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

. Residential wood combustion remains one of the most important sources ofprimary organic aerosols (POA) and secondary organic aerosol (SOA)precursors during winter. The overwhelming majority of these precursors have not been traditionally considered in regional models, and only recently were lignin pyrolysis products and polycyclic aromatics identified as theprincipal SOA precursors from flaming wood combustion. The SOA yields ofthese components in the complex matrix of biomass smoke remain unknown andmay not be inferred from smog chamber data based on single-compound systems.Here, we studied the ageing of emissions from flaming andsmoldering-dominated wood fires in three different residential stoves,across a wide range of ageing temperatures (−10, 2and 15 ∘C) and emission loads. Organic gases (OGs) acting as SOAprecursors were monitored by a proton-transfer-reaction time-of-flight massspectrometer (PTR-ToF-MS), while the evolution of the aerosol propertiesduring ageing in the smog chamber was monitored by a high-resolutiontime-of-flight aerosol mass spectrometer (HR-ToF-AMS). We developed a novelbox model based on the volatility basis set (VBS) to determine thevolatility distributions of the oxidation products from different precursorclasses found in the emissions, grouped according to their emission pathwaysand SOA production rates. We show for the first time that SOA yields incomplex emissions are consistent with those reported in literature fromsingle-compound systems. We identify the main SOA precursors in both flamingand smoldering wood combustion emissions at different temperatures. Whilesingle-ring and polycyclic aromatics are significant precursors in flamingemissions, furans generated from cellulose pyrolysis appear to be importantfor SOA production in the case of smoldering fires. This is especially thecase at high loads and low temperatures, given the higher volatility offuran oxidation products predicted by the model. We show that the oxidationproducts of oxygenated aromatics from lignin pyrolysis are expected todominate SOA formation, independent of the combustion or ageing conditions,and therefore can be used as promising markers to trace ageing of biomasssmoke in the field. The model framework developed herein may begeneralizable for other complex emission sources, allowing determination ofthe contributions of different precursor classes to SOA, at a level ofcomplexity suitable for implementation in regional air quality models.

Secondary organic aerosol formation from smoldering and flaming combustion of biomass: a box model parametrization based on volatility basis set