 |
| Titel |
Observed groundwater temperature response to recent climate change |
| VerfasserIn |
K. Menberg, P. Blum, B. L. Kurylyk, P. Bayer |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 11 ; Nr. 18, no. 11 (2014-11-06), S.4453-4466 |
| Datensatznummer |
250120522
|
| Publikation (Nr.) |
 copernicus.org/hess-18-4453-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Climate change is known to have a considerable influence on many components
of the hydrological cycle. Yet, the implications for groundwater
temperature, as an important driver for groundwater quality, thermal use and
storage, are not yet comprehensively understood. Furthermore, few studies
have examined the implications of climate-change-induced groundwater
temperature rise for groundwater-dependent ecosystems. Here, we examine the
coupling of atmospheric and groundwater warming by employing stochastic and
deterministic models. Firstly, several decades of temperature time series
are statistically analyzed with regard to climate regime shifts (CRSs) in the
long-term mean. The observed increases in shallow groundwater temperatures
can be associated with preceding positive shifts in regional surface air
temperatures, which are in turn linked to global air temperature changes.
The temperature data are also analyzed with an analytical solution to the
conduction–advection heat transfer equation to investigate how subsurface
heat transfer processes control the propagation of the surface temperature
signals into the subsurface. In three of the four monitoring wells, the
predicted groundwater temperature increases driven by the regime shifts at
the surface boundary condition generally concur with the observed
groundwater temperature trends. Due to complex interactions at the ground
surface and the heat capacity of the unsaturated zone, the thermal signals
from distinct changes in air temperature are damped and delayed in the
subsurface, causing a more gradual increase in groundwater temperatures.
These signals can have a significant impact on large-scale groundwater
temperatures in shallow and economically important aquifers. These findings
demonstrate that shallow groundwater temperatures have responded rapidly to
recent climate change and thus provide insight into the vulnerability of
aquifers and groundwater-dependent ecosystems to future climate change. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|