Organic aerosol composition and sources in Pasadena, California, during the 2010 CalNex campaign

The glyoxal budget and its contribution to organic aerosol for Los Angeles, California, during CalNex 2010

[1] Recent laboratory and field studies have indicated that glyoxal is a potentially large contributor to secondary organic aerosol mass. We present in situ glyoxal measurements acquired with a recently developed, high sensitivity spectroscopic instrument during the CalNex 2010 field campaign in Pasadena, California. We use three methods to quantify the production and loss of glyoxal in Los Ang...

Supplement of Fine particle pH and gas – particle phase partitioning of inorganic species in Pasadena , California , during the 2010 CalNex campaign

Droplet activation properties of organic aerosols observed at an urban site during CalNexLA

[1] Size-resolved cloud condensation nuclei (CCN) spectra and aerosol chemical composition were characterized at an urban supersite in Pasadena, California, from 15 May to 4 June 2010, during the CalNex campaign. The derived hygroscopicity (kCCN) of CCNactive particles with diameter between 97 and 165 nm ranged from 0.05 to 0.4. Diurnal variation showed a slight decrease of kCCN from 8:00 to 16...

Aerosol optical properties at Pasadena, CA during CalNex 2010

Aerosol optical properties measured at the Pasadena, CA site during the CalNex field campaign in May eJune 2010 are summarized. Average measurements of PM2.5 aerosol extinction, scattering, absorption coefficients, and single scattering albedo (bext, bscat, babs and SSA) at l 1⁄4 532 nmwere 62 Mm 1, 58 Mm 1, 4 Mm 1, and 0.92, respectively. The aerosol optical densities were 5 times lower than d...

Los Angeles Basin airborne organic aerosol characterization during CalNex

[1] We report airborne organic aerosol (OA) measurements over Los Angeles carried out in May 2010 as part of the CalNex field campaign. The principal platform for the airborne data reported here was the CIRPAS Twin Otter (TO); airborne data from NOAA WP-3D aircraft and Pasadena CalNex ground-site data acquired during simultaneous TO flybys are also presented. Aerodyne aerosol mass spectrometer ...

Sources of organic aerosol investigated using organic compounds as tracers measured during CalNex in Bakersfield

[1] To investigate the major sources of summertime organic aerosol (OA) and provide insights into secondary organic aerosol (SOA) formation, positive matrix factorization analysis was performed on a large set of organic species measured during the California at the Nexus of Air Quality and Climate Change (CalNex) campaign in Bakersfield, CA. Six OA source factors were identified, including one ...