Effects of ozone isotopologue formation on the clumped-isotope composition of atmospheric O2

Yeung, Laurence Y.; Murray, Lee T.; Banerjee, Asmita; Tie, Xin; Yan, Yuzhen; Atlas, Elliot L.; Schauffler, S.; Boering, K. A.

doi:10.1002/essoar.10506248.2

Cited by 2 publications

(4 citation statements)

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“…The atmospheric chemistry portion of the model includes the effects of both pressure and temperature on Δ 36 values, and successfully reproduces modern atmospheric observations when coupled with reanalysis meteorology (Yeung et al., 2021). This online output includes grid‐scale simulated atmospheric Δ 36 values as well as synthetic tracers corresponding to endmember Δ 36 values of O 2 that have been reordered only in the troposphere or stratosphere.…”

Section: Methodsmentioning

confidence: 79%

“…Clumped isotopes of O 2 (Δ 36 ) in air trapped in ice cores, which reflect global‐scale trends in O 3 photochemistry (Yeung et al., 2016, 2021), provide distinct information about the tropospheric O 3 burden during the Last Interglacial. The inferred 9% reduction (95% CI: 3%–15%) of tropospheric O 3 in the LIG compared to the late Holocene was likely due to a shift in the global fire regime, though other factors might also contribute.…”

Section: Discussionmentioning

confidence: 99%

“…This online output includes grid‐scale simulated atmospheric Δ 36 values as well as synthetic tracers corresponding to endmember Δ 36 values of O 2 that have been reordered only in the troposphere or stratosphere. Together, these quantities can be leveraged to estimate effective isotope exchange rates in the troposphere and stratosphere‐troposphere exchange fluxes using the following formula (Banerjee et al., 2022; Yeung et al., 2021):

{{\Delta}}_{36,\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{p}}=\left(\frac{{E}_{\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{p}}}{{F}_{\mathrm{S}\mathrm{T}}+{E}_{\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{p}}}\right)\times {{\Delta}}_{36,t}+\left(\frac{{F}_{\mathrm{S}\mathrm{T}}}{{F}_{\mathrm{S}\mathrm{T}}+{E}_{\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{p}}}\right)\times {{\Delta}}_{36,\mathrm{s}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}}

…”

Section: Methodsmentioning

confidence: 99%

“…Overall, the mean tropospheric Δ 36 value is determined by three factors (Yeung et al., 2016, 2021): The rate of isotopic reordering of O 2 molecules associated with O 3 photochemistry. The temperature and pressure at which the isotopic reordering occurs. The flux of stratospheric oxygen, which carries a distinct Δ 36 signature, into the troposphere. …”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%