AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Ground-Based Measurements of CCN Concentrations in Singapore
SAMUEL ATWOOD, Sonia Kreidenweis, Jeffrey Reid, Shiguo Jia, Wei Hong Fan, Liya Yu, Colorado State University
Abstract Number: 506 Working Group: Urban Aerosols
Abstract A size resolved CCN system was deployed in a rooftop laboratory in Singapore in boreal summer/fall 2012 and again in spring 2013 to measure ambient aerosol hygroscopicity and size distributions as part of the on-going Seven SouthEast Asian Studies (7SEAS) field campaign. Potential aerosol sources in the region range from local anthropogenic pollution associated with industry, vehicles, and heavy shipping traffic, to marine sea salt, and long range transport of smoke from seasonal biomass burning in Southeast Asia and the Maritime Continent. However, measurements were limited to dry particle sizes smaller than 500 nm, where the majority of the CCN number concentration resides. Variations in CCN concentrations reflect both changing meteorology and changes in local and regional sources, including transboundary biomass burning smoke in the region. Potential aerosol source regions are considered through use of the HYSPLIT backtrajectory model at several heights both within and above the boundary layer.