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| Titel |
MetNH3: Metrology for ammonia in ambient air |
| VerfasserIn |
Christine Braban, Marsailidh Twigg, Sim Tang, Daiana Leuenberger, Valerio Ferracci, Nick Martin, Céline Pascale, Tuomas Hieta, Andrea Pogány, Stefan Persijn, Janneke van Wijk, Holger Gerwig, Klaus Wirtze, Carlo Tiebe, David Balslev-Harder, Bernhardt Niederhausen |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113856
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| Publikation (Nr.) |
 EGU/EGU2015-14091.pdf |
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| Zusammenfassung |
| Measuring ammonia in ambient air is a sensitive and priority issue due to its harmful effects
on human health and ecosystems. The European Directive 2001/81/EC on “National
Emission Ceilings for Certain Atmospheric Pollutants (NEC)” regulates ammonia emissions
in the member states. However, there is a lack of regulation to ensure reliable ammonia
measurements namely in applicable analytical technology, maximum allowed uncertainty,
quality assurance and quality control (QC/QA) procedures as well as in the infrastructure to
attain metrological traceability. Validated ammonia measurement data of high quality from
air monitoring networks are vitally important for identifying changes due to implementations
of environment policies, for understanding where the uncertainties in current emission
inventories are derived from and for providing independent verification of atmospheric model
predictions.
The new EURAMET project MetNH3 aims to develop improved reference gas mixtures
by static and dynamic gravimetric generation methods, develop and characterise laser based
optical spectrometric standards and establish the transfer from high-accuracy standards to
field applicable methods. MetNH3started in June 2014 and in this presentation the
first results from the metrological characterisation of a commercially available
cavity ring-down spectrometer (CRDS) will be discussed. Also first tests and results
from a new design, Controlled Atmosphere Test Facility (CATFAC), which is to be
characterised and used to validate the performance of diffusive samplers, denuders and
on-line instruments, will be reported. CAFTEC can be used to control test parameters
such as ammonia concentration, relative humidity and wind speed. Outline plans
for international laboratory and field intercomparisons in 2016 will be presented. |
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