نتایج جستجو برای: cloud microphysics

تعداد نتایج: 87468  

2009
Yoo-Jeong Noh Thomas H. Vonder Haar

Better understanding of the vertical structures of clouds in the atmosphere is essential for more accurate radar, lidar, satellite retrievals, climate/weather numerical modeling, and even aviation safety issues regarding icing conditions (Fleishauer et al., 2002). However, an accurate estimate of liquid and ice phase hydrometeors in the clouds is still very challenging, and our limited knowledg...

2011
Pavlos Kollias Jasmine Rémillard Edward Luke Wanda Szyrmer

[1] Several aspects of spectral broadening and drizzle growth in shallow liquid clouds remain not well understood. Detailed, cloud‐scale observations of microphysics and dynamics are essential to guide and evaluate corresponding modeling efforts. Profiling, millimeter‐wavelength (cloud) radars can provide such observations. In particular, the first three moments of the recorded cloud radar Dopp...

Journal: :Science 2006
P Rannou F Montmessin F Hourdin S Lebonnois

Clouds have been observed recently on Titan, through the thick haze, using near-infrared spectroscopy and images near the south pole and in temperate regions near 40 degrees S. Recent telescope and Cassini orbiter observations are now providing an insight into cloud climatology. To study clouds, we have developed a general circulation model of Titan that includes cloud microphysics. We identify...

2008
U. Lohmann

Aerosols affect the climate system by changing cloud characteristics in many ways. They act as cloud condensation and ice nuclei and may have an influence on the hydrological cycle. Here we investigate aerosol effects on convective clouds by extending the double-moment cloud microphysics scheme developed for stratiform clouds, which is coupled to the HAM double-moment aerosol scheme, to convect...

2018
Zheng Gao Yangang Liu Xiaolin Li Chunsong Lu

13 A new particle-resolved three dimensional direct numerical simulation (DNS) model is 14 developed that combines Lagrangian droplet tracking with the Eulerian field representa15 tion of turbulence near the Kolmogorov microscale. Six numerical experiments are per16 formed to investigate the processes of entrainment of clear air and subsequent mixing with 17 cloudy air and their interactions wi...

2015
Paulo Ceppi Dennis L. Hartmann Mark J. Webb

Increases in cloud optical depth and liquid water path (LWP) are robust features of global warming model simulations in high latitudes, yielding a negative shortwave cloud feedback, but the mechanisms are still uncertain. We assess the importance of microphysical processes for the negative optical depth feedback by perturbing temperature in the microphysics schemes of two aquaplanet models, bot...

2005
Youngsun Jung Ming Xue Jerry M. Straka

Since the use of differential reflectivity for rainfall estimation was first proposed by Seliga and Bringi (1976), many studies have shown that polarimetric measurements can improve precipitation type classification and quantitative precipitation estimate (Straka et al. 2000). Moreover, the polarimetric radar (PR) upgrade plan of the National Weather Services (NWS) for the operational WSR-88D n...

2015
Yujie Pan Ming Xue Guoqing Ge

In this study, a new set of reflectivity equations is introduced into the ARPS (Advanced Regional Prediction System) cloud analysis system. This set of equations incorporates double moment microphysics information in the analysis by adopting a set of diagnostic relationships between the intercept parameters and the corresponding mass mixing ratios. A reflectivityand temperature-based graupel cl...

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