Precipitation Intensity and Cloud Physics

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Presentation transcript:

Precipitation Intensity and Cloud Physics Brad Eck April 26, 2007

Data Sources Precipitation Intensity Cloud Physics North American Regional Reanalysis (NARR) netCDF (thanks to Cedric) Units: kg/m^2/s  mm/s Cloud Physics Moderate Resolution Imaging Spectrometer (MODIS) Optical Thickness

Optical Thickness “…a measure of how opaque a medium is to radiation passing through it.” http://scienceworld.wolfram.com/physics/OpticalDepth.html “The (dimensionless) line integral of the absorption coefficient…along any path in a … medium.” http://amsglossary.allenpress.com/glossary/search?id=optical-thickness1

Source: King et. al., “Remote sensing of cloud, aerosol, and water vapor properties from the Moderate Resolution Imaging Spectrometer (MODIS),” IEEE Trans. Geosci. Remote Sens. 30, 2-27 (1992).

Sprechen Sie Englisch? Optical thickness combines droplet size, water content and cloud height to give a normalized cloud size Bigger clouds should have a higher precipitation intensity

May 2006