Ultrafine aerosol formation and growth in a southern California desert

Ultrafine aerosol number-size distributions were collected in the northwestern Sonoran Desert from January 2018 to April 2019 to assess the frequency and intensity of particle formation and growth events in this region. Daily and seasonal patterns of particle formation and growth events were compared with meteorology, ozone mixing ratios, air mass back-trajectories, and modeled boundary layer height to determine potential environmental and anthropogenic influences. These were supplemented with measurements of gas-phase biogenic volatile organic compounds (BVOCs) during a period of active particle formation to gather insights into the potential role of condensation of highly oxidized organic molecules. Particle formation peaked in summer, trending with dominant westerly winds crossing the southern California megalopolis with correspondingly high ozone, higher peak solar radiation, and greater variability in planetary boundary layer h..., Date of data collection: 2018-01 to 2019-04
Geographic location of data collection:  Steele/Burnand Anza-Borrego Desert Reseach Center (33°14'25\"N 116°23'19\"W), Borrego Springs, CA USA.
Other details regarding these measurements can be found in the associated manuscript: Cramer K. L., Guenther, A. G., and Smith, J. N.: Ultrafine aerosol formation and growth in a southern California desert, Aerosol Science and Technology., # Data from: Ultrafine aerosol formation and growth in a southern California desert

Dataset DOI: [10.5061/dryad.xksn02vtv](10.5061/dryad.xksn02vtv)

## Description of the data and file structure

### Files and variables

#### File List:

* SBAB_Meteorology
* SBAB_Ozone
* SBAB_SizeDistribution_010518-032918
* SBAB_SizeDistribution_033018-051118
* SBAB_SizeDistribution_051118-062118
* SBAB_SizeDistribution_062118-082218
* SBAB_SizeDistribution_082218-101618
* SBAB_SizeDistribution_101618-040219

#### DATA-SPECIFIC INFORMATION FOR ALL DATA FILES:

**File: SBAB_Meteorology.csv**

Meteorological measurements collected between Jan 1, 2018, and Apr 2, 2019. Presented with variables: Datetime (PST), Average Windspeed (m/s), Wind Direction, Total Solar Radiation (W/m²), Average Relative Humidity (%), Rainfall (mm), Air Temperature (°C). The n/a values refer to data not available, indicating a lapse in measurement.

**File: SBAB_Ozone.csv**

Calculated average ozone (ppb) calculated from on ozon...,