A three-dimensional-model inversion of methyl chloroform to constrain the atmospheric oxidative capacity

Naus, Stijn; Montzka, Stephen A.; Patra, Prabir K.; Krol, Maarten C.

doi:https://doi.org/10.5194/acp-21-4809-2021

Articles | Volume 21, issue 6

https://doi.org/10.5194/acp-21-4809-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-21-4809-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 6

Research article

|

29 Mar 2021

Research article |

| 29 Mar 2021

A three-dimensional-model inversion of methyl chloroform to constrain the atmospheric oxidative capacity

Stijn Naus, Stephen A. Montzka, Prabir K. Patra, and Maarten C. Krol

Supplement

https://doi.org/10.5194/acp-21-4809-2021-supplement

Data sets

Atmospheric hydroxyl distribution from EMAC/MOM model v1 S. Gromov, D. Taraborrelli, A. Pozzer, and J. Lelieveld https://doi.org/10.5281/zenodo.4044501

NCAR/MOPITT Reanalysis B. Gaubert and H. Worden https://doi.org/10.5065/D6SB44GZ

The model data outputs from the Atmospheric Chemistry \& Climate Model Intercomparison Project (ACCMIP) D. Shindell, J. Lamarque, W. Collins, V. Eyring, T. Nagashima, V. Naik, S. Szopa, and G. Zeng http://catalogue.ceda.ac.uk/uuid/ded523bf23d59910e5d73f1703a2d540

ATom: Aircraft Flight Track and Navigational Data S. C. Wofsy and ATom Science Team https://doi.org/10.3334/ORNLDAAC/1613

Flask data of methyl chloroform from the NOAA surface network S. A. Montzka and J. W. Elkins ftp://ftp.cmdl.noaa.gov/hats/solvents/CH3CCl3/flasks

Flask observations of various hydrofluorocarbons from the NOAA surface network S. A. Montzka and J. W. Elkins ftp://ftp.cmdl.noaa.gov/hats/hfcs/

SF6 flask data from the NOAA surface network J. W. Elkins, B. D. Hall, D. J. Mondeel, and J. D. Nance ftp://ftp.cmdl.noaa.gov/hats/sf6/flasks/Otto/pairs/

HIAPER Pole-to-Pole Observations (HIPPO) of methyl chloroform S. A. Montzka and HIPPO science team ftp://ftp.cmdl.noaa.gov/hats/solvents/CH3CCl3/HIPPO_data_Naus_etal_2020/

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Short summary

Following up on previous box model studies, we employ a 3D transport model to estimate variations in the hydroxyl radical (OH) from observations of methyl chloroform (MCF). We derive small interannual OH variations that are consistent with variations in the El Niño–Southern Oscillation. We also find evidence for the release of MCF from oceans in atmospheric gradients of MCF. Both findings highlight the added value of a 3D transport model since box model studies did not identify these effects.