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| Titel |
Propagation of soil moisture memory to streamflow and evapotranspiration in Europe |
| VerfasserIn |
R. Orth, S. I. Seneviratne |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 10 ; Nr. 17, no. 10 (2013-10-11), S.3895-3911 |
| Datensatznummer |
250085953
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| Publikation (Nr.) |
 copernicus.org/hess-17-3895-2013.pdf |
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| Zusammenfassung |
| As a key variable of the land-climate system soil moisture is a main driver
of streamflow and evapotranspiration under certain conditions. Soil moisture
furthermore exhibits outstanding memory (persistence) characteristics. Many
studies also report distinct low frequency variations for streamflow, which
are likely related to soil moisture memory. Using data from over 100
near-natural catchments located across Europe, we investigate in this study
the connection between soil moisture memory and the respective memory of
streamflow and evapotranspiration on different time scales. For this purpose
we use a simple water balance model in which dependencies of runoff
(normalised by precipitation) and evapotranspiration (normalised by
radiation) on soil moisture are fitted using streamflow observations. The
model therefore allows us to compute the memory characteristics of soil
moisture, streamflow and evapotranspiration on the catchment scale. We find
considerable memory in soil moisture and streamflow in many parts of the
continent, and evapotranspiration also displays some memory at monthly time
scale in some catchments. We show that the memory of streamflow and
evapotranspiration jointly depend on soil moisture memory and on the strength
of the coupling of streamflow and evapotranspiration to soil moisture.
Furthermore, we find that the coupling strengths of streamflow and
evapotranspiration to soil moisture depend on the shape of the fitted
dependencies and on the variance of the meteorological forcing. To better
interpret the magnitude of the respective memories across Europe, we finally
provide a new perspective on hydrological memory by relating it to the mean
duration required to recover from anomalies exceeding a certain threshold. |
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