characteristics of the raindrop distributions in rico shallow cumulus
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ID: 254473
2014
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Abstract
The physical properties of rain spectra are generally modeled using an
analytical distribution. It is common for the gamma distribution and, to a
lesser extent, the lognormal distribution to be used. The majority of studies
in the literature focusing on the characterization of raindrop distribution
are based on deep convective cloud observations, mostly at ground level.
This study focuses on shallow-cumulus rain distributions throughout the
depth of the cloud layer and subcloud layer using airborne in situ
measurements made with both the Particle Measuring Systems (PMS) Optical Array Probe 260X (OAP-260-X) and the PMS two-Dimensional Precipitation (2DP) instruments
during the Rain in Cumulus over the Ocean (RICO) field experiment. Sampled spectra analyzed on the scale of
large-eddy simulation resolution (100 m) are found to be relatively broad, with values of the
shape parameter – υ for the gamma law and σg for the
lognormal law – on the order of 1–3 and 1.5–2, respectively. The dependence
of the shape parameters on the main rain variables (number concentration,
water content, mean volume diameter, sedimentation fluxes and radar
reflectivity) is examined, and a parameterization of the shape parameters
υ and σg as a function of a power law of the
rainwater content and raindrop number concentration is proposed.
| Reference Key |
geoffroy2014atmosphericcharacteristics
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|---|---|
| Authors | ;O. Geoffroy;A. P. Siebesma;F. Burnet |
| Journal | Journal of agricultural and food chemistry |
| Year | 2014 |
| DOI |
10.5194/acp-14-10897-2014
|
| URL | |
| Keywords |
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