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

The oxygen isotopic composition (Δ17O) of atmospheric nitrateis a function of the relative abundance of atmospheric oxidants (O3,ROx=OH+HO2+RO2) and the formation pathway of nitratefrom its precursor NOx (=NO+NO2). Coupled observations andmodeling of nitrate Δ17O can be used to quantify the relativeimportance of chemical formation pathways leading to nitrate formation andreduce uncertainties in the budget of reactive nitrogen chemistry in theatmosphere. We present the first global model of atmospheric nitrate Δ17O and compare with available observations. The largest uncertaintyfor calculations of nitrate Δ17O is the unconstrainedvariability in the Δ17O value of tropospheric ozone. The modelshows the best agreement with a global compilation of observations whenassuming a Δ17O value of tropospheric ozone equal to 35‰ andpreferential oxidation of NOx by the terminal oxygen atoms of ozone.Calculated values of annual-mean nitrate Δ17O in the lowestmodel layer (0–200 m above the surface) vary from 7‰ in the tropics to41‰in the polar-regions. The global, annual-mean tropospheric inorganic nitrateburden is dominated by nitrate formation via NO2+OH (76%),followed by N2O5 hydrolysis (18%) and NO3+DMS/HC(4%). Calculated nitrate Δ17O is sensitive to the relativeimportance of each nitrate formation pathway, suggesting that observationsof nitrate Δ17O can be used to quantify the importance ofindividual reactions (e.g. N2O5 hydrolysis) leading to nitrateformation if the Δ17O value of ozone is known

atmospheric chemistry and physics

Quantifying atmospheric nitrate formation pathways based on a global model of the oxygen isotopic composition (Δ&amp;lt;sup&amp;gt;17&amp;lt;/sup&amp;gt;O) of atmospheric nitrate