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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

. Deep convective clouds are critically important to the distribution ofatmospheric constituents throughout the troposphere but are difficultenvironments to study. The Deep Convective Clouds and Chemistry (DC3) studyin 2012 provided the environment, platforms, and instrumentation to testoxidation chemistry around deep convective clouds and their impacts downwind.Measurements on the NASA DC-8 aircraft included those of the radicalshydroxyl (OH) and hydroperoxyl ( HO2 ), OH reactivity, and more than100 other chemical species and atmospheric properties. OH, HO2 , andOH reactivity were compared to photochemical models, some with and somewithout simplified heterogeneous chemistry, to test the understanding ofatmospheric oxidation as encoded in the model. In general, the agreementbetween the observed and modeled OH, HO2 , and OH reactivity waswithin the combined uncertainties for the model without heterogeneouschemistry and the model including heterogeneous chemistry with small OH and HO2 uptake consistent with laboratory studies. This agreement isgenerally independent of the altitude, ozone photolysis rate, nitric oxideand ozone abundances, modeled OH reactivity, and aerosol and ice surfacearea. For a sunrise to midday flight downwind of a nighttime mesoscaleconvective system, the observed ozone increase is consistent with thecalculated ozone production rate. Even with some observed-to-modeleddiscrepancies, these results provide evidence that a currentmeasurement-constrained photochemical model can simulate observed atmosphericoxidation processes to within combined uncertainties, even around convectiveclouds. For this DC3 study, reduction in the combined uncertainties would beneeded to confidently unmask errors or omissions in the model chemicalmechanism.

Atmospheric oxidation in the presence of clouds during the Deep Convective Clouds and Chemistry (DC3) study