Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France).
International audience The northern Aquitaine Basin (southwest France) is a large multi-layer aquifer system that contains groundwater with strong residence time variability ranging from years to tens of thousands years. This system was studied using a multi-parameter approach involving isotopic tra...
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ftbrgm:oai:HAL:hal-01759639v1 2024-05-19T07:47:14+00:00 Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). Saltel, Marc Rebeix, Romain Thomas, Bertrand Franceschi, Michel Lavielle, Bernard Bertran, Pascal Bureau de Recherches Géologiques et Minières (BRGM) Chimie Nucléaire Analytique et Bio-environnementale (CNAB) Université Sciences et Technologies - Bordeaux 1 (UB)-Centre National de la Recherche Scientifique (CNRS) Environnement, Géo-ingénierie et Développement (EGID) Chamonix, France 2018-06-23 https://brgm.hal.science/hal-01759639 en eng HAL CCSD hal-01759639 https://brgm.hal.science/hal-01759639 5th European Conference on Permafrost, Book of Abstract 5th European Conference on Permafrost (EUCOP 2018) https://brgm.hal.science/hal-01759639 5th European Conference on Permafrost (EUCOP 2018), Jun 2018, Chamonix, France https://eucop2018.sciencesconf.org/ Late Pleistocene climate Paleohydrology Noble Gas Groundwater age Stable isotopes Groundwater recharge southwest France [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.IE]Environmental Sciences/Environmental Engineering [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/conferenceObject Conference papers 2018 ftbrgm 2024-05-02T00:17:41Z International audience The northern Aquitaine Basin (southwest France) is a large multi-layer aquifer system that contains groundwater with strong residence time variability ranging from years to tens of thousands years. This system was studied using a multi-parameter approach involving isotopic tracers (14C, 18O, 2H) to determine the groundwater residence time and to document climate fluctuations, while dissolved noble gases were used to estimate mean annual temperatures at the water table (NGRT, Noble Gas Recharge Temperature). Near-surface ground temperature reconstruction from 40 ka cal BP to the present was made using data collected from 5 aquifers. The coldest temperatures are recorded during late Marine Isotopic Stage (MIS) 3 and MIS 2, i.e. between 36 and 18 ka cal BP. The mean NGRT for the period 25-18 ka cal BP is estimated at 5.9 ± 0.9°C, and a strong increase towards modern values (11 to 13°C) is observed after 15 ka cal BP. The temperature drop between the Holocene and the Last Glacial ranges from 5 to 7°C, in agreement with previous NGRT studies in Europe. Since mean near-surface ground temperatures during the glacial were well above 0°C, long-term presence of permafrost in northern Aquitaine is unlikely. Conference Object permafrost BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
institution |
Open Polar |
collection |
BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
Late Pleistocene climate Paleohydrology Noble Gas Groundwater age Stable isotopes Groundwater recharge southwest France [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.IE]Environmental Sciences/Environmental Engineering [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Late Pleistocene climate Paleohydrology Noble Gas Groundwater age Stable isotopes Groundwater recharge southwest France [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.IE]Environmental Sciences/Environmental Engineering [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Saltel, Marc Rebeix, Romain Thomas, Bertrand Franceschi, Michel Lavielle, Bernard Bertran, Pascal Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). |
topic_facet |
Late Pleistocene climate Paleohydrology Noble Gas Groundwater age Stable isotopes Groundwater recharge southwest France [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.IE]Environmental Sciences/Environmental Engineering [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The northern Aquitaine Basin (southwest France) is a large multi-layer aquifer system that contains groundwater with strong residence time variability ranging from years to tens of thousands years. This system was studied using a multi-parameter approach involving isotopic tracers (14C, 18O, 2H) to determine the groundwater residence time and to document climate fluctuations, while dissolved noble gases were used to estimate mean annual temperatures at the water table (NGRT, Noble Gas Recharge Temperature). Near-surface ground temperature reconstruction from 40 ka cal BP to the present was made using data collected from 5 aquifers. The coldest temperatures are recorded during late Marine Isotopic Stage (MIS) 3 and MIS 2, i.e. between 36 and 18 ka cal BP. The mean NGRT for the period 25-18 ka cal BP is estimated at 5.9 ± 0.9°C, and a strong increase towards modern values (11 to 13°C) is observed after 15 ka cal BP. The temperature drop between the Holocene and the Last Glacial ranges from 5 to 7°C, in agreement with previous NGRT studies in Europe. Since mean near-surface ground temperatures during the glacial were well above 0°C, long-term presence of permafrost in northern Aquitaine is unlikely. |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) Chimie Nucléaire Analytique et Bio-environnementale (CNAB) Université Sciences et Technologies - Bordeaux 1 (UB)-Centre National de la Recherche Scientifique (CNRS) Environnement, Géo-ingénierie et Développement (EGID) |
format |
Conference Object |
author |
Saltel, Marc Rebeix, Romain Thomas, Bertrand Franceschi, Michel Lavielle, Bernard Bertran, Pascal |
author_facet |
Saltel, Marc Rebeix, Romain Thomas, Bertrand Franceschi, Michel Lavielle, Bernard Bertran, Pascal |
author_sort |
Saltel, Marc |
title |
Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). |
title_short |
Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). |
title_full |
Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). |
title_fullStr |
Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). |
title_full_unstemmed |
Paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern Aquitaine basin, France). |
title_sort |
paleoclimate variations and impact on groundwater recharge in multi-layer aquifer systems using a multi-tracer approach (northern aquitaine basin, france). |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://brgm.hal.science/hal-01759639 |
op_coverage |
Chamonix, France |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
5th European Conference on Permafrost, Book of Abstract 5th European Conference on Permafrost (EUCOP 2018) https://brgm.hal.science/hal-01759639 5th European Conference on Permafrost (EUCOP 2018), Jun 2018, Chamonix, France https://eucop2018.sciencesconf.org/ |
op_relation |
hal-01759639 https://brgm.hal.science/hal-01759639 |
_version_ |
1799487557126324224 |