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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2018-491
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
12 Jun 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Additional Global Climate Cooling by Clouds due to Ice Crystal Complexity
Emma Järvinen1, Olivier Jourdan2, David Neubauer3, Bin Yao4, Chao Liu4, Meinrat O. Andreae5,6, Ulrike Lohmann3, Manfred Wendisch7, Greg M. McFarquhar8,9, Thomas Leisner1, and Martin Schnaiter1 1Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
2Laboratoire de Météorologie Physique, Université Clermont Auvergne, OPGC, UMR/CNRS 6016, Clermont-Ferrand, France
3Institute of Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland
4Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
5Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
6Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
7Leipzig Institute for Meteorology, University of Leipzig, Leipzig, Germany
8Cooperative Institute for Mesoscale Meteorological Studies, University of Oklahoma, Norman, OK, USA
9School of Meteorology, University of Oklahoma, Norman, OK, USA
Abstract. Ice crystal submicron structures have a large impact on the optical properties of cirrus clouds and consequently on their radiative effect. Although there is growing evidence that atmospheric ice crystals are rarely pristine, direct in-situ observations of the degree of ice crystal complexity are largely missing. Here we show a comprehensive in-situ dataset of ice crystal complexity coupled with measurements of the cloud asymmetry factor collected at diverse geographical locations. Our results demonstrate that an overwhelming fraction (between 61 and 81 %) of atmospheric ice crystals in the different regions sampled contain submicron deformations and, as a consequence, a low asymmetry factor of 0.75 is observed. The measured cloud angular light scattering functions were parameterized in terms of the cloud bulk asymmetry factor and tested in a global climate model. The modelling results suggest that due to ice crystal complexity, ice clouds can induce an additional cooling effect of −1.12 W m−2 on the radiative budget that has not yet been considered.
Citation: Järvinen, E., Jourdan, O., Neubauer, D., Yao, B., Liu, C., Andreae, M. O., Lohmann, U., Wendisch, M., McFarquhar, G. M., Leisner, T., and Schnaiter, M.: Additional Global Climate Cooling by Clouds due to Ice Crystal Complexity, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-491, in review, 2018.
Emma Järvinen et al.
Emma Järvinen et al.
Emma Järvinen et al.

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Short summary
Using light diffraction it is possible to detect small features within ice particles, like surface roughness, that have not yet been fully characterised. It was found that majority of all atmospheric ice particles have small features that significantly change the way atmospheric particles interact with solar light. These small features make ice containing clouds more reflective than previously thought, which could have consequences for predicting our climate.
Using light diffraction it is possible to detect small features within ice particles, like...
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