Optimized PM2.5 Source Profiles using CMAQ-ISAM and an updated seed profile incorporating California onroad mobile measurements

This dataset is a collection of optimized, chemically speciated PM2.5 source profiles for 5 sites in California over the month of January 2016. The sites are listed below: Site Name State AQS Site ID Latitude Longitude Bakersfield CA 06-029-0014 35.356092 -119.041209 Fresno CA 06-019-0011 36.785322 -119.774174 Modesto CA 06-099-0005 37.642165 -120.9942120 Sacramento CA 06-067-0006 38.613779 -121.368014 Visalia CA 06-107-2002 36.332179 -119.291228 All profiles used the same nonlinear optimization process as explained in Ivey et al. 2016, (doi.org/10.1007/s11783-016-0866-6) with the addition of two source sectors that incorporate aging of initial emissions into PM2.5. The sensitivity inputs for these profiles are 24-hour averaged CMAQ-ISAM data corresponding to the dates of CSN measurements collected at the five sites. All profiles use chemical speciation network (CSN) measurements collected over January 2016 at the sites in question as the observational component. The site and day-specific CMAQ-ISAM data can be found at https://doi.org/10.5281/zenodo.16914295. The "seed profile" used in the optimization process is also available in this dataset as "California_SeedProfile.csv" and uses speciated emissions data from Reff et al., (doi.org/10.1021/es802930x) as well as aged source impacts derived from CMAQ-DDM for AG (doi.org/10.1007/s11783-016-0866-6) and observations of organic nitrate and organosulfate molecular weights for BIO (doi.org/10.5194/acp-15-7307-2015). The profiles for on- and non-road diesel and gasoline emissions (ODE, OGA, NDE, and NGA) were updated using California-specific observations for onroad gasoline and diesel PM2.5 emissions accessed with EPA SPECIATE v5.3. The optimized profiles are provided without row or column labels, but this information can be found in the seed profile file. One profile file is uploaded for each day of available CSN observations at each of the five sites. The optimized profiles are normalized by source (i.e., the sum of all species contributions for one source must equal 1), and the units in the profile are grams of speciated PM2.5/gram of total PM2.5 from the source. The source categories used here are: Category name Description of included sources AG Agricultural activities and livestock operations AIR Aircraft operations BIO Biogenics COA Coal combustion DUS Dust FOI Fuel oil combustion MET Metals processing NDE Non-road diesel combustion NG Natural gas combustion NGA Non-road gasoline NRO Non-road combustion of other fuels ODE On-road diesel combustion OGA On-road gasoline combustion ORO On-road combustion of other fuels OTH All other sources RAL Rail operations RWC Residential wood combustion SHP Marine shipping operations SOL Solvent use