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Comparison of In-Situ, Airborne and Surface Remote Sensing of Cloud Droplet Size and Liquid Water Path Over SGP CART During the Aerosol IOP

Pilewskie, P.(a), Feingold, G.(b), Wendisch, M.(c), and Jonsson, H.(d), Ames Research Center (a), NOAA/ETL (b), Institute for Tropospheric Research, Leipzig (c), NPS/CIRPAS (d)
Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting

We provide results from optical remote sensing of cloud droplet size, cloud optical depth, and liquid water path and compare with surface retrievals using combined microwave radiometer and radar data. In-situ aircraft data are also available for comparison. The retrievals are interpreted with respect to sensor field of view and sampling frequency, as well as general considerations for the information content in the data from each of the surface and airborne sensors. Initial results from these independent methods appear promising and provide confidence in the use of the radar/microwave radiometer method of estimating drop sizes. We show that by combining these surface-based drop size retrievals with aerosol information from lidar or surface instruments we can provide estimates of the magnitude of the Twomey indirect effect of aerosol radiative forcing.

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