Cloud halos: Numerical simulation of dynamical structure and radiative impact

Journal of Applied Meteorology | August 1, 2002| | Copyright

ABSTRACT

Significant enhancements in humidity around cumulus clouds, that is, the "cloud halos" observed in many aircraft penetrations, are simulated using a three-dimensional dynamic model. Five case studies show that humidity halos occur mainly near lateral cloud boundaries and also occur at cloud top and base when the cloud dissipates. The humidity halo broadens as the cloud ages and is also broader in the presence of wind shear than in its absence, especially on the downshear side of the cloud. The broadband calculation over the solar spectrum (0.2-Am) shows that the shortwave (SW) ...

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