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 describe the first instrument for measurement of therate constant (s−1) for reactive loss (i.e., the total reactivity) ofNO3 in ambient air. Cavity-ring-down spectroscopy is used to monitorthe mixing ratio of synthetically generated NO3 ( ≈  30–50 pptv)after passing through a flow-tube reactor with variable residence time(generally 10.5 s). The change in concentration of NO3 upon modulationof the bath gas between zero air and ambient air is used to derive its lossrate constant, which is then corrected for formation and decomposition ofN2O5 via numerical simulation. The instrument is calibrated andcharacterized using known amounts of NO and NO2 and tested in thelaboratory with an isoprene standard. The lowest reactivity that can bedetected (defined by the stability of the NO3 source, instrumentalparameters and NO2 mixing ratios) is 0.005 s−1. An automateddilution procedure enables measurement of NO3 reactivities up to 45 s−1, this upper limit being defined mainly by the dilution accuracy.The typical total uncertainty associated with the reactivity measurement atthe center of its dynamic range is 16 %, though this is dependent onambient NO2 levels. Results from the first successful deployment of theinstrument at a forested mountain site with urban influence are shown andfuture developments outlined

Measurement of ambient NO&lt;sub&gt;3&lt;/sub&gt; reactivity: design, characterization and first deployment of a new instrument

Measurement of ambient NO<sub>3</sub> reactivity: design, characterization and first deployment of a new instrument