Publication Abstracts

Baublitz et al. 2023

Baublitz, C.B., A.M. Fiore, S.M. Ludwig, J.M. Nicely, G.M. Wolfe, L.T. Murray, R. Commane, M.J. Prather, D.C. Anderson, G. Correa, B.N. Duncan, M. Follette-Cook, D.M. Westervelt, I. Bourgeois, W.H. Brune, T.P. Bui, J.P. DiGangi, G.S. Diskin, S.R. Hall, K. McKain, D.O. Miller, J. Peischl, A.B. Thames, C.R. Thompson, K. Ullmann, and S.C. Wofsy, 2023: An observation-based, reduced-form model for oxidation in the remote marine troposphere. Proc. Natl. Acad. Sci., 120, no. 34, e2209735120, doi:10.1073/pnas.2209735120.

The hydroxyl radical (OH) fuels atmospheric chemical cycling as the main sink for methane and a driver of the formation and loss of many air pollutants, but direct OH observations are sparse. We develop and evaluate an observation-based proxy for short-term, spatial variations in OH (ProxyOH) in the remote marine troposphere using comprehensive measurements from the NASA Atmospheric Tomography (ATom) airborne campaign. ProxyOH is a reduced form of the OH steady-state equation representing the dominant OH production and loss pathways in the remote marine troposphere, according to box model simulations of OH constrained with ATom observations. ProxyOH comprises only eight variables that are generally observed by routine ground- or satellite-based instruments. ProxyOH scales linearly with in situ [OH] spatial variations along the ATom flight tracks (median r2 = 0.90, interquartile range = 0.80 to 0.94 across 2-km altitude by 20° latitudinal regions). We deconstruct spatial variations in ProxyOH as a first-order approximation of the sensitivity of OH variations to individual terms. Two terms modulate within-region ProxyOH variations — water vapor (H2O) and, to a lesser extent, nitric oxide (NO). This implies that a limited set of observations could offer an avenue for observation-based mapping of OH spatial variations over much of the remote marine troposphere. Both H2O and NO are expected to change with climate, while NO also varies strongly with human activities. We also illustrate the utility of ProxyOH as a process-based approach for evaluating intermodel differences in remote marine tropospheric OH.

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BibTeX Citation

@article{ba02800e,
  author={Baublitz, C. B. and Fiore, A. M. and Ludwig, S. M. and Nicely, J. M. and Wolfe, G. M. and Murray, L. T. and Commane, R. and Prather, M. J. and Anderson, D. C. and Correa, G. and Duncan, B. N. and Follette-Cook, M. and Westervelt, D. M. and Bourgeois, I. and Brune, W. H. and Bui, T. P. and DiGangi, J. P. and Diskin, G. S. and Hall, S. R. and McKain, K. and Miller, D. O. and Peischl, J. and Thames, A. B. and Thompson, C. R. and Ullmann, K. and Wofsy, S. C.},
  title={An observation-based, reduced-form model for oxidation in the remote marine troposphere},
  year={2023},
  journal={Proceedings of the National Academy of Sciences},
  volume={120},
  number={34},
  pages={e2209735120},
  publisher={Proceedings of the National Academy of Sciences},
  doi={10.1073/pnas.2209735120},
}

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RIS Citation

TY  - JOUR
ID  - ba02800e
AU  - Baublitz, C. B.
AU  - Fiore, A. M.
AU  - Ludwig, S. M.
AU  - Nicely, J. M.
AU  - Wolfe, G. M.
AU  - Murray, L. T.
AU  - Commane, R.
AU  - Prather, M. J.
AU  - Anderson, D. C.
AU  - Correa, G.
AU  - Duncan, B. N.
AU  - Follette-Cook, M.
AU  - Westervelt, D. M.
AU  - Bourgeois, I.
AU  - Brune, W. H.
AU  - Bui, T. P.
AU  - DiGangi, J. P.
AU  - Diskin, G. S.
AU  - Hall, S. R.
AU  - McKain, K.
AU  - Miller, D. O.
AU  - Peischl, J.
AU  - Thames, A. B.
AU  - Thompson, C. R.
AU  - Ullmann, K.
AU  - Wofsy, S. C.
PY  - 2023
TI  - An observation-based, reduced-form model for oxidation in the remote marine troposphere
JA  - Proc. Natl. Acad. Sci.
JO  - Proceedings of the National Academy of Sciences
VL  - 120
IS  - 34
SP  - e2209735120
DO  - 10.1073/pnas.2209735120
PB  - Proceedings of the National Academy of Sciences
ER  -

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