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| Titel |
Characterisation of Black Carbon (BC) mixing state and flux in Beijing using single particle measurements. |
| VerfasserIn |
Rutambhara Joshi, Dantong Liu, James Allan, Hugh Coe, Michael Flynn, Kurtis Broda, Jason Olfert, Martin Irwin, Yele Sun, Pingqing Fu, Junfeng Wang, Xinlei Ge, Ben Langford, Eiko Nemitz, Neil Mullinger |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143371
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| Publikation (Nr.) |
 EGU/EGU2017-7081.pdf |
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| Zusammenfassung |
| BC is generated by the incomplete combustion of carbonaceous fuels and it is an important
component of fine PM2.5. In the atmosphere BC particles have a complex structure and its
mixing state has crucial impact on optical properties. Quantifying the sources and
emissions of black carbon in urban environments is important and presently uncertain,
particularly in megacities undergoing rapid growth and change in emissions. During the
winter of 2016 (10th Nov-10th Dec) the BC was characterised as part of a large joint
UK-China field experiment in Beijing. This paper focuses on understanding the mixing
state of BC as well as identification and quantification of BC sources. We used a
combination of a Centrifugal Particle Mass Analyser (CPMA) and a Single Particle Soot
Photometer (SP2) to uniquely quantify the morphology independent mass of single
refractory BC particles and their coating content. The CPMA allows us to select
pre-charged aerosol particles according to their mass to charge ratio and the SP2 provides
information on the mass of refractory BC through a laser-induced incandescence method.
Furthermore, another SP2 was used to measure the BC flux at 100m height using the
Eddy Covariance method. We have successfully gathered 4 weeks of continuous
measurements which include several severe pollution events in Beijing. Here we present
preliminary results, characterising the distribution of coating mass on BC particles in
Beijing and linking this to the main sources of BC in the city. We will provide
initial estimates of the BC flux over a several kilometre footprint. Such analysis will
provide important information for the further investigation of source distribution,
emission, lifetime and optical properties of BC under complex environments in Beijing. |
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