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| Titel |
Potential surface temperature and shallow groundwater temperature response to climate change: an example from a small forested catchment in east-central New Brunswick (Canada) |
| VerfasserIn |
B. L. Kurylyk, C. P.-A. Bourque, K. T. B. MacQuarrie |
| 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. 7 ; Nr. 17, no. 7 (2013-07-11), S.2701-2716 |
| Datensatznummer |
250018932
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| Publikation (Nr.) |
 copernicus.org/hess-17-2701-2013.pdf |
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| Zusammenfassung |
Global climate models project significant changes to air temperature and
precipitation regimes in many regions of the Northern Hemisphere. These
meteorological changes will have associated impacts to surface and
shallow subsurface thermal regimes, which are of interest to practitioners
and researchers in many disciplines of the natural sciences. For example,
groundwater temperature is critical for providing and sustaining suitable
thermal habitat for cold-water salmonids. To investigate the surface and
subsurface thermal effects of atmospheric climate change, seven downscaled
climate scenarios (2046–2065) for a small forested catchment in New
Brunswick, Canada were employed to drive the surface energy and moisture
flux model, ForHyM2. Results from these seven simulations indicate that
climate change-induced increases in air temperature and changes in snow
cover could increase summer surface temperatures (range −0.30 to
+3.49 °C, mean +1.49 °C), but decrease winter
surface temperatures (range −1.12 to +0.08 °C, mean
−0.53 °C) compared to the reference period simulation. Thus,
changes to the timing and duration of snow cover will likely decouple
changes in mean annual air temperature (mean +2.11 °C) and mean annual
ground surface temperature (mean +1.06 °C).
Projected surface temperature data were then used to drive an empirical
surface to groundwater temperature transfer function developed from measured
surface and groundwater temperature. Results from the empirical
transfer function suggest that changes in groundwater temperature will
exhibit seasonality at shallow depths (1.5 m), but be seasonally constant
and approximately equivalent to the change in the mean annual surface
temperature at deeper depths (8.75 m). The simulated increases in future
groundwater temperature suggest that the thermal sensitivity of
baseflow-dominated streams to decadal climate change may be greater than
previous studies have indicated. |
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