Nitrogen loss rates in streams: Scale-dependence and up-scaling methodology
2004 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 31, no 13, L13501- p.Article in journal (Refereed) Published
We show that the large spatial aggregation of model parameters in common catchment scale nitrogen budget modeling leads to artifacts that may, for instance, be a factor in explaining reported decreases of calibrated instream nitrogen loss rates, lambda(s)(*), with increasing stream size. In general, the common assumption of a single representative solute travel time for an entire stream reach may lead to considerable underestimation of the actual underlying local biogeochemical loss rate lambda(s) by lambda(s)(*), which increases with actual lambda(s) value and/ or increasing mean solute travel time and travel time variability in the stream. We propose an up-scaling methodology to overcome such model artifacts, in form of closed-form expressions of catchment-scale, in-stream nitrogen delivery factors for diffuse and point sources, as functions of local-scale nitrogen loss rates, lambda(s).
Place, publisher, year, edition, pages
2004. Vol. 31, no 13, L13501- p.
sorptive solute, mass arrival, transport, eutrophication, groundwater, watersheds, catchments, retention, marine
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-5539DOI: 10.1029/2004GL019996ISI: 000222654100003ScopusID: 2-s2.0-4544280420OAI: oai:DiVA.org:kth-5539DiVA: diva2:9938
QC 201009072006-04-052006-04-052011-09-26Bibliographically approved