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\begin{document}

\title{Technical Note: Revisiting the Procedure for Quantification of the Young
Water Fraction Based on Seasonal Tracer Cycles}



\author[1]{Tam Van Nguyen}%
\author[2]{Rohini Kumar}%
\author[1]{Ingo Heidbuchel}%
\author[3]{Arianna Borriero}%
\author[4]{Jan Fleckenstein}%
\affil[1]{Helmholtz Centre for Environmental Research}%
\affil[2]{UFZ-Helmholtz Centre for Environmental Research}%
\affil[3]{Helmholtz Centre for Environmental Researchvironmental Research}%
\affil[4]{Helmholtz Center for Environmental Research - UFZ}%


\vspace{-1em}



  
  \date{May 20, 2024}


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\begin{abstract}
AUTHORS' NOTE:

The paper was reviewed by three reviewers in WRR and did not pass the
review. There are some technical issues with our methodology. We advise
the readers to consult the authors before using any results from this
work. We are sorry for this inconvenience. For readers who interested in
the reviewers' comments, please contact me .

\par\null

Abstract:

The transit time (TT) of streamflow encapsulates information about how
catchments store and release water and solutes of different ages. The
young water fraction (Fyw), the fraction of streamflow that is younger
than a certain age (normally 2--3 months), has been increasingly used as
an alternative metric to the commonly used mean TT (mTT). In the
commonly used (`traditional') procedure presented by Kirchner (2016),
the age threshold (\selectlanguage{greek}τ\selectlanguage{english}yw) of Fyw separating young from old water is not
pre-defined and differs from catchment to catchment depending on the
shape of the (gamma) transit time distribution. However, it can be
argued that it is important to use the same pre-defined \selectlanguage{greek}τ\selectlanguage{english}yw for
inter-catchment comparison of Fyw. In this study, we propose an
alternative (`proposed') procedure for the estimation of Fyw with any
pre-defined \selectlanguage{greek}τ\selectlanguage{english}yw. This allows us to also compare the effects of data
sampling frequencies on the results of Fyw estimation using the same
\selectlanguage{greek}τ\selectlanguage{english}yw. We applied the traditional and proposed procedures using daily
oxygen isotope (\selectlanguage{greek}δ\selectlanguage{english}18O) data in the Alp and Erlenbach catchments,
Switzerland. We found that our proposed and the traditional procedure
can give very different Fyw values. With the proposed procedure, the
estimated Fyw significantly increases when the sampling frequency
changes from sub-monthly to monthly time steps. Overall, our study
highlights the importance of the selection of \selectlanguage{greek}τ\selectlanguage{english}yw and the sampling
frequency in Fyw estimation, which should be given more attention.%
\end{abstract}%



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\textbf{Hosted file}

\verb`966796_0_art_file_11114938_rwnkqd.docx`  available at \url{https://authorea.com/users/420245/articles/651944-technical-note-revisiting-the-procedure-for-quantification-of-the-young-water-fraction-based-on-seasonal-tracer-cycles}

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