Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan)
We report delta O-18 and delta C-13 values of 21 fossil shells from the aquatic gastropod Radix from a sediment core taken in the eastern basin of Lake Karakul, Tajikistan (38.86-39.16A degrees N, 73.26-73.56A degrees E, 3,928 m above sea level) and covering the last 4,200 cal yr BP. The lake is sur...
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2014
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Online Access: | https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37691 https://doi.org/10.1007/s10933-014-9776-4 |
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:37691 2023-05-15T17:36:46+02:00 Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) Taft, Linda Mischke, Steffen Wiechert, Uwe Leipe, Christian Rajabov, Ilhomjon Riedel, Frank 2014 https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37691 https://doi.org/10.1007/s10933-014-9776-4 eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37691 https://doi.org/10.1007/s10933-014-9776-4 info:eu-repo/semantics/closedAccess Institut für Geowissenschaften article doc-type:article 2014 ftubpotsdam https://doi.org/10.1007/s10933-014-9776-4 2022-07-28T20:46:29Z We report delta O-18 and delta C-13 values of 21 fossil shells from the aquatic gastropod Radix from a sediment core taken in the eastern basin of Lake Karakul, Tajikistan (38.86-39.16A degrees N, 73.26-73.56A degrees E, 3,928 m above sea level) and covering the last 4,200 cal yr BP. The lake is surrounded by many palaeoshorelines evidencing former lake-level changes, most likely triggered by changes in meltwater flux. This hypothesis was tested by interpreting the isotope ratios of Radix shells together with delta O-18 values of Ostracoda and of authigenic aragonite. The mean delta O-18 values of Radix and Ostracoda fall along the same long-term trend indicating a change in the isotopic composition of precipitation, which contributed to the glaciers in the catchment as snow and finally as melt water to the lake. The sclerochronological delta O-18 and delta C-13 patterns in Radix shells provide seasonal weather information, which is discussed in context with previously proposed climatic changes during the last 4,200 cal yr BP. The period between similar to 4,200 and 3,000 cal yr BP was characterized by stepwise glacier advance in the catchment most likely due to a precipitation surplus. Subsequently the climate remained relatively cold but the lake level fluctuated, as indicated by ostracod shell isotope data. From similar to 1,800 cal yr BP the sclerochronological patterns provide evidence for increasing melt water flux and transport of allochthonous carbon into the lake, most likely due to an accelerated glacier retreat. The period around 1,500 cal yr BP was characterized by strong warming, increasing meltwater flux, glacier retreat and an increasing lake level. Warm conditions continued until similar to 500 cal yr I'P probably representing the end of the Medieval Warm Period. A short relatively cold (dry?) period and a lower lake level are assumed for similar to 350 cal yr BP, possibly an analogue to the Maunder Minimum cooling in the North Atlantic region. Our results show that the lake system is complex, ... Article in Journal/Newspaper North Atlantic University of Potsdam: publish.UP Lower Lake ENVELOPE(-129.290,-129.290,53.428,53.428) Journal of Paleolimnology 52 1-2 27 41 |
institution |
Open Polar |
collection |
University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
Institut für Geowissenschaften |
spellingShingle |
Institut für Geowissenschaften Taft, Linda Mischke, Steffen Wiechert, Uwe Leipe, Christian Rajabov, Ilhomjon Riedel, Frank Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) |
topic_facet |
Institut für Geowissenschaften |
description |
We report delta O-18 and delta C-13 values of 21 fossil shells from the aquatic gastropod Radix from a sediment core taken in the eastern basin of Lake Karakul, Tajikistan (38.86-39.16A degrees N, 73.26-73.56A degrees E, 3,928 m above sea level) and covering the last 4,200 cal yr BP. The lake is surrounded by many palaeoshorelines evidencing former lake-level changes, most likely triggered by changes in meltwater flux. This hypothesis was tested by interpreting the isotope ratios of Radix shells together with delta O-18 values of Ostracoda and of authigenic aragonite. The mean delta O-18 values of Radix and Ostracoda fall along the same long-term trend indicating a change in the isotopic composition of precipitation, which contributed to the glaciers in the catchment as snow and finally as melt water to the lake. The sclerochronological delta O-18 and delta C-13 patterns in Radix shells provide seasonal weather information, which is discussed in context with previously proposed climatic changes during the last 4,200 cal yr BP. The period between similar to 4,200 and 3,000 cal yr BP was characterized by stepwise glacier advance in the catchment most likely due to a precipitation surplus. Subsequently the climate remained relatively cold but the lake level fluctuated, as indicated by ostracod shell isotope data. From similar to 1,800 cal yr BP the sclerochronological patterns provide evidence for increasing melt water flux and transport of allochthonous carbon into the lake, most likely due to an accelerated glacier retreat. The period around 1,500 cal yr BP was characterized by strong warming, increasing meltwater flux, glacier retreat and an increasing lake level. Warm conditions continued until similar to 500 cal yr I'P probably representing the end of the Medieval Warm Period. A short relatively cold (dry?) period and a lower lake level are assumed for similar to 350 cal yr BP, possibly an analogue to the Maunder Minimum cooling in the North Atlantic region. Our results show that the lake system is complex, ... |
format |
Article in Journal/Newspaper |
author |
Taft, Linda Mischke, Steffen Wiechert, Uwe Leipe, Christian Rajabov, Ilhomjon Riedel, Frank |
author_facet |
Taft, Linda Mischke, Steffen Wiechert, Uwe Leipe, Christian Rajabov, Ilhomjon Riedel, Frank |
author_sort |
Taft, Linda |
title |
Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) |
title_short |
Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) |
title_full |
Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) |
title_fullStr |
Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) |
title_full_unstemmed |
Sclerochronological oxygen and carbon isotope ratios in Radix (Gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr BP at Lake Karakul, eastern Pamirs (Tajikistan) |
title_sort |
sclerochronological oxygen and carbon isotope ratios in radix (gastropoda) shells indicate changes of glacial meltwater flux and temperature since 4,200 cal yr bp at lake karakul, eastern pamirs (tajikistan) |
publishDate |
2014 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37691 https://doi.org/10.1007/s10933-014-9776-4 |
long_lat |
ENVELOPE(-129.290,-129.290,53.428,53.428) |
geographic |
Lower Lake |
geographic_facet |
Lower Lake |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37691 https://doi.org/10.1007/s10933-014-9776-4 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1007/s10933-014-9776-4 |
container_title |
Journal of Paleolimnology |
container_volume |
52 |
container_issue |
1-2 |
container_start_page |
27 |
op_container_end_page |
41 |
_version_ |
1766136354303901696 |