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Regime shift in groundwater temperature triggered by the Arctic Oscillation.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2011
Author Figura Simon, Livingstone David M., Hoehn Eduard, Kipfer Rolf,
Project Response of Swiss groundwaters to climatic forcing and climate change: analysis of the historical instrumental record
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Original article (peer-reviewed)

Journal Geophysical Research Letters
Volume (Issue) 38(23)
Page(s) 1 - 5
Title of proceedings Geophysical Research Letters
DOI 10.1029/2011GL049749

Open Access

URL http://onlinelibrary.wiley.com/doi/10.1029/2011GL049749/epdf
Type of Open Access Publisher (Gold Open Access)

Abstract

Groundwater is the world’s most important source of raw drinking water. However, the potential impact of climate change on this vital resource is unclear because of a lack of relevant long-term data. Here we statistically analyze over 20 years of groundwater temperature data from five Swiss aquifers fed predominantly by river-bank infiltration. The results reveal an abrupt increase in annual mean groundwater temperature centered on 1987–1988 that can also be observed in air and river temperatures. We associate this temperature increase with the Northern Hemisphere late 1980s climate regime shift (CRS), which itself is related to an abrupt change in the behavior of the Arctic Oscillation. Because temperature affects redox conditions in groundwater, groundwater biogeochemistry in aquifers fed by river-bank infiltration is likely to depend on large-scale climatic forcing and will be affected by climate change.
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