Predicting global atmospheric ice nuclei distributions and their impacts on climate Public Deposited

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  • Knowledge of cloud and precipitation formation processes remains incomplete, yet global precipitation is predominantly produced by clouds containing the ice phase. Ice first forms in clouds warmer than −36 °C on particles termed ice nuclei. We combine observations from field studies over a 14-year period, from a variety of locations around the globe, to show that the concentrations of ice nuclei active in mixed-phase cloud conditions can be related to temperature and the number concentrations of particles larger than 0.5 μmin diameter. This new relationship reduces unexplained variability in ice nuclei concentrations at a given temperature from ~10³ to less than a factor of 10, with the remaining variability apparently due to variations in aerosol chemical composition or other factors. When implemented in a global climate model, the new parameterization strongly alters cloud liquid and ice water distributions compared to the simple, temperature-only parameterizations currently widely used. The revised treatment indicates a global net cloud radiative forcing increase of ~1 Wm⁻² for each order of magnitude increase in ice nuclei concentrations, demonstrating the strong sensitivity of climate simulations to assumptions regarding the initiation of cloud glaciation.
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  • DeMott, P. J., Prenni, A. J., Liu, X., Kreidenweis, S. M., Petters, M. D., Twohy, C. H., et al. (2010, June 22). Predicting global atmospheric ice nuclei distributions and their impacts on climate [Electronic version]. Proceedings of the National Academy of Sciences of the United States of America, 107(25), 11217-11222. doi:10.1073/pnas.0910818107
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2012-01-24T18:38:33Z No. of bitstreams: 1 TwohyCH.CEOAS.PredictingGlobalAtmospheric.pdf: 3449629 bytes, checksum: ab791d67c3aac618ac10f52f3a845e76 (MD5)
  • description.provenance : Made available in DSpace on 2012-01-24T18:38:33Z (GMT). No. of bitstreams: 1 TwohyCH.CEOAS.PredictingGlobalAtmospheric.pdf: 3449629 bytes, checksum: ab791d67c3aac618ac10f52f3a845e76 (MD5) Previous issue date: 2010-06-22

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