Articles | Volume 18, issue 16
Research article
18 Aug 2021
Research article |  | 18 Aug 2021

Diel patterns in stream nitrate concentration produced by in-stream processes

Jan Greiwe, Markus Weiler, and Jens Lange

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Cited articles

Aubert, A. H. and Breuer, L.: New Seasonal Shift in In-Stream Diurnal Nitrate Cycles Identified by Mining High-Frequency Data, PloS One, 11, e0153138,, 2016. 
Austin, B. J. and Strauss, E. A.: Nitrification and denitrification response to varying periods of desiccation and inundation in a western Kansas stream, Hydrobiologia, 658, 183–195,, 2011. 
Birgand, F., Skaggs, R. W., Chescheir, G. M., and Gilliam, J. W.: Nitrogen Removal in Streams of Agricultural Catchments – A Literature Review, Crit. Rev. Env. Sci. Tec., 37, 381–487,, 2007. 
Burns, D. A., Pellerin, B. A., Miller, M. P., Capel, P. D., Tesoriero, A. J., and Duncan, J. M.: Monitoring the riverine pulse: Applying high-frequency nitrate data to advance integrative understanding of biogeochemical and hydrological processes, WIREs Water, 140, e1348,, 2019. 
Christensen, P. B., Nielsen, L. P., Sørensen, J., and Revsbech, N. P.: Denitrification in nitrate-rich streams: Diurnal and seasonal variation related to benthic oxygen metabolism, Limnol. Oceanogr., 35, 640–651,, 1990. 
Short summary
We analyzed variability in diel nitrate patterns at three locations in a lowland stream. Comparison of time lags between monitoring sites with water travel time indicated that diel patterns were created by in-stream processes rather than transported downstream from an upstream point of origin. Most of the patterns (70 %) could be explained by assimilatory nitrate uptake. The remaining patterns suggest seasonally varying dominance and synchronicity of different biochemical processes.
Final-revised paper