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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 9 | Copyright
Clim. Past, 12, 1785-1804, 2016
https://doi.org/10.5194/cp-12-1785-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 06 Sep 2016

Research article | 06 Sep 2016

Streamflow variability over the 1881–2011 period in northern Québec: comparison of hydrological reconstructions based on tree rings and geopotential height field reanalysis

Pierre Brigode1,2,a, François Brissette1, Antoine Nicault3, Luc Perreault4, Anna Kuentz5,b, Thibault Mathevet5, and Joël Gailhard5 Pierre Brigode et al.
  • 1École de Technologie Supérieure, Université du Québec, Montréal, Canada
  • 2Ouranos Consortium, Montréal, Canada
  • 3ECCOREV, Aix-en-Provence, France
  • 4Institut de recherche d'Hydro-Québec (IREQ), Varennes, Canada
  • 5DTG, Electricité de France, Grenoble, France
  • anow at: Université Côte d'Azur, CNRS, OCA, IRD, Géoazur
  • bnow at: SMHI, Norrköping, Sweden

Abstract. Over the last decades, different methods have been used by hydrologists to extend observed hydro-climatic time series, based on other data sources, such as tree rings or sedimentological datasets. For example, tree ring multi-proxies have been studied for the Caniapiscau Reservoir in northern Québec (Canada), leading to the reconstruction of flow time series for the last 150 years. In this paper, we applied a new hydro-climatic reconstruction method on the Caniapiscau Reservoir and compare the obtained streamflow time series against time series derived from dendrohydrology by other authors on the same catchment and study the natural streamflow variability over the 1881–2011 period in that region. This new reconstruction is based not on natural proxies but on a historical reanalysis of global geopotential height fields, and aims firstly to produce daily climatic time series, which are then used as inputs to a rainfall–runoff model in order to obtain daily streamflow time series. The performances of the hydro-climatic reconstruction were quantified over the observed period, and showed good performances, in terms of both monthly regimes and interannual variability. The streamflow reconstructions were then compared to two different reconstructions performed on the same catchment by using tree ring data series, one being focused on mean annual flows and the other on spring floods. In terms of mean annual flows, the interannual variability in the reconstructed flows was similar (except for the 1930–1940 decade), with noteworthy changes seen in wetter and drier years. For spring floods, the reconstructed interannual variabilities were quite similar for the 1955–2011 period, but strongly different between 1880 and 1940. The results emphasize the need to apply different reconstruction methods on the same catchments. Indeed, comparisons such as those above highlight potential differences between available reconstructions and, finally, allow a retrospective analysis of the proposed reconstructions of past hydro-climatological variabilities.

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In this paper, we apply a new hydro-climatic reconstruction method on the Caniapiscau Reservoir (Canada), compare the obtained streamflow time series against time series derived from dendrohydrology by other authors on the same catchment, and study the natural streamflow variability over the 1881–2011 period. This new reconstruction is based on a historical reanalysis of global geopotential height fields and aims to produce daily streamflow time series (using a rainfall–runoff model).
In this paper, we apply a new hydro-climatic reconstruction method on the Caniapiscau Reservoir...
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