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The High Supersaturation Puzzle Thomas Peter, Claudia Marcolli, Peter Spichtinger, Thierry Corti Institute for Atmospheric and Climate Science, ETH Zurich, Switzerland Marcia Baker Atmospheric Sciences, University of Washington, Seattle, Wash., USA Thomas Koop Department of Chemistry, Bielefeld University, Bielefeld, Germany Thanks to Martina Krämer, Jülich, and Holger Vömel, NOAA The discovery of massive supersaturations with respect to ice in upper tropospheric cloud-free air and inside ice clouds calls into question our understanding of the physics of cloud formation.
Saturation ratio with respect to ice: partial pressure of water vapor pressure of ice S > 1 S = 1 S < 1 ice particles grow ice particles are in equilibrium with the gas phase ice particles evaporate s = S – 1 supersaturation Relative humidity wrt ice: RHI = S S = 1 RHI = 100 %
Page 1: The High Supersaturation Puzzle
Page 5 and 6: Two questions central to our unders
Page 7 and 8: How do we expect S in a cirrus to d
Page 9 and 10: Jensen et al., Atmos. Chem. Phys.,
Page 11 and 12: Lee et al., JGR, 2004: Measured tem
Page 13 and 14: Increasing stratospheric humidity I
Page 15 and 16: “T hey live for a short tim e in
Page 17 and 18: Atmospheric Application Water Activ
Page 19 and 20: ice saturation ratio S What does th
Page 21 and 22: How does water vapor condense on ic
Page 23 and 24: Steady-state S to a good approximat
Page 25 and 26: Steady-state S in cirrus: tradition
Page 27 and 28: Steady-state S in cirrus: tradition
Page 29 and 30: Several slides with unpublished dat
Page 31 and 32: Shilling et al., Vapor Pressure of
Page 33 and 34: Potential out-of-cloud effects: Lac
Page 35 and 36: ice saturation ratio S Potential ou
Page 37 and 38: Potential in-cloud effects: Mesosc
Page 40 and 41: Potential in-cloud effects: HNO 3
Page 42 and 43: ice saturation ratio S Potential in
Page 44 and 45: Summary of Potential Explanations:
Page 46: Summary of Potential Explanations:

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