TY - JOUR
T1 - 36Cl in modern groundwater dated by a multi-tracer approach (3H/3He, SF6, CFC-12 and 85Kr)
T2 - A case study in quaternary sand aquifers in the Odense Pilot River Basin, Denmark
AU - Corcho Alvarado, J.A.
AU - Purtschert, R.
AU - Hinsby, K.
AU - Troldborg, L.
AU - Hofer, M.
AU - Kipfer, R.
AU - Aeschbach-Hertig, W.
AU - Arno-Synal, H.
N1 - Funding Information:
This study was supported by the EU project BASELINE “Natural Baseline Quality of European Groundwaters: A Basis for Aquifer Management” and the IAEA co-ordinated research program “Isotope response to the dynamic changes in groundwater systems due to long-term exploitation”. The Odense Water Company is acknowledged for access to wells and their water sample archive.
PY - 2005/3
Y1 - 2005/3
N2 - 36Cl produced by
thermonuclear bomb testing has been proposed as an additional tool to
date or at least to identify recent groundwater components. In order to
investigate the behaviour of 36Cl in shallow groundwater a multi-tracer approach (3H/3He, SF6, CFC-12 and 85Kr)
was used to characterise and date the groundwater of a quaternary sands
aquifer which is located on the Island of Funen near the city of
Odense, Denmark. Recharge to the semi-confined shallow aquifer occurs
through permeable sand windows and fractured tills at the surface.
Locally, however, mixing with older pre-bomb water from the underlying
limestone aquifer may occur. The integrated analyses of the available
tracer data allowed a well constrained age structure determination of
the investigated water system.The 36Cl/Cl ratios measured in groundwater were used to reconstruct the fallout rates for radioactive 36Cl
at Odense. The calculated fallout values exceeded the fallout estimated
based on data from the Dye-3 ice core in Greenland. Recycling of the
bomb peak fallout seems to be the most probable reason of the high
values measured. The local extent of this process is difficult to
quantify, which impedes the use of 36Cl for dating.
AB - 36Cl produced by
thermonuclear bomb testing has been proposed as an additional tool to
date or at least to identify recent groundwater components. In order to
investigate the behaviour of 36Cl in shallow groundwater a multi-tracer approach (3H/3He, SF6, CFC-12 and 85Kr)
was used to characterise and date the groundwater of a quaternary sands
aquifer which is located on the Island of Funen near the city of
Odense, Denmark. Recharge to the semi-confined shallow aquifer occurs
through permeable sand windows and fractured tills at the surface.
Locally, however, mixing with older pre-bomb water from the underlying
limestone aquifer may occur. The integrated analyses of the available
tracer data allowed a well constrained age structure determination of
the investigated water system.The 36Cl/Cl ratios measured in groundwater were used to reconstruct the fallout rates for radioactive 36Cl
at Odense. The calculated fallout values exceeded the fallout estimated
based on data from the Dye-3 ice core in Greenland. Recycling of the
bomb peak fallout seems to be the most probable reason of the high
values measured. The local extent of this process is difficult to
quantify, which impedes the use of 36Cl for dating.
UR - http://www.scopus.com/inward/record.url?scp=13244284971&partnerID=8YFLogxK
U2 - 10.1016/j.apgeochem.2004.09.018
DO - 10.1016/j.apgeochem.2004.09.018
M3 - Article
SN - 0883-2927
VL - 20
SP - 599
EP - 609
JO - Applied Geochemistry
JF - Applied Geochemistry
IS - 3
ER -
