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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 1
Hydrol. Earth Syst. Sci., 20, 299–328, 2016
https://doi.org/10.5194/hess-20-299-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 20, 299–328, 2016
https://doi.org/10.5194/hess-20-299-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 19 Jan 2016

Research article | 19 Jan 2016

Aggregation in environmental systems – Part 2: Catchment mean transit times and young water fractions under hydrologic nonstationarity

J. W. Kirchner
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AR: Author's response | RR: Referee report | ED: Editor decision
ED: Reconsider after major revisions (05 Sep 2015) by Thom Bogaard
AR by James Kirchner on behalf of the Authors (26 Oct 2015)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (27 Oct 2015) by Thom Bogaard
RR by Anonymous Referee #1 (20 Nov 2015)
ED: Publish as is (04 Dec 2015) by Thom Bogaard
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Short summary
Here I show that seasonal tracer cycles yield strongly biased estimates of mean transit times in nonstationary catchments (and, by implication, in real-world catchments). However, they can be used to reliably estimate the fraction of "young" water in streamflow, meaning water that fell as precipitation less than roughly 2–3 months ago. This young water fraction varies systematically between high and low flows and may help in characterizing controls on stream chemistry.
Here I show that seasonal tracer cycles yield strongly biased estimates of mean transit times in...
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