Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach
A stable isotope study of 67 kettle lakes and ponds situated on an esker aquifer (90 km2) in northern Finland was carried out to determine the role and extent of groundwater inflow in groundwater-dependent lakes. Distinct seasonal fluctuations in the δ18O and δ2H values of lakes are the result of se...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:bd186563dfa94603aa64648f359fef9d 2023-05-15T17:42:39+02:00 Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach E. Isokangas K. Rozanski P. M. Rossi A.-K. Ronkanen B. Kløve 2015-03-01 https://doi.org/10.5194/hess-19-1247-2015 http://www.hydrol-earth-syst-sci.net/19/1247/2015/hess-19-1247-2015.pdf https://doaj.org/article/bd186563dfa94603aa64648f359fef9d en eng Copernicus Publications 1027-5606 1607-7938 doi:10.5194/hess-19-1247-2015 http://www.hydrol-earth-syst-sci.net/19/1247/2015/hess-19-1247-2015.pdf https://doaj.org/article/bd186563dfa94603aa64648f359fef9d undefined Hydrology and Earth System Sciences, Vol 19, Iss 3, Pp 1247-1262 (2015) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/hess-19-1247-2015 2023-01-22T19:25:32Z A stable isotope study of 67 kettle lakes and ponds situated on an esker aquifer (90 km2) in northern Finland was carried out to determine the role and extent of groundwater inflow in groundwater-dependent lakes. Distinct seasonal fluctuations in the δ18O and δ2H values of lakes are the result of seasonal ice cover prohibiting evaporation during the winter. An iterative isotope mass balance approach was used to calculate the inflow-to-evaporation ratios (ITOT/E) of all 67 lakes during the summer of 2013 when the isotopic compositions of the lakes were approaching a steady-state. The balance calculations were carried out independently for 2H and 18O data. Since evaporation rates were derived independently of any mass balance considerations, it was possible to determine the total inflow (ITOT) and mean turnover time (MTT) of the lakes. Furthermore, the groundwater seepage rates to all studied lakes were calculated. A quantitative measure was introduced for the dependence of a lake on groundwater (G index) that is defined as the percentage contribution of groundwater inflow to the total inflow of water to the given lake. The G index values of the lakes studied ranged from ca. 39 to 98%, revealing generally large groundwater dependency among the studied lakes. This study shows the effectiveness of applying an isotope mass balance approach to quantify the groundwater reliance of lakes situated in a relatively small area with similar climatic conditions. Article in Journal/Newspaper Northern Finland Unknown Hydrology and Earth System Sciences 19 3 1247 1262 |
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geo envir E. Isokangas K. Rozanski P. M. Rossi A.-K. Ronkanen B. Kløve Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach |
topic_facet |
geo envir |
description |
A stable isotope study of 67 kettle lakes and ponds situated on an esker aquifer (90 km2) in northern Finland was carried out to determine the role and extent of groundwater inflow in groundwater-dependent lakes. Distinct seasonal fluctuations in the δ18O and δ2H values of lakes are the result of seasonal ice cover prohibiting evaporation during the winter. An iterative isotope mass balance approach was used to calculate the inflow-to-evaporation ratios (ITOT/E) of all 67 lakes during the summer of 2013 when the isotopic compositions of the lakes were approaching a steady-state. The balance calculations were carried out independently for 2H and 18O data. Since evaporation rates were derived independently of any mass balance considerations, it was possible to determine the total inflow (ITOT) and mean turnover time (MTT) of the lakes. Furthermore, the groundwater seepage rates to all studied lakes were calculated. A quantitative measure was introduced for the dependence of a lake on groundwater (G index) that is defined as the percentage contribution of groundwater inflow to the total inflow of water to the given lake. The G index values of the lakes studied ranged from ca. 39 to 98%, revealing generally large groundwater dependency among the studied lakes. This study shows the effectiveness of applying an isotope mass balance approach to quantify the groundwater reliance of lakes situated in a relatively small area with similar climatic conditions. |
format |
Article in Journal/Newspaper |
author |
E. Isokangas K. Rozanski P. M. Rossi A.-K. Ronkanen B. Kløve |
author_facet |
E. Isokangas K. Rozanski P. M. Rossi A.-K. Ronkanen B. Kløve |
author_sort |
E. Isokangas |
title |
Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach |
title_short |
Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach |
title_full |
Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach |
title_fullStr |
Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach |
title_full_unstemmed |
Quantifying groundwater dependence of a sub-polar lake cluster in Finland using an isotope mass balance approach |
title_sort |
quantifying groundwater dependence of a sub-polar lake cluster in finland using an isotope mass balance approach |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/hess-19-1247-2015 http://www.hydrol-earth-syst-sci.net/19/1247/2015/hess-19-1247-2015.pdf https://doaj.org/article/bd186563dfa94603aa64648f359fef9d |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Hydrology and Earth System Sciences, Vol 19, Iss 3, Pp 1247-1262 (2015) |
op_relation |
1027-5606 1607-7938 doi:10.5194/hess-19-1247-2015 http://www.hydrol-earth-syst-sci.net/19/1247/2015/hess-19-1247-2015.pdf https://doaj.org/article/bd186563dfa94603aa64648f359fef9d |
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undefined |
op_doi |
https://doi.org/10.5194/hess-19-1247-2015 |
container_title |
Hydrology and Earth System Sciences |
container_volume |
19 |
container_issue |
3 |
container_start_page |
1247 |
op_container_end_page |
1262 |
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