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| Titel |
Seasonal Changes in diurnal in-Stream Nitrate Concentration Oscillations |
| VerfasserIn |
Simon Rusjan, Matjaž Mikoš  , Brilly Mitja, Andrej Vidmar |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033301
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| Zusammenfassung |
| A variability of seasonal changes in the diurnal in-stream NO3-N concentration oscillations
was studied through high-frequency measurements of the stream-water’s physical, chemical
parameters (in-stream NO3-N concentration, water temperature, dissolved oxygen,
pH) and hydrometeorological variables (stream discharge, solar radiation) under
hydrologically stable conditions. The study was carried out in 2006, within the 42 km2
forested Padež stream watershed in the southwestern part of Slovenia, which is
characterized by distinctive hydrogeological settings (flysch) and climate conditions
(transitional area between the Mediterranean and continental climate). Fine temporal
resolution of the data measured at 15 minute intervals enabled the identification of the
main driving factors responsible for the seasonal variability in the diurnal pattern
of the streamwater NO3-N concentrations vs. seasonal and diurnal behavior of
meteorological and other water chemistry constituents. Seasonal variability of the shifts in
daily maximum (up to 6 hours) and minimum NO3-N concentrations (between
1 and 3 hours) and changes in the amplitude of the daily NO3-N concentration
oscillations (in order of 0.1–0.3 mg/l-N) offer supplementary evidence of the in-stream
NO3-N processing by photoautotrophs. A wavelet analysis was further used to
acquire clear, de-noised NO3-N concentration signals on which models in the form of
Fourier series were build, reaching R2 values between 0.73 and 0.94. The models
can be used to simulate the in-stream NO3-N oscillating signal in order to obtain
more accurate assessment of the NO3-N exports from the forested watershed in
different seasonal settings, undisturbed by the changing hydrological conditions. |
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