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Preprints
https://doi.org/10.5194/acp-2019-1051
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1051
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 03 Dec 2019

Submitted as: research article | 03 Dec 2019

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Cloudy sky contributions to the direct aerosol effect

Gunnar Myhre1, Bjørn H. Samset1, Christian W. Mohr1, Kari Alterskjær1, Yves Balkanski2, Nicolas Bellouin3, Mian Chin4, James Haywood5,6, Øivind Hodnebrog1, Stefan Kinne7, Guangxing Lin8,a, Marianne T. Lund1, Joyce E. Penner9, Michael Schulz10, Nick Schutgens11, Ragnhild B. Skeie1, Philip Stier12, Toshihiko Takemura13, and Kai Zhang14 Gunnar Myhre et al.
  • 1CICERO Center for International Climate Research, Oslo, Norway
  • 2Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ-UPSaclay, Gif-sur-Yvette, France
  • 3Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
  • 4NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • 5College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, UK
  • 6Earth System and Mitigation Science, Met Office Hadley Centre, Exeter, EX1 3PB, UK
  • 7Max Plank Institute for Meteorology, Hamburg, Germany
  • 8University of Michigan, Ann Arbor, MI, USA
  • 9Department of Climate and Space Sciences and Engineering, University of Michigan, USA
  • 10Norwegian Meteorological Institute, Oslo, Norway
  • 11Earth Sciences, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
  • 12Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, UK
  • 13Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
  • 14Pacific Northwest National Laboratory, Richland, WA, USA
  • anow at: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA

Abstract. 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 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 shortwave 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.

Gunnar Myhre et al.

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Gunnar Myhre et al.

Gunnar Myhre et al.

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