The Rate of Homogenous Nucleation of Ice in Supercooled Water.

Article English OPEN
Atkinson, JD ; Murray, BJ ; O'Sullivan, D (2016)
  • Publisher: American Chemical Society

The homogeneous freezing of water is of fundamental importance to a number of fields, including that of cloud formation. However, there is considerable scatter in homogeneous nucleation rate coefficients reported in the literature. Using a cold stage droplet system designed to minimize uncertainties in temperature measurements, we examined the freezing of over fifteen hundred pure water droplets with diameters between 4 and 24 μm. Under the assumption that nucleation occurs within the bulk of the droplet, nucleation rate coefficients fall within the spread of literature data and are in good agreement with a subset of more recent measurements. To quantify the relative importance of surface and volume nucleation in our experiments, where droplets are supported by a hydrophobic surface and surrounded by oil, comparison of droplets with different surface area to volume ratios was performed. From our experiments it is shown that in droplets larger than 6 µm diameter (between 234.6 and 236.5 K), nucleation in the interior is more important than nucleation at the surface. At smaller sizes we cannot rule out a significant contribution of surface nucleation, and in order to further constrain surface nucleation experiments with smaller droplets are necessary. Nevertheless, in our experiments, it is dominantly volume nucleation controlling the observed nucleation rate.
  • References (42)
    42 references, page 1 of 5

    Heymsfield, A.J. and L.M. Miloshevich, Homogeneous Ice Nucleation and Supercooled Liquid Water in Orographic Wave Clouds. Journal of the Atmospheric Sciences. 1993, 50, 2335-2353. DOI: 10.1175/1520- 0469(1993)050<2335:HINASL>2.0.CO;2.

    Kärcher, B. and J. Strom, The roles of dynamical variability and aerosols in cirrus cloud formation. Atmospheric Chemistry and Physics. 2003, 3, 823-838. DOI: 10.5194/acp3-823-2003.

    Cziczo, D.J., D.M. Murphy, P.K. Hudson, and D.S. Thomson, Single particle measurements of the chemical composition of cirrus ice residue during CRYSTALFACE. Journal of Geophysical Research. 2004, 109, D04201. DOI: 10.1029/2003JD004032.

    Cziczo, D.J., K.D. Froyd, C. Hoose, E.J. Jensen, M. Diao, M.A. Zondlo, J.B. Smith, C.H. Twohy, and D.M. Murphy, Clarifying the Dominant Sources and Mechanisms of Cirrus Cloud Formation. Science. 2013, 340, 1320-1324. DOI: 10.1126/science.1234145.

    Herbert, R.J., B.J. Murray, S.J. Dobbie, and T. Koop, Sensitivity of liquid clouds to homogenous freezing parameterisations. Geophysical Research Letters. 2015, 42, 1599-1605. DOI: 10.1002/2014GL062729.

    Kärcher, B. and A. Seifert, On homogeneous ice formation in liquid clouds. Quarterly Journal of the Royal Meteorological Society. 2016, 142, 1320-1334. DOI: 10.1002/qj.2735.

    Riechers, B., F. Wittbracht, A. Hütten, and T. Koop, The homogeneous ice nucleation rate of water droplets produced in a microfluidic device and the role of temperature uncertainty. Physical Chemistry Chemical Physics. 2013, 15, 5873-5887. DOI: 10.1039/C3CP42437E.

    Murray, B.J., S.L. Broadley, T.W. Wilson, S.J. Bull, R.H. Wills, H.K. Christenson, and E.J. Murray, Kinetics of the homogeneous freezing of water. Physical Chemistry Chemical Physics. 2010, 12, 10380-10387. DOI: 10.1039/c003297b.

    DeMott, P.J. and D.C. Rogers, Freezing Nucleation Rates of Dilute-Solution Droplets Measured between -30 °C and -40 °C in Laboratory Simulations of Natural Clouds.

    Journal of the Atmospheric Sciences. 1990, 47, 1056-1064. DOI: 10.1175/1520- 0469(1990)047<1056:FNRODS>2.0.CO;2.

  • Related Research Results (1)
  • Metrics
    views in OpenAIRE
    views in local repository
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    White Rose Research Online - IRUS-UK 0 76
Share - Bookmark