Physics – Optics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3606803c&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 6, CiteID L06803
Physics
Optics
3
Radio Science: Remote Sensing, Atmospheric Composition And Structure: Cloud/Radiation Interaction, General Or Miscellaneous: Instruments Useful In Three Or More Fields, Atmospheric Composition And Structure: Instruments And Techniques, Atmospheric Composition And Structure: Cloud Optics
Scientific paper
The ability to determine the cloud boundaries and vertical distribution of cloud liquid water for single-layer liquid clouds using zenith-pointing microwave radiometers is investigated. Simulations are used to demonstrate that there is little skill in determining either cloud base or cloud thickness, especially when the cloud thickness is less than 500 m. It is also shown that the different distributions of liquid water content within a cloud with known cloud boundaries results in a maximum change in the brightness temperature of less than 1 K at the surface from 20 to 150 GHz, which is on the order of the instrument noise level. Furthermore, it is demonstrated using the averaging kernel that the number of degrees of freedom for signal (i.e., independent pieces of information) is approximately 1, which implies there is no information on vertical distribution of liquid water in the microwave observations.
Crewell Susanne
Ebell Kerstin
Löhnert Ulrich
Turner David D.
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