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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
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 13 (2011)
Datensatznummer 250048132
 
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 (49.969˚  N, 8.148˚  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 (242 cm a.g.l.) were performed. The proximity to the densely populated Rhine-Main-Area (location of measurement site: 9.5 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 95 ppb, with corresponding daytime O3 levels sometimes as low as 2 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 5 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.