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Exchange of reactive nitrogen compounds : concentrations and fluxes of total ammonium and total nitrate above a spruce canopy

Title data

Wolff, Veronika ; Trebs, Ivonne ; Foken, Thomas ; Meixner, Franz X.:
Exchange of reactive nitrogen compounds : concentrations and fluxes of total ammonium and total nitrate above a spruce canopy.
In: Biogeosciences. Vol. 7 (2010) Issue 5 . - pp. 1729-1744.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-7-1729-2010

Abstract in another language

Total ammonium (tot-NH₄+) and total nitrate (tot-NO₃−) provide chemically conservative quantities in the measurement of surface exchange of reactive nitrogen compounds ammonia (NH₃), particulate ammonium (NH₄+), nitric acid (HNO₃), and particulate nitrate (NO₃−), using the aerodynamic gradient method. Total fluxes were derived from concentration differences of total ammonium (NH₃ and NH₄+) and total nitrate (HNO₃ and NO₃−) measured at two levels. Gaseous species and related particulate compounds were measured selectively, simultaneously and continuously above a spruce forest canopy in south-eastern Germany in summer 2007. Measurements were performed using a wet-chemical two-point gradient instrument, the GRAEGOR. Median concentrations of NH₃, HNO₃, NH₄+, and NO₃− were 0.57, 0.12, 0.76, and 0.48 μg m⁻³, respectively. Total ammonium and total nitrate fluxes showed large variations depending on meteorological conditions, with concentrations close to zero under humid and cool conditions and higher concentrations under dry conditions. Mean fluxes of total ammonium and total nitrate in September 2007 were directed towards the forest canopy and were −65.77 ng m⁻² s⁻¹ and −41.02 ng m⁻² s⁻¹ (in terms of nitrogen), respectively. Their deposition was controlled by aerodynamic resistances only, with very little influence of surface resistances. Including measurements of wet deposition and findings of former studies on occult deposition (fog water interception) at the study site, the total N deposition in September 2007 was estimated to 5.86 kg ha⁻¹.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER84314
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Micrometeorology - Univ.-Prof. Dr. Thomas Foken
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 21 Aug 2015 06:49
Last Modified: 21 Aug 2015 06:49
URI: https://eref.uni-bayreuth.de/id/eprint/18426