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

. Biomass burning emits an estimated 25 % of globalannual nitrogen oxides (NOx), an important constituent thatparticipates in the oxidative chemistry of the atmosphere. Estimates ofNOx emission factors, representing the amount of NOx per massburned, are primarily based on field or laboratory case studies, but thesporadic and transient nature of wildfires makes it challenging to verifywhether these case studies represent the behavior of the global fires thatoccur on earth. Satellite remote sensing provides a unique view of theearth, allowing for the study of emissions and downwind evolution of NOxfrom a large number of fires. We describe direct estimates of NOxemissions and lifetimes for fires using an exponentially modified Gaussiananalysis of daily TROPOspheric Monitoring Instrument (TROPOMI) retrievals of NO2 tropospheric columns. We update the a priori profile of NO2 with a fine-resolution (0.25∘) global model simulation from NASA's GEOS Composition Forecasting System (GEOS-CF), which largely enhances NO2 columns over fire plumes. We derive representative NOx emission factors for six fuel types globally by linking TROPOMI-derived NOx emissions with observations of fire radiative power from Moderate Resolution Imaging Spectroradiometer (MODIS). Satellite-derived NOx emission factors are largely consistent with those derived from in situ measurements. We observe decreasing NOx lifetime with fire emissions, which we infer is due to the increase in both NOx abundance and hydroxyl radical production. Our findings suggest promise for applying space-based observations to track the emissions and chemical evolution of reactive nitrogen from wildfires.

atmospheric chemistry and physics

Direct estimates of biomass burning NO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;x&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt; emissions and lifetimes using daily observations from TROPOMI