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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report measurements of ambient amines and ammonia with a fast responsechemical ionization mass spectrometer (CIMS) in a southeastern US forestand a moderately polluted midwestern site during the summer. At the forestsite, mostly C3-amines (from pptv to tens of pptv) and ammonia (up to 2 ppbv) were detected, and they both showed temperature dependencies.Aerosol-phase amines measured thermal-desorption chemical ionization massspectrometer (TDCIMS) showed a higher mass fraction in the evening withcooler temperatures and lower in the afternoon with warmer temperatures, atrend opposite to the gas-phase amines. Concentrations of aerosol-phaseprimary amines measured with Fourier transform infrared spectroscopy (FTIR)from micron and submicron particles were 2 orders of magnitude higherthan the gas-phase amines. These results indicate that gas to particleconversion is one of the major processes that control the ambient amineconcentrations at this forest site. Temperature dependencies of C3-amines andammonia also imply reversible processes of evaporation of thesenitrogen-containing compounds from soil surfaces in daytime and depositionto soil surfaces at nighttime. During the transported biomass burning plumeevents, various amines (C1–C6) appeared at the pptv level, indicating thatbiomass burning is a substantial source of amines in thesoutheastern US. At the moderately polluted Kent site, there were higher concentrationsof C1- to C6-amines (pptv to tens of pptv) and ammonia (up to 6 ppbv). C1-to C3-amines and ammonia were well correlated with the ambient temperature.C4- to C6-amines showed frequent spikes during the nighttime, suggestingthat they were emitted from local sources. These abundant amines and ammoniamay in part explain the frequent new particle formation events reported fromKent. Higher amine concentrations measured at the polluted site than at therural forested site highlight the importance of constraining anthropogenicemission sources of amines

Atmospheric amines and ammonia measured with a chemical ionization mass spectrometer (CIMS)