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Atmospheric Chemistry and Physics









Black carbon (BC) contributes to Arctic warming, yet sources of Arctic BC and their geographic contributions remain uncertain. We interpret a series of recent airborne (NETCARE 2015; PAMARCMiP 2009 and 2011 campaigns) and ground-based measurements (at Alert, Barrow and Ny-Ålesund) from multiple methods (thermal, laser incandescence and light absorption) with the GEOS-Chem global chemical transport model and its adjoint to attribute the sources of Arctic BC. This is the first comparison with a chemical transport model of refractory BC (rBC) measurements at Alert. The springtime airborne measurements performed by the NETCARE campaign in 2015 and the PAMARCMiP campaigns in 2009 and 2011 offer BC vertical profiles extending to above 6 km across the Arctic and include profiles above Arctic ground monitoring stations. Our simulations with the addition of seasonally varying domestic heating and of gas flaring emissions are consistent with ground-based measurements of BC concentrations at Alert and Barrow in winter and spring (rRMSE  < 13 %) and with airborne measurements of the BC vertical profile across the Arctic (rRMSE  = 17 %) except for an underestimation in the middle troposphere (500–700 hPa).


Jun-Wei Xu1, Randall V. Martin1,2, Andrew Morrow1, Sangeeta Sharma3, Lin Huang3, W. Richard Leaitch3, Julia Burkart4, Hannes Schulz5, Marco Zanatta5, Megan D. Willis4, Daven K. Henze6, Colin J. Lee1, Andreas B. Herber5, and Jonathan P. D. Abbatt4

1Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada
2Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
3Atmospheric Science and Technology Directorate/Science and Technology Branch, Environment and Climate Change Canada, Toronto, ON, Canada
4Department of Chemistry, University of Toronto, Toronto, ON, Canada
5Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
6Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA

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Creative Commons Attribution 3.0 License
This work is licensed under a Creative Commons Attribution 3.0 License.