Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-3499-2010 http://www.atmos-chem-phys-discuss.net/10/3499/2010/ http://www.atmos-chem-phys-discuss.net/10/3499/2010/acpd-10-3499-2010.html http://www.atmos-chem-phys-discuss.net/10/3499/2010/acpd-10-3499-2010.pdf 3499 3546 2010-02-09 Characterization of particle cloud droplet activity and composition in the free troposphere and the boundary layer during INTEX-B G. C. Roberts gcroberts@ucsd.edu D. A. Day L. M. Russell E. J. Dunlea J. L. Jimenez J. M. Tomlinson D. R. Collins Y. Shinozuka A. D. Clarke Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, USA Cooperative Institute for Research in the Environmental Sciences (CIRES), Boulder, CO, USA Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USA School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI, USA now at: Pacific Northwest National Laboratory, Richland, WA, USA now at: NASA Ames Research Center, Moffett Field, CA, USA Measurements of cloud condensation nuclei (CCN), aerosol size distributions, and submicron aerosol composition were made as part of the Intercontinental Chemical Transport Experiment Phase B (INTEX-B) campaign during spring 2006. Measurements were conducted from an aircraft platform over the Northeastern Pacific and Western North America with a focus on how the transport and evolution of Asian pollution across the Pacific Ocean affected CCN properties. A broad range of air masses were sampled and here we focus on three distinct air mass types defined geographically: the Pacific free troposphere (FT), the marine boundary layer (MBL), and the polluted continental boundary layer in the California Central Valley (CCV). These observations add to the few observations of CCN in the FT. CCN concentrations showed a large range of concentrations between air masses, however CCN activity was similar for the MBL and CCV (κ~0.2–0.25). FT air masses showed evidence of long-range transport from Asia and CCN activity was consistently higher than for the boundary layer air masses. Bulk chemical measurements predicted CCN activity reasonably well for the CCV and FT air masses. 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