Publications

Wilmouth, D. M., F. F. Østerstrøm, J. B. Smith, J. G. Anderson, and R. J. Salawitch, Impact of the Hunga Tonga volcanic eruption on stratospheric composition. PNAS (Proc. Natl. Acad. Sci. USA), 46, e2301994120, 2023, doi: 10.1073/pnas.2301994120.

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Østerstrøm, F. F., J. E. Klobas, R. P. Kennedy, A. Cadoux, and D. M. Wilmouth, Sensitivity of stratospheric ozone to the latitude, season, and halogen content of a contemporary explosive volcanic eruption. Nature Sci. Rep.13, 6457, 2023, doi: 10.1038/s41598-023-32574-9.

We present a systematic evaluation of the perturbation to the stratosphere from an explosive volcanic eruption injecting sulfur dioxide into the atmosphere, as a function of latitude, season, and injection gas halogen content in a chemistry-climate state representative of the present day (modeled as year 2025). Enhancements in aerosol surface area density and decreases in stratospheric ozone are...

Vijayakumar, S., and D. M. Wilmouth, Kinetics of the reactions of chlorinated Very Short-Lived Substances (VSLSs) with chlorine atoms. J. Phys. Chem. A127, 7284–7294, 2023, doi: 10.1021/acs.jpca.3c02200.

See abstract at https://doi.org/10.1021/acs.jpca.3c02200.

Homeyer, C. R., J. B. Smith, K. M. Bedka, K. P. Bowman, D. M. Wilmouth, R. Ueyama, J. M. Dean-Day, J. M. St. Clair, R. Hannun, J. Hare, A. Pandey, D. S. Sayres, T. F. Hanisco, A. E. Gordon, and E. N. Tinney, Extreme altitudes of stratospheric hydration by midlatitude convection observed during the DCOTSS field campaign. Geophys. Res. Lett.50, e2023GL104914, 2023, doi: 10.1029/2023GL104914.

Water vapor's contribution to Earth's radiative forcing is most sensitive to changes in its lower stratosphere concentration. One recognized pathway for rapid increases in stratospheric water vapor is tropopause-overshooting convection. Since this pathway has been rarely sampled, the NASA Dynamics and Chemistry of the Summer Stratosphere (DCOTSS) field project focused on obtaining in situ...

Cadoux A., Tegtmeier S., Aiuppa S., 2022, Natural Halogen Emissions to the Atmosphere: Sources, Flux and Environmental Impact. Elements Magazine Special Issue “Halogens: From Planetary Surfaces to Interiors”, DOI: 10.2138/gselements.18.1.27. In Press.

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Vijayakumar, S., Ranasinghe, D. S., and D. M. Wilmouth, Kinetics of the reactions of ozone with halogen atoms in the stratosphere. Atmosphere12, 1053, 2021, doi: 10.3390/atmos12081053.

See abstract at https://doi.org/10.3390/atmos12081053.

Vijayakumar, S., and D. M. Wilmouth, Atmospheric fate of formyl chloride and mechanisms of the gas-phase reactions with OH radicals and Cl atoms. Chem. Phys. Lett.777, 138709, 2021, doi: 10.1016/j.cplett.2021.138709.

See abstract at https://doi.org/10.1016/j.cplett.2021.138709.

Klobas, J. E., J. Hansen, D. K. Weisenstein, R. P. Kennedy, and D. M. Wilmouth, Sensitivity of iodine-mediated stratospheric ozone loss chemistry to future chemistry-climate scenarios. Front. Earth Sci.9, 617586, 2021, doi: 10.3389/feart.2021.617586.

As the chemical and physical state of the stratosphere evolves, so too will the rates of important ozone-destroying reactions. In this work, we evaluate the chemistry-climate sensitivity of reactions of stratospheric iodine, reporting the iodine alpha factor (the efficiency of ozone loss mediated by a single iodine atom relative to the ozone loss mediated by a single chlorine atom) and the iodine...

Louvel M., Cadoux A., Brooker R., Proux O. and Hazemann J.-L., 2020, New insights on Br speciation in volcanic glasses and structural controls on halogen degassing. American Mineralogist Special Collection “Halogens in Planetary Systems”, 105, 795 - 802.

The volcanic degassing of halogens, and especially of the heavier Br and I, received increased attention over the last 20 years due to their significant effect on atmospheric chemistry, notably the depletion of stratospheric ozone. While the effect of melt composition on halogen diffusion, solubility, or fluid-melt partitioning in crustal magma chambers has been thoroughly studied, structural...

Wilmouth, D. M., and D. S. Sayres, Determination of Rayleigh scattering cross sections and indices of refraction for Ar, CO2, SF6, and CH4 using BBCES in the ultraviolet. J. Quant. Spectrosc. Radiat. Transfer255, 107224, 2020, doi:10.1016/j.jqsrt.2020.107224.

Accurate Rayleigh scattering cross sections are important for understanding the propagation of electromagnetic radiation in planetary atmospheres and for calibrating mirror reflectivity in high finesse optical cavities. In this study, we used Broadband Cavity Enhanced Spectroscopy (BBCES) to measure Rayleigh scattering cross sections for argon, carbon dioxide, sulfur hexafluoride, and...

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