HR: 0800h
AN: A11B-0378    [Abstracts]
TI: Airborne Measurements of Aerosol Size Distributions During PACDEX
AU: Rogers, D C
EM: dcrogers@ucar.edu
AF: NCAR, P.O. Box 3000, Boulder, CO 80307, United States
AU: Gandrud, B
EM: gandrud@dropletmeasurement.com
AF: Droplet Measuring Technologies, 5710 Flatiron Parkway Suite B, Boulder, CO 80301, United States
AU: Campos, T
EM: campos@ucar.edu
AF: NCAR, P.O. Box 3000, Boulder, CO 80307, United States
AU: Kok, G
EM: glkok@dropletmeasurement.com
AF: Droplet Measuring Technologies, 5710 Flatiron Parkway Suite B, Boulder, CO 80301, United States
AU: * Stith, J
EM: stith@ucar.edu
AF: NCAR, P.O. Box 3000, Boulder, CO 80307, United States
AB: The Pacific Dust Experiment (PACDEX) is an airborne project that attempts to characterize the indirect aerosol effect by tracing plumes of dust and pollution across the Pacific Ocean. This project occurred during April-May 2007 and used the NSF/NCAR HIAPER research aircraft. When a period of strong generation of dust particles and pollution was detected by ground-based and satellite sensors, then the aircraft was launched from Colorado to Alaska, Hawaii, and Japan. Its mission was to intercept and track these plumes from Asia, across the Pacific Ocean, and ultimately to the edges of North America. For more description, see the abstract by Stith and Ramanathan (this conference) and other companion papers on PACDEX. The HIAPER aircraft carried a wide variety of sensors for measuring aerosols, cloud particles, trace gases, and radiation. Sampling was made in several weather regimes, including clean "background" air, dust and pollution plumes, and regions with cloud systems. Altitude ranges extended from 100 m above the ocean to 13.4 km. This paper reports on aerosol measurements made with a new Ultra-High Sensitivity Aerosol Spectrometer (UHSAS), a Radial Differential Mobility Analyzer (RDMA), a water-based CN counter, and a Cloud Droplet Probe (CDP). These cover the size range 10 nm to 10 um diameter. In clear air, dust was detected with the UHSAS and CDP. Polluted air was identified with high concentrations of carbon monoxide, ozone, and CN. Aerosol size distributions will be presented, along with data to define the context of weather regimes.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting