English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Abstract. A quality-controlled, 5-year dataset of aerosol numbersize distributions (particles with diameters (Dp) from 7 nm through 14 µm) was developed using observations from a scanning mobility particlesizer, aerodynamic particle sizer, and a condensation particle counter atthe Department of Energy's Southern Great Plains (SGP) site. This datasetwas used for two purposes. First, typical characteristics of the aerosolsize distribution (number, surface area, and volume) were calculated for theSGP site, both for the entire dataset and on a seasonal basis, and sizedistribution lognormal fit parameters are provided. While the median sizedistributions generally had similar shapes (four lognormal modes) in all theseasons, there were some significant differences between seasons. Thesedifferences were most significant in the smallest particles(Dp 800 nm).Second, power spectral analysis was conducted on this long-term dataset todetermine key temporal cycles of total aerosol concentrations, as well asaerosol concentrations in specified size ranges. The strongest cyclic signalwas associated with a diurnal cycle in total aerosol number concentrationsthat was driven by the number concentrations of the smallest particles(Dp&lt;30 nm). This diurnal cycle in the smallest particlesoccurred in all seasons in ∼50 % of the observations,suggesting a persistent influence of new particle formation events on thenumber concentrations observed at the SGP site. This finding is in contrast with earlierstudies that suggest new particle formation is observed primarily in thespringtime at this site. The timing of peak concentrations associated withthis diurnal cycle was shifted by several hours depending on the season,which was consistent with seasonal differences in insolation and boundarylayer processes. Significant diurnal cycles in number concentrations werealso found for particles with Dp between 140 and 800 nm, with peakconcentrations occurring in the overnight hours, which were primarilyassociated with both nitrate and organic aerosol cycles. Weaker cyclicsignals were observed for longer timescales (days to weeks) and arehypothesized to be related to the timescales of synoptic weathervariability. The strongest periodic signals (3.5–5 and 7 d cycles) forthese longer timescales varied depending on the season, with no cyclicsignals and the lowest variability in the summer.

Quantifying aerosol size distributions and their temporal variability in the Southern Great Plains, USA