Reply to Yang et al.: Biomass burning is an important tropospheric source of ozone in remote regions of the globe

Peischl, J.; Bourgeois, Ilann; Brown, Steven S.; Neuman, J. Andrew

doi:10.1073/pnas.2212326119

Cited by 2 publications

(1 citation statement)

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“…The debate on the importance of stratospheric intrusions vs. biomass burning as potential pathways for the pollutant (e.g., ozone) transport to the HTP has been ongoing. 21,[59][60][61] It is possible that spatial variability in the extent of inuence of stratospheric intrusions 21,41 is a likely factor leading to the observed signicant association of S-MIF with biomass burning. This along with reports on high spatial variability of biomass burning aerosols on the HTP 62 further corroborates the ndings here.…”

Section: Papermentioning

confidence: 99%

Tracing the origin of elevated springtime atmospheric sulfate on the southern Himalayan-Tibetan plateau

Dasari

Paris

Pei

et al. 2023

Environ. Sci.: Adv.

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Section: Papermentioning

confidence: 99%

Tracing the origin of elevated springtime atmospheric sulfate on the southern Himalayan-Tibetan plateau

Dasari

Paris

Pei

et al. 2023

Environ. Sci.: Adv.

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Tropospheric Ozone During the Last Interglacial

Yan

Banerjee

Murray

et al. 2022

Geophysical Research Letters

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Human activities have modified the atmosphere's composition since the Industrial Revolution in the 18th century, if not earlier (Ruddiman et al., 2020). While anthropogenic impacts on carbon dioxide and other long-lived greenhouse gases are well constrained (Rubino et al., 2019), much less is known about the human influence on atmospheric oxidation chemistry, and in particular, on tropospheric ozone (O 3 ).The most important photochemical cycle in the tropospheric O 3 budget involves nitrogen oxides (NO x = NO + NO 2 ) and volatile organic compounds (VOCs; here including methane and ethane). Photolysis of NO 2 produces atomic oxygen, which can react with molecular O 2 to form O 3 . This O 3 can also oxidize NO to form NO 2 and O 2 :(1)In low-NO x environments, this null photochemical cycle explains basic trends in ozone mixing ratios (Jacob, 1999). At steady state, the O 3 mixing ratio determined by this set of reactions, [O 3_ss ], can be expressed as:Here, J NO2 is the photodissociation rate of NO 2 , and k NO+O3 is the rate coefficient for Equation 3. Equation 4reveals that steady-state O 3 mixing ratios scale with the [NO 2 ]/[NO] ratio. The atmospheric oxidation of VOCs and carbon monoxide (CO) can increase the [NO 2 ]/[NO] ratio in low-NO x environments, elevating O 3 mixing ratios in both urban and remote atmospheres. The increasing use of fossil fuels over the late 20th century has led to the increases in the emission of NO x , VOCs, and CO into the atmosphere (Faïn et al., 2022;Rubino et al., 2019) and ultimately an increase in the observed tropospheric O 3 burden (Archibald et al., 2020).

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Reply to Yang et al.: Biomass burning is an important tropospheric source of ozone in remote regions of the globe

Cited by 2 publications

References 2 publications

Tracing the origin of elevated springtime atmospheric sulfate on the southern Himalayan-Tibetan plateau

Tracing the origin of elevated springtime atmospheric sulfate on the southern Himalayan-Tibetan plateau

Tropospheric Ozone During the Last Interglacial

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