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Representing Cloud Processing of Aerosol in Numerical Models

Description: The satellite imagery in Figure 1 provides dramatic examples of how aerosol influences the cloud field. Aerosol from ship exhaust can serve as nucleation centers in otherwise cloud-free regions, forming ship tracks (top image), or can enhance the reflectance/albedo in already cloudy regions. This image is a demonstration of the first indirect effect, in which changes in aerosol modulate cloud droplet radius and concentration, which influences albedo. It is thought that, through the effects it h… more
Date: March 18, 2005
Creator: Mechem, D.B. & Kogan, Y.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Scale Dependence of Variability in Stratiform Clouds Based on Millimeter Wave Could Radar

Description: Internal variability of stratiform clouds is manifested on grid scales ranging from cloud resolving models to general circulation models, and its accurate formulation is one of the most important tasks in improvement of model predictions. Understanding cloud variability on different scales will help to develop and improve subgrid-scale cloud parameterizations. Information about variability is also crucial when dealing with retrieval of microphysical information from observations of volume avera… more
Date: March 18, 2005
Creator: Kogan, Z.N.; Kogan, Y.L. & Mechem, D.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Toward a Diurnal Climatology of Cold-Season Turbulence Statistics in Continental Stratocumulus as Observed by the Atmospheric Radiation Millimeter- Wavelength Cloud Radars

Description: Numerous observational studies of marine stratocumulus have demonstrated a pronounced diurnal cycle. At night, longwave flux divergence at the top of the cloud drives negatively buoyant eddies that tend to keep the boundary layer well mixed. During the day, solar absorption by the cloud tends to reduce the turbulent intensity and often decouples the planetary boundary layer (PBL) into cloud- and sub-cloud circulations. The delicate balance between turbulent intensity, entrainment, and fluxes di… more
Date: March 18, 2005
Creator: Mechem, D. B.; Kogan, Y. L.; Childers, M. E. & Donner, K. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multi-Dimensional Broadband IR Radiative Forcing of Marine Stratocumulus in a Large Eddy Simulation Model

Description: In order to address the interactive and evolutionary nature of the cloud-radiation interaction, we have coupled to a Large Eddy Simulation (LES) model the sophisticated multi-dimensional radiative transfer (MDRT) scheme of Evans (Spherical Harmonics Discrete Ordinate Method; 1998). Because of computational expense, we are at this time only able to run 2D experiments. Preliminary runs consider only the broadband longwave component, in large part because IR cloud top cooling is the significant fo… more
Date: June 3, 2002
Creator: Mechem, David B.; Ovtchinnikov, Mikhail; Kogan, Y. L.; Davis, Anthony B; Cahalan, Robert F.; Takara, Ezra E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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