A Status Report and Update on the Microbase VAP

Maureen Dunn Brookhaven National Laboratory
Michael Jensen Brookhaven National Laboratory
Karen Johnson Brookhaven National Laboratory
Mark Miller Rutgers University
Eugene Clothiaux Pennsylvania State University
Gerald Mace University of Utah
Roger Marchand University of Washington
James Mather Pacific Northwest National Laboratory

Category: Cloud Properties

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Twenty minute average plots of ice water content from three different retrievals.

A complete description of the Microbase value-added product (VAP) is presented along with recent updates and improvements. This ARM product provides continuous profiles of the baseline cloud microphysical properties; liquid water content (LWC), ice water content (IWC), liquid effective radius (liqRe) and ice effective radius (iceRe). Microbase produces this information by incorporating observations from the millimeter cloud radar (MMCR), the ceilometer, the micropulse lidar (MPL), the microwave radiometer (MWR) and balloon-borne soundings. Profiles are calculated every 10 seconds and then averaged over 20-minute intervals with a vertical resolution of greater than 230 levels. The data are available for multiple years at all ARM Climate Research Facility (ACRF) fixed sites. NetCDF output files using the name “microbasepi” can be found in the ARM IOP archive. The algorithms employed within Microbase are explained and contrasted with those used in other, oftentimes conditional, microphysical products. These include the retrievals of Mace et al. (2006), Marchand et al. (2007), and Mather et al. (2007). Assumptions inherent in the various retrievals schemes are examined for relevancy and output from each is compared. Mace, GG, et al. 2006. “Cloud radiative forcing at the ARM Climate Research Facility: Part 1. technique, validation, and comparison to satellite-derived diagnostic quantities.” Journal of Geophysical Research 111, D11S90. Marchand, RT, et al. 2007. “An assessment of multi-angle imaging spectroRadiometer (MISR) stereo-derived cloud top heights and cloud top winds using ground-based radar, lidar and microwave radiometers.” Journal of Geophysical Research 112, D06204. Mather, JH, et al. 2007. "Cloud properties and associated radiative heating rates in the Tropical Western Pacific." Journal of Geophysical Research 112, D05201.

This poster will be displayed at ARM Science Team Meeting.

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