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- W3145054741 abstract "In order to better understand the characteristics and physical-to-radiative relationships of frozen hydrometeors in hurricane systems, computed brightness temperatures (TB) from 10.7 to 183k10 GHz were compared with radiometric observations of Hurricane Erin (2001) from the NASA ER-2 aircraft. The focus here is on the frozen particle microphysics and the high frequencies (2 85 GHz) that are particularly sensitive to frozen particles. In order to initialize the cloud profiles used in the radiative transfer calculations, data from airborne radars, dropsondes, and cloud models were used. Three different ice parameterizations were used with these cloud profiles to obtain the particle radiative signatures: (1) a solid ice sphere, (2) a low ice density (fluffy) sphere, and (3) a non-spherical bullet rosette habit where the radiation attributes (scattering, absorption, and asymmetry properties) are computed using the Discrete Dipole Approximation. All low frequency calculations match the observations reasonably well. For the higher frequencies, the solid ice spheres produced TBS that were too cold in most cases while the fluffy snow particle parameterizations produced Tns that were much warmer than the observations. The comparisons between the calculated and observed TBs show that in general the three dimensional rosette habit does the best job of matching the observations for most of the high frequencies primarily because of its asymmetry coefficients. Overall, this work shows that while non-spherical particles show promise, selecting and modeling a proper ice particle parameterization can be difficult and additional in situ measurements are needed to define and validate appropriate" @default.
- W3145054741 created "2021-04-13" @default.
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- W3145054741 date "2007-01-01" @default.
- W3145054741 modified "2023-09-25" @default.
- W3145054741 title "Nonspherical and Spherical Characterization of Ice in Hurricane Erin for Wideband Passive Microwave Comparisons" @default.
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