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Comparison of Observed and Retrieved Downwelling Surface Radiation Using ASTEX Data

Lazarus, S.M., Krueger, S.K., and Frisch, A.S., University of Utah, National Oceanic and Atmospheric Administration-Environmental Technology Laboratory
Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting

We apply data obtained from the FIRE's (First International Satellite Cloud Climatology Project [ISCCP] Regional Experiment's) Atlantic Stratocumulus Transition Experiment (ASTEX). Estimates of the liquid water content (LWC) and effective radius (re) profiles are retrieved, assuming a lognormal model of the drop spectrum, using the liquid water path (LWP) measured from a Microwave Radiometer (MWR) and the reflectivity from a Millimeter Cloud Radar (MMCR) as inputs. The LWC and re profiles are then input into a delta-four- stream-based radiative transfer code with the output compared to ASTEX observations of surface downwelling infrared and solar fluxes. Radiative calculations during partly cloudy and overcast periods as well as multiple and single cloud layers are compared and examined. We also investigate the impact of errors in the re.

Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).