DOI: 10.1002/2017MS001226
Scopus记录号: 2-s2.0-85045287192
论文题名: Representing Precipitation Ice Species With Both Spherical and Nonspherical Particles for Radiative Transfer Modeling of Microphysics-Consistent Cloud Microwave Scattering Properties
作者: Sieron S ; B ; , Zhang F ; , Clothiaux E ; E ; , Zhang L ; N ; , Lu Y
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
语种: 英语
英文关键词: Hurricanes
; Luminance
; Particle size
; Radiative transfer
; Snow
; Storms
; Temperature
; CRTM
; Ice particles
; Nonspherical particle
; Radiative transfer model
; Tropical cyclone
; Spheres
英文摘要: Cloud microwave scattering properties for the Community Radiative Transfer Model (CRTM) have previously been created to be consistent with the particle size distributions specified by the WSM6 single-moment microphysics scheme. Here substitution of soft sphere scattering properties with nonspherical particle scattering properties is explored in studies of Hurricane Karl (2010). A nonsphere replaces a sphere of the same maximum dimension, and the number of particles of a given size is scaled by the ratio of the sphere to nonsphere mass to keep the total mass of a given particle size unchanged. The replacement of homogeneous soft sphere snow particles is necessary to resolve a highly evident issue in CRTM simulations: precipitation-affected brightness temperatures are generally warmer at 183 GHz than at 91.7 GHz, whereas the reverse is seen in observations. Using sector snowflakes resolve this issue better than using columns/plates, bullet rosettes, or dendrites. With sector snowflakes, both of these high frequencies have low simulated brightness temperatures compared to observations, providing a clear and consistent suggestion that snow is being overproduced in the examined simulation using WSM6 microphysics. Graupel causes cold biases at lower frequencies which can be reduced by either reducing graupel water contents or replacing the microphysics-consistent spherical graupel particles with sector snowflakes. However, soft spheres are likely the better physical representation of graupel particles. The hypotheses that snow and graupel are overproduced in simulations using WSM6 microphysics shall be examined more systematically in future studies through additional cases and ensemble data assimilation of all-sky microwave radiance observations. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75669
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Meteorology and Atmospheric Scienceand Center for Advanced Data Assimilation and Predictability Techniques, Pennsylvania State UniversityUniversity Park, PA USA; State College Area High SchoolState College, PA USA
Recommended Citation:
Sieron S,B,, Zhang F,et al. Representing Precipitation Ice Species With Both Spherical and Nonspherical Particles for Radiative Transfer Modeling of Microphysics-Consistent Cloud Microwave Scattering Properties[J]. Journal of Advances in Modeling Earth Systems,2018-01-01