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Global tropospheric hydroxyl distribution, budget and reactivity

Open access
Lelieveld, Jos, Gromov, Sergey, Pozzer, Andrea, Taraborrelli, Domenico·2016·Atmospheric Chemistry and Physics

Published version of a preprint

Abstract

Abstract. The self-cleaning or oxidation capacity of the atmosphere is principally controlled by hydroxyl (OH) radicals in the troposphere. Hydroxyl has primary (P) and secondary (S) sources, the former mainly through the photodissociation of ozone, the latter through OH recycling in radical reaction chains. We used the recent Mainz Organics Mechanism (MOM) to advance volatile organic carbon (VOC) chemistry in the general circulation model EMAC (ECHAM/MESSy Atmospheric Chemistry) and show that S is larger than previously assumed. By including emissions of a large number of primary VOC, and accounting for their complete breakdown and intermediate products, MOM is mass-conserving and calculates substantially higher OH reactivity from VOC oxidation compared to predecessor models. Whereas previously P and S were found to be of similar magnitude, the present work indicates that S may be twice as large, mostly due to OH recycling in the free troposphere. Further, we find that nighttime OH formation may be significant in the polluted subtropical boundary layer in summer. With a mean OH recycling probability of about 67 %, global OH is buffered and not sensitive to perturbations by natural or anthropogenic emission changes. Complementary primary and secondary OH formation mechanisms in pristine and polluted environments in the continental and marine troposphere, connected through long-range transport of O3, can maintain stable global OH levels.

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Show all 72 references

Research works printed but not linked: 5

  1. Ehhalt, D. H., Dorn, H.-P., and Poppe, D.: The chemistry of the hydroxyl radical in the troposphere, Proc. R. Soc. Edinb. B., 97, 17–34, 1991. · doi:10.1017/s0269727000005273
  2. Fuchs, H., Acir, I.-H., Bohn, B., Brauers, T., Dorn, H.-P., Häseler, R., Hofzumahaus, A., Holland, F., Kaminski, M., Li, X., Lu, K., Lutz, A., Nehr, S., Rohrer, F., Tillmann, R., Wegener, R., and Wahner, A.: OH regeneration from methacrolein oxidation investigated in the atmosphere simulation chamber SAPHIR, Atmos. Chem. Phys., 14, 7895–7908, https://doi.org/10.5194/acp-14-7895-2014, 2014. · doi:10.5194/acp-14-7895-2014
  3. Groß, C. B. M., Dillon, T. J., and Crowley, J. N.: Pressure dependent OH yields in the reactions of CH3CO and HOCH2CO with O2, Phys. Chem. Chem. Phys., 16, 10990–10998, 2014b. · doi:10.1039/c4cp01108b
  4. Nölscher, A. C., Butler, T., Auld, J., Veres, P., Muñoz, A., Taraborrelli, D., Vereecken, L., Lelieveld, J., and Williams, J.: Using total OH reactivity to assess isoprene photooxidation via measurement and model, Atmos. Environ., 89, 453–463, 2014. · doi:10.1016/j.atmosenv.2014.02.024
  5. Stockwell, W. R., Lawson, C. V., Saunders, E., and Goliff, W. S.: A review of tropospheric atmospheric chemistry and gas-phase chemical mechanisms for air quality modeling, Atmosphere, 3, 1–32, 2012. · doi:10.3390/atmos3010001

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Metadata

Authors
Lelieveld, J., Gromov, S., Pozzer, A., & Taraborrelli, D.
Venue
Atmospheric Chemistry and Physics
Published
2016-10-05
Volume
16
Issue
19
Pages
12477-12493
ISSN
  • 1680-7316 (ISSN-L)
  • 1680-7324
OpenAlex
W2293435465
Cited by
508
References
72
FWCI
17.11
Type
journal article
Language
en
Open access
gold

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Lelieveld, J., Gromov, S., Pozzer, A., & Taraborrelli, D. (2016). Global tropospheric hydroxyl distribution, budget and reactivity. Atmospheric Chemistry and Physics. https://doi.org/10.5194/acp-16-12477-2016

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