical estimates of the OA mass absorption cross section (MACOA), its wavelength dependence (AAEOA), the OA density (⍴OA), and the MAC associated with different primary and secondary OA sources. We further develop parameterizations that relate MACOA, AAEOA and ⍴OA to the ambient black carbon-to-organic aerosol ratio (eBC/OA) and propose a corresponding parameterization for the imaginary refractive index (kOA). Given the widespread availability of eBC and OA measurements in global monitoring networks, the framework presented here provides a practical approach for estimating the absorptive properties of surface OA particles under real-world conditions.