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| Titel |
Long term concentration gradient measurements of trace gases (ozone, nitrogen oxides and ammonia) for flux calculation; results and uncertainties |
| VerfasserIn |
Tamás Weidinger, László Horváth, Zita Takács, Attila Machon, Andrea Pogány, Árpád Mohácsi, Zoltán Bozóky, Zoltán Nagy, Krisztina Pintér, Zoltán Istenes |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053188
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| Zusammenfassung |
| Hourly O3-NO-NOx concentration profile measurements above a semiarid grassland
(Bugacpuszta, NitroEurope IP, Level3) were analysed on the basis of four year
measurements (2006–2010). Yearly, seasonal and mean daily variations of concentration
gradients and fluxes were investigated in the lower 4 m layer using measurements at 4
levels with 5 min time average. Surface layer turbulence parameters (momentum,
sensible and latent heat fluxes) were calculated from eddy covariance measurements.
The daily macro-circulation catalog of Péczely is used for macrosynoptic weather
types.
The limitations of gradient measurements (non- monotonic profiles, type of universal
functions, time shift of concentration measurements in different levels, areal and temporal
fluctuations of concentrations, advection, etc.) were also investigated. Negative ozone
gradients were detected many times above 1-3 m from surface in summer accompanied by
high radiation. Relatively high NOx and very low NO concentrations (in most cases
close to detection limit) were measured, therefore the NO flux calculation was
uncertain.
Results of ammonia concentration and flux measurements with a novel photoacoustic
instrument (WaSul-Flux – developed at the University of Szeged) are also summarized. These
results include long term concentration data obtained at Bugacpuszta together with a few
seasonal gradient data; as well as results of three measurement campaigns (Easter bush,
Scotland, Choryn, Poland and Bjerringbro, Denmark). Uncertainty and limitation of gradient
and flux calculation were also investigated |
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