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Titel |
Soil biogenic NO emissions from a rare, nutrient-poor grassland ecosystem in Central Europe |
VerfasserIn |
Daniel Plake, Alexander Moravek, Jens-C. Mayer, Michael Welling, Stefan Wolff, Ivonne Trebs |
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 |
250048132
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Zusammenfassung |
We continuously measured soil NO emission fluxes on the largest coherent nutrient poor
steppe-like grassland ecosystem complex in Rhine Hessen (region of Rhineland-Palatinate,
Germany) during an intensive observation period of 73 days (26 Sep to 1 Dec 2010). The
measurements were part of the Finthenberg experiment which was conducted on the estate of
the Mainz Finthen Airport (Mainz, Germany (49.969Ë Â N, 8.148Ë Â E)). The NO soil
emission fluxes as well as NO2 and O3 deposition fluxes were determined using the dynamic
chamber technique. Simultaneously, soil moisture, soil temperature and vertical profiles of
NO, NO2, O3, CO2, H2O (seven inlet heights: 4, 13, 22, 75, 97, 167, 350 cm above
ground level (a.g.l.)), vertical temperature and humidity profiles were measured. Additionally,
eddy covariance flux measurements of O3, CO2 and H2O (242Â cm a.g.l.) were
performed.
The proximity to the densely populated Rhine-Main-Area (location of measurement site:
9.5Â km south-west of the Mainz city centre) requires a very careful data analysis regarding
the particular wind directions. Two contrasting regimes were found. While freshly emitted
anthropogenic NO (maximal mixing ratios of 95Â ppb, with corresponding daytime
O3 levels sometimes as low as 2Â ppb) caused non-stationary conditions during
periods (hours to days) with north-eastern winds, situations with south-western
winds were influenced by rather rural air masses (NO mixing ratios from 0.4 to
5Â ppb).
We will present NO soil emission fluxes as well as NO2 and O3 deposition fluxes under
different conditions and compare these results with fluxes determined using the aerodynamic
gradient method. Required corrections for chemical reactions will be taken into account. |
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