Campaign : CLASIC - SGP Particle Phase Experiment
2007.06.01 - 2007.06.22
Lead Scientist : Scot Martin
Description
Chemical composition and phase change properties of particles in the sizerange of 40-400 nm were measured using an aerosol mass spectrometer (Aerodyne HR-TOF-AMS) and a 1x3TDMA. The phase transitions of ambient atmospheric particles were measured by application of a novel 1by3 tandem differential mobility analyzer (1x3 TDMA), an instrument based upon the principle of the irreversibility of the hygroscopic growth factor when a phase transition occurs. The hypotheses, measurements, and analyses focused on the objective of providing cause-and-effect relationships between RH history and particle chemical composition on the one hand and particle phase on the other hand.
In addition to the 13 TDMA measurements, complimentary data at the SGP site was important in putting the observations into greater context and thereby understanding the cause-and-effect relationships between RH history and particle chemical composition and particle phase. Deployment of an aerosol mass spectrometer (Aerodyne HR-TOF-AMS) to the field site during the time of the intensive measurements along with the 13 TDMA provided aerosol chemistry data every few minutes (specifically, the organic-to-sulfate mass ratio and the nitrate-to-sulfate mass ratio).
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Co-Investigators
Qi Chen
Thomas Rosenoern
