26 October 2011 Application of a multifilter shadowband radiometer and microwave radiometer for ground based evaluation of aerosol-cloud interactions
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Abstract
The quantification of the first direct aerosol cloud interaction mechanism requires simultaneous observations of cloud water drop properties as well as aerosol properties below the cloud. The simultaneous measurement of both these properties is very difficult from space borne systems and efforts to develop ground remote sensing measurements are critical. To measure the cloud properties, we make use of an approach which combines a Microwave radiometer and a MFRSR radiometer for simultaneous Cloud Optical Depth (COD) and Liquid Water Path (LWP). From these measurements, effective droplet diameter can be estimated assuming the homogeneity of the cloud. In using the diffuse flux, we confirm that for COD > 2 and solar zenith angles < 60, the standard MFRSR correction can be applied with errors < 1%. In addition, we develop a method whereby regional retrieval of Microphysical properties from multispectral extinction measurements can be made based on NN based methods trained on full sky scans. Also, we discuss the uncertainty in the inferred COD due to various input parameters in the formation of Look-Up-Tables and present preliminary data sets for evaluation. Finally, we discuss methods to extract useful aerosol information during partly cloudy conditions that can be used to better define the state of the aerosol prior to cloud interaction.
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Barry Gross, Barry Gross, Lina Cordero, Lina Cordero, Julia He, Julia He, Bomidi Madhalvan, Bomidi Madhalvan, Fred Moshary, Fred Moshary, Sam Ahmed, Sam Ahmed, } "Application of a multifilter shadowband radiometer and microwave radiometer for ground based evaluation of aerosol-cloud interactions", Proc. SPIE 8177, Remote Sensing of Clouds and the Atmosphere XVI, 81770N (26 October 2011); doi: 10.1117/12.898366; https://doi.org/10.1117/12.898366
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