Deposition nucleation viewed as homogeneous or immersion freezing in pores and cavities

By C. Marcolli. 2013

262 citations recorded by the source corpus.

Abstract. Heterogeneous ice nucleation is an important mechanism for the glaciation of mixed phase clouds and may also be relevant for cloud formation and dehydration at the cirrus cloud level. It is thought to proceed through different mechanisms, namely contact, condensation, immersion and deposition nucleation. Conceptually, deposition nucleation is the only pathway that does not involve liquid water, but occurs by direct water vapor deposition onto a surface. This study challenges this classical view by putting forward the hypothesis that what is called deposition nucleation is in fact pore condensation and freezing (PCF) occurring in voids and cavities that may form between aggregated primary particles and host water at relative humidity RHw 100%. Pores with D > 7.5 nm fill with water at RHi > 100% for T 235 K in particles that exhibit active sites for immersion freezing within pores. Most ice nucleation studies on clay minerals and mineral dusts indeed show a strong increase in ice nucleation efficiency when temperature is decreased below 235 K in accordance with PCF and are not explicable by the classical view of deposition nucleation. PCF is probably also the prevailing ice nucleation mechanism below water saturation for glassy, soot, and volcanic ash aerosols. No case could be identified that gives clear evidence of ice nucleation by water vapor deposition onto a solid surface.

Subfields: Atmospheric Science, Civil and Structural Engineering, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/445d4d95803bb7746d32a899241b9514f69d86f8

How researchers see this paper

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In Atmospheric Science

1. C. Hoose
2. M. Petters
3. Harald Saathoff
4. B. Murray
5. P. DeMott
6. M. Niemand
7. D. O’Sullivan
8. Richard H. Wagner

In Civil and Structural Engineering

1. C. Hoose
2. M. Niemand
3. Richard H. Wagner
4. K. Höhler
5. N. Hiranuma
6. R. Ullrich
7. Thomas Leisner
8. Harald Saathoff

In Global and Planetary Change

1. C. Hoose
2. M. Petters
3. Harald Saathoff
4. B. Murray
5. P. DeMott
6. M. Niemand
7. Richard H. Wagner
8. K. Höhler

Citations in the corpus

• Competition between water uptake and ice nucleation by glassy organic aerosol particles (2014, unknown): “To date, little is known about the exact microphysical mechanism by which amor- phous organics nucleate ice heterogeneously (Wagner et al., 2012; Marcolli, 2014; Schill et al., 2014).”
• A New Ice Nucleation Active Site Parameterization for Desert Dust and Soot (2017, methodology): “Near water saturation, water can condense in pores and cavities, and subsequently freezes, if cold enough, by the pore condensation and freezing (PCF) mechanism (Marcolli 2014; Wagner et al. 2016).”
• A comprehensive laboratory study on the immersion freezing behavior of illite NX particles. A comparison of 17 ice nucleation measurement techniques (2014, methodology): “The authors proposed this capillary condensation process as a part of condensation freezing or homogeneous nucleation based on the previous observation (Christenson, 2013) and the theoretical framework (Marcolli, 2014).”