Publication Abstracts

Van Diedenhoven et al. 2020

Van Diedenhoven, B., A.S. Ackerman, A.M. Fridlind, B. Cairns, and J. Riedi, 2020: Global statistics of cloud top ice microphysical and optical properties. J. Geophys. Res. Atmos., 125, no. 6, e2019JD031811, doi:10.1029/2019JD031811.

The sizes and shapes of ice crystals in clouds affect fundamental microphysical processes, such as sedimentation and aggregation, as well as their optical properties. The evolution of ice crystal size and shape depends on temperature and supersaturation, as well as on other processes that may lead to various coexisting complex shapes. Here we present a global assessment of collocated size and shape characteristics and shortwave scattering properties of ice crystals at the tops of optically thick clouds inferred from space-borne multi-wavelength reflectance measurements and multi-angle polarimetry. The results indicate systematic covariations of ice size, shape and distortion, as well as variations with temperature that can be plausibly related to simplified ice crystal growth theory and in situ and laboratory data. This simplicity may be attributable to the temperature dependence of cloud top ice size and shapes commonly being dominated by vapor growth at conditions similar to those at cloud top. Such a conclusion may be viewed as somewhat surprising given the expectation that ice properties at cloud top will be an integral manifestation of processes occurring at lower levels within updrafts. We also find that, contrary to commonly used models, ice scattering asymmetry parameters decrease with increasing effective radius, reducing sensitivity of cloud reflectance to particle size.

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BibTeX Citation

  author={van Diedenhoven, B. and Ackerman, A. S. and Fridlind, A. M. and Cairns, B. and Riedi, J.},
  title={Global statistics of cloud top ice microphysical and optical properties},
  journal={J. Geophys. Res. Atmos.},

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RIS Citation

ID  - va09300n
AU  - van Diedenhoven, B.
AU  - Ackerman, A. S.
AU  - Fridlind, A. M.
AU  - Cairns, B.
AU  - Riedi, J.
PY  - 2020
TI  - Global statistics of cloud top ice microphysical and optical properties
JA  - J. Geophys. Res. Atmos.
VL  - 125
IS  - 6
SP  - e2019JD031811
DO  - 10.1029/2019JD031811
ER  -

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