AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
In-situ Comparison of SFCA to Constant Flow Operation of Two CCNcs during KORUS-AQ
JAMES HITE, Andreas Beyersdorf, Chelsea Corr, Edward Winstead, Kenneth Thornhill, Bruce Anderson, Athanasios Nenes, Georgia Institute of Technology
Abstract Number: 760 Working Group: Instrumentation and Methods
Abstract Scanning flow CCN analysis (SFCA) is a mode of operation for the Droplet Measurement Technologies (DMT) Continuous-Flow Streamwise Thermal-Gradient Cloud Condensation Nuclei Counter (CCNc). This method has been utilized on airborne platforms many times providing high temporal resolution CCN concentrations at a range of supersaturations. The supersaturation is controlled by the flowrate through the column rather than the temperature gradient, as with standard (i.e. constant flow) operation. During the summer 2016 KORUS-AQ field deployment, two CCNcs were in the payload of the DC-8. One was operated in an SFCA mode and the other was operated at constant flow for a single supersaturation (nominally 0.6%). This work presents the results of a first ever direct comparison of SFCA to constant flow operation with ambient flight data and demonstrates the successful agreement between the two measurements. Recommendations for the supersaturation calibration and other limitations are also discussed.