Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 5, Pages 1599-1605Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062729
Keywords
homogeneous nucleation; ice nucleation; cloud glaciation; droplet freezing; mixed-phase clouds; cloud ice
Categories
Funding
- European Research Council [240449 ICE]
- Natural Environment Research Council [NE/I013466/1, NE/I020059/1, NE/K004417/1]
- DFG research unit [FOR-1525 (INUIT), KO 2944/2-1]
- NERC [NE/I020059/1, NE/I013466/1, NE/K004417/1] Funding Source: UKRI
- Natural Environment Research Council [NE/I013466/1] Funding Source: researchfish
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Water droplets in some clouds can supercool to temperatures where homogeneous ice nucleation becomes the dominant freezing mechanism. In many cloud resolving and mesoscale models, it is assumed that homogeneous ice nucleation in water droplets only occurs below some threshold temperature typically set at -40 degrees C. However, laboratory measurements show that there is a finite rate of nucleation at warmer temperatures. In this study we use a parcel model with detailed microphysics to show that cloud properties can be sensitive to homogeneous ice nucleation as warm as -30 degrees C. Thus, homogeneous ice nucleation may be more important for cloud development, precipitation rates, and key cloud radiative parameters than is often assumed. Furthermore, we show that cloud development is particularly sensitive to the temperature dependence of the nucleation rate. In order to better constrain the parameterization of homogeneous ice nucleation laboratory measurements are needed at both high (>-35 degrees C) and low (<-38 degrees C) temperatures.
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