Airborne observations constrain heterogeneous nitrogen and halogen chemistry on tropospheric and stratospheric biomass burning aerosol

Heterogeneous chemical cycles of pyrogenic nitrogen and halides influence tropospheric ozone and affect the stratosphere during extreme Pyrocumulonimbus (PyroCB) events. We report field-derived N2O5 uptake coefficients, gamma(N2O5), and ClNO2 yields, phi(ClNO2), from two aircraft campaigns observing fresh smoke in the lower and mid troposphere and processed/aged smoke in the upper troposphere and lower stratosphere (UTLS). Derived phi(ClNO2) varied across the full 0-1 range but was typically <0.5 and smallest in a PyroCB (<0.05). Derived gamma(N2O5) was low in agricultural smoke (0.2-3.6 x 10(-3)), extremely low in mid-tropospheric wildfire smoke (0.1 x 10(-3)), but larger in PyroCB processed smoke (0.7-5.0 x 10(-3)). Aged biomass burning aerosol in the UTLS had a higher gamma(N2O5) of 17 x 10(-3) that increased with sulfate and liquid water, but that was 1-2 orders of magnitude lower than values for aqueous sulfuric aerosol used in stratospheric models.

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Author Decker, Z. C. J.
Novak, G. A.
Aikin, K.
Veres, Patrick
Neuman, J. A.
Bourgeois, I.
Bui, T. P.
Campuzano-Jost, P.
Coggon, M. M.
Day, D. A.
DiGangi, J. P.
Diskin, G. S.
Dollner, M.
Franchin, Alessandro
Fredrickson, C. D.
Froyd, K. D.
Gkatzelis, G. I.
Guo, H.
Hall, S. R.
Halliday, H.
Hayden, K.
Holmes, C. D.
Jimenez, J. L.
Kupc, A.
Lindaas, J.
Middlebrook, A. M.
Moore, R. H.
Nault, B. A.
Nowak, J. B.
Pagonis, D.
Palm, B. B.
Peischl, J.
Piel, F. M.
Rickly, P. S.
Robinson, M. A.
Rollins, A. W.
Ryerson, T. B.
Schill, G. P.
Sekimoto, K.
Thompson, C. R.
Thornhill, K. L.
Thornton, J. A.
Ullmann, Kirk
Warneke, C.
Washenfelder, R. A.
Weinzierl, B.
Wiggins, E. B.
Williamson, C. J.
Winstead, E. L.
Wisthaler, A.
Womack, C. C.
Brown, S. S.
Publisher UCAR/NCAR - Library
Publication Date 2024-02-28T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2025-07-10T20:04:00.439732
Metadata Record Identifier edu.ucar.opensky::articles:26982
Metadata Language eng; USA
Suggested Citation Decker, Z. C. J., Novak, G. A., Aikin, K., Veres, Patrick, Neuman, J. A., Bourgeois, I., Bui, T. P., Campuzano-Jost, P., Coggon, M. M., Day, D. A., DiGangi, J. P., Diskin, G. S., Dollner, M., Franchin, Alessandro, Fredrickson, C. D., Froyd, K. D., Gkatzelis, G. I., Guo, H., Hall, S. R., Halliday, H., Hayden, K., Holmes, C. D., Jimenez, J. L., Kupc, A., Lindaas, J., Middlebrook, A. M., Moore, R. H., Nault, B. A., Nowak, J. B., Pagonis, D., Palm, B. B., Peischl, J., Piel, F. M., Rickly, P. S., Robinson, M. A., Rollins, A. W., Ryerson, T. B., Schill, G. P., Sekimoto, K., Thompson, C. R., Thornhill, K. L., Thornton, J. A., Ullmann, Kirk, Warneke, C., Washenfelder, R. A., Weinzierl, B., Wiggins, E. B., Williamson, C. J., Winstead, E. L., Wisthaler, A., Womack, C. C., Brown, S. S.. (2024). Airborne observations constrain heterogeneous nitrogen and halogen chemistry on tropospheric and stratospheric biomass burning aerosol. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7pc36hg. Accessed 20 August 2025.

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