| Records |
| Author |
Jin, Z.; Külls, C. |
Title  |
FDM based OA-ICOS for high accuracy 13C quantification in gaseous CO2 |
Type |
Journal Article |
| Year |
2020 |
Publication |
Earth and Environmental Science |
Abbreviated Journal |
EES |
| Volume |
446 |
Issue |
3 |
Pages |
032061 |
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no |
| Call Number |
THL @ christoph.kuells @ Jin2020fdm |
Serial |
16 |
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| Author |
Gil-Márquez, J.M.; Sültenfuß, J.; Andreo, B.; Mudarra, M. |
| Title |
Groundwater dating tools (3H, 3He, 4He, CFC-12, SF6) coupled with hydrochemistry to evaluate the hydrogeological functioning of complex evaporite-karst settings |
Type |
Journal Article |
| Year |
2020 |
Publication |
Journal of Hydrology |
Abbreviated Journal |
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| Volume |
580 |
Issue |
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Pages |
124263 |
| Keywords |
Groundwater dating, Evaporite karst, Brine spring, Free-shape models |
| Abstract |
The hydrogeological functioning of four different areas in a complex evaporite-karst unit of predominantly aquitard behavior in S Spain was investigated. Environmental dating tracers (3H, 3He, 4He, CFC-12, SF6) and hydrochemical data were determined from spring samples to identify and characterize groundwater flow components of different residence times in the media. Results show a general geochemical evolution pattern, from higher (recharge areas) to lower positions (discharge areas), in which mineralization rises as well as the value of the rCl−/SO42−, evidencing longer water-rock interaction. Ne values show degassing of most of the samples, favored by the high salinity of groundwater and the development of karstification so that the concentration of all the considered gases were corrected according to the difference between the theoretical and the measured Ne. The presence of modern groundwater in every sample was proved by the detection of 3H and CFC-12. At the opposite, the higher amount of radiogenic 4He in most samples also indicates that they have an old component. The 3H/3He dating method does not give reliable ages as a consequence of degassing and the large uncertainty of the 3He/4He ratios of the sources for the radiogenic Helium. The large SF6 concentrations suggest terrigenic production related to halite and dolomite. Binary Mixing and Free Shape Models were created based on 3H and CFC-12 data to interpret the age distribution of the samples. Two parameters (GA50 and >70%) were proposed as an indicator of that distribution, as they provide further information than the mean age. Particularly, GA50 is derived from the median groundwater age and is presented as a new way of interpreting mixed groundwater age data. A greater fraction of old groundwater (3H and CFC-12 free) was identified in discharge areas, while the proportion and estimated infiltration date of the younger fractions in recharge areas were higher and more recent, respectively. The application of different approaches has been useful to corroborate previous theoretical conceptual model proposed for the study area and to test the applicability of the used environmental tracer in dating brine groundwater and karst springs. |
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0022-1694 |
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no |
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THL @ christoph.kuells @ Gilmarquez2020124263 |
Serial |
213 |
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| Author |
Krüger, N.; Külls, C.; Bruggeman, A.; Eliades, M.; Christophi, C.; Rigas, M.; Eracleous, T. |
| Title |
Groundwater recharge estimates with soil isotope profiles-is there a bias on coarse-grained hillslopes? |
Type |
Conference Article |
| Year |
2020 |
Publication |
EGU General Assembly Conference Abstracts |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
9840 |
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THL @ christoph.kuells @ Krueger2020groundwater |
Serial |
42 |
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Christofi, C.; Bruggeman, A.; Külls, C.; Constantinou, C. |
| Title |
Hydrochemical evolution of groundwater in gabbro of the Troodos Fractured Aquifer. A comprehensive approach |
Type |
Journal Article |
| Year |
2020 |
Publication |
Applied Geochemistry |
Abbreviated Journal |
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| Volume |
114 |
Issue |
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Pages |
104524 |
| Keywords |
geochemistry |
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| Publisher |
Pergamon |
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English |
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no |
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THL @ christoph.kuells @ Christofi2020hydrochemical |
Serial |
13 |
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| Author |
Mahindawansha, A.; Külls, C.; Kraft, P.; Breuer, L. |
| Title |
Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water |
Type |
Journal Article |
| Year |
2020 |
Publication |
Hydrology and Earth System Sciences |
Abbreviated Journal |
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| Volume |
24 |
Issue |
7 |
Pages |
3627-3642 |
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Copernicus GmbH |
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yes |
| Call Number |
THL @ christoph.kuells @ Mahindawansha2020investigating |
Serial |
14 |
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