edu.ucar.opensky::articles:24926 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T22:55:23.140107 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7wh2ths https://doi.org/10.3334/ORNLDAAC/1581 https Related Dataset #1 ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols Large contribution of biomass burning emissions to ozone throughout the global remote troposphere 2021-12-28T00:00:00Z publication https://n2t.org/ark:/85065/d7wh2ths https://doi.org/10.1073/pnas.2109628118 Bourgeois, I. author Peischl, J. author Neuman, J. A. author Brown, S. S. author Thompson, C. R. author Aikin, K. C. author Allen, H. M. author Angot, H. author Apel, Eric C. author Baublitz, C. B. author Brewer, J. F. author Campuzano-Jost, P. author Commane, R. author Crounse, J. D. author Daube, B. C. author DiGangi, J. P. author Diskin, G. S. author Emmons, Louisa K. author Fiore, A. M. author Gkatzelis, G. I. author Hills, Alan J. author Hornbrook, Rebecca author Huey, L. G. author Jimenez, J. L. author Kim, M. author Lacey, Forrest author McKain, K. author Murray, L. T. author Nault, B. A. author Parrish, D. D. author Ray, E. author Sweeney, C. author Tanner, D. author Wofsy, S. C. author Ryerson, T. B. author UCAR/NCAR - Library publisher Ozone is the third most important anthropogenic greenhouse gas after carbon dioxide and methane but has a larger uncertainty in its radiative forcing, in part because of uncertainty in the source characteristics of ozone precursors, nitrogen oxides, and volatile organic carbon that directly affect ozone formation chemistry. Tropospheric ozone also negatively affects human and ecosystem health. Biomass burning (BB) and urban emissions are significant but uncertain sources of ozone precursors. Here, we report globalscale, in situ airborne measurements of ozone and precursor source tracers from the NASA Atmospheric Tomography mission. Measurements from the remote troposphere showed that tropospheric ozone is regularly enhanced above background in polluted air masses in all regions of the globe. Ozone enhancements in air with high BB and urban emission tracers (2.1 to 23.8 ppbv [parts per billion by volume]) were generally similar to those in BB-influenced air (2.2 to 21.0 ppbv) but larger than those in urbaninfluenced air (27.7 to 6.9 ppbv). Ozone attributed to BB was 2 to 10 times higher than that from urban sources in the Southern Hemisphere and the tropical Atlantic and roughly equal to that from urban sources in the Northern Hemisphere and the tropical Pacific. Three independent global chemical transport models systematically underpredict the observed influence of BB on tropospheric ozone. Potential reasons include uncertainties in modeled BB injection heights and emission inventories, export efficiency of BB emissions to the free troposphere, and chemical mechanisms of ozone production in smoke. Accurately accounting for intermittent but large and widespread BB emissions is required to understand the global tropospheric ozone burden. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation