edu.ucar.opensky::articles:7611 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:51:03.901419 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d70p10bw Hygroscopicity and volatility of 4-10 nm particles during summertime atmospheric nucleation events in urban Atlanta 2005-11-12T00:00:00Z publication https://n2t.org/ark:/85065/d70p10bw https://doi.org/10.1029/2005JD005918 Sakurai, H. author Fink, M. author McMurry, P. author Mauldin, Roy author Moore, Katharine author Smith, James N. author Eisele, Fred author UCAR/NCAR - Library publisher Continuous measurements of hygroscopicity and volatility of atmospheric aerosol particles of 4 - 10 nm diameter were conducted with a nanometer tandem differential mobility analyzer ( Nano TDMA) during the Aerosol Nucleation and Real-time Characterization Experiment ( ANARChE), which took place in Atlanta in July and August 2002. In the Nano TDMA measurements, particles were exposed to either a high humidity ( similar to 90% RH) or an elevated temperature ( similar to 100 degrees C) downstream of the first differential mobility analyzer (DMA) and were then resized by the second DMA to determine the change in size due to water uptake or evaporation. There were several days when nucleation occurred and high concentrations of sub-20 nm particles were observed, and during those events, particles of 4 - 10 nm diameter were very hygroscopic and nonvolatile. These observations, together with parallel Thermal Desorption Chemical Ionization Mass Spectrometer (TDCIMS) measurements of sub-20 nm particle composition, suggest that the particles were mostly composed of ammoniated sulfates. This finding strongly supports the hypothesis that the nucleation and subsequent growth of nanoparticles were driven by reactions involving sulfuric acid and ammonia during this study. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2005 American Geophysical Union. None eng geoscientificInformation