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| Titel |
Measurement of NOx fluxes from a tall tower in Beijing |
| VerfasserIn |
Freya Squires, Rachel Dunmore, Alastair Lewis, Adam Vaughan, Neil Mullinger, Eiko Nemitz, Oliver Wild, Qiang Zhang, Jacqueline Hamilton, James Lee, Pingqing Fu |
| 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 |
250141485
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| Publikation (Nr.) |
 EGU/EGU2017-5003.pdf |
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| Zusammenfassung |
| Nitrogen Oxides (NOx, the sum of nitrogen monoxide (NO) and nitrogen dioxide (NO2)) are
significant anthropogenic pollutants emitted from most combustion processes. NOx is a
precursor species to the formation of O3 and secondary aerosols and, in high concentrations,
NO2 can have adverse effects on human health through action as a respiratory irritant. For
these reasons, there has been increased focus on improving NOx emissions inventories,
typically developed using ‘bottom-up’ estimates of emissions from their sources, which
are used to predict current and future air quality and to guide abatement strategy.
Recent studies have shown a discrepancy between NOx inventories and measured
NOx emissions for UK cities, highlighting the limitations of bottom-up emissions
inventories and the importance of accurate measurement data to improve the estimates.
Similarly, inventories in China are associated with large uncertainties and are rapidly
changing with time in response to economic development and new environmental
regulation.
Here, we present data collected as part of the Air Pollutants in Beijing (AIRPOLL-Beijing)
campaign from an urban site located at the Institute of Atmospheric Physics, Chinese
Academy of Sciences (IAP, CAS) (39˚ 58’28”N, 116˚ 22’16”E) in central Beijing.
NOx concentrations were measured using a state-of-the-art chemiluminescence instrument,
sampling from an inlet at 100 metres on a meteorological tower. Measurements at 5 Hz
coupled with wind vector data measured by a sonic anemometer located at the same height as
the inlet allowed NOx emission fluxes to be calculated using the eddy covariance method.
Measurements were made during the period 11/11/2016 – 10/12/2016 and compared
to existing emission estimates from The Multi-resolution Emission Inventory for
China (MEIC) inventory. It is anticipated that this work will be used to evaluate
the accuracy of emissions inventories for Beijing, to develop improved emissions
estimates and thus provide greater information about the sources of NOx in the city. |
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