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Cloudy-sky contributions to the direct aerosol effect

Journal Article · · Atmospheric Chemistry and Physics (Online)
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [1];  [6];  [7];  [1];  [8];  [9];  [10];  [1];  [11];  [12];  [13]
  1. CICERO Center for International Climate Research, Oslo (Norway)
  2. Univ. of Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences du Climat et de l'Environment, CEA-CNRS-UVSQ
  3. Univ. of Reading (United Kingdom)
  4. NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  5. Univ. of Exeter (United Kingdom); Met Office Hadley Center, Exeter (United Kingdom). Earth System and Mitigation Science
  6. Max Planck Inst. for Meteorology, Hamburg (Germany)
  7. Univ. of Michigan, Ann Arbor, MI (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  8. Univ. of Michigan, Ann Arbor, MI (United States)
  9. Norwegian Meteorological Inst., Oslo (Norway)
  10. Vrije Univ. Amsterdam (Netherlands)
  11. Univ. of Oxford (United Kingdom)
  12. Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics
  13. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
+ Show Author Affiliations

The radiative forcing of the aerosol–radiation interaction can be decomposed into clear-sky and cloudy-sky portions. Two sets of multi-model simulations within Aerosol Comparisons between Observations and Models (AeroCom), combined with observational methods, and the time evolution of aerosol emissions over the industrial era show that the contribution from cloudy-sky regions is likely weak. A mean of the simulations considered is 0.01±0.1 W m-2. Multivariate data analysis of results from AeroCom Phase II shows that many factors influence the strength of the cloudy-sky contribution to the forcing of the aerosol–radiation interaction. Overall, single-scattering albedo of anthropogenic aerosols and the interaction of aerosols with the short-wave cloud radiative effects are found to be important factors. A more dedicated focus on the contribution from the cloud-free and cloud-covered sky fraction, respectively, to the aerosol–radiation interaction will benefit the quantification of the radiative forcing and its uncertainty range.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; Research Council of Norway; European Research Council (ERC)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1668268
Report Number(s):
PNNL-SA--147647
Journal Information:
Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Journal Issue: 14 Vol. 20; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)

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Table 1(p. 4)table Table 1
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