Stable isotope ratios from foraminfera in Kara Sea sediments
Ostracods secrete their valve calcite within a few hours or days, therefore, its isotopic composition records ambient environmental conditions of only a short time span. Hydrographic changes between the calcification of individuals lead to a corresponding range (max.-min.) in the isotope values when...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.754600 2023-05-15T16:59:51+02:00 Stable isotope ratios from foraminfera in Kara Sea sediments Simstich, Johannes Stanovoy, Vladimir V Bauch, Dorothea Erlenkeuser, Helmut Spielhagen, Robert F LATITUDE: 74.657600 * LONGITUDE: 81.141100 * DATE/TIME START: 2000-09-07T06:22:00 * DATE/TIME END: 2000-09-07T06:22:00 2010-12-01 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.754600 https://doi.org/10.1594/PANGAEA.754600 en eng PANGAEA Ivanova, Elena V (2006): The Global Thermohaline Paleocirculation. Scientific World, Moscow (original Russian version); Springer Science+Business Media B.V., 2009 (English translation), 320 pp, https://doi.org/10.1007/978-90-481-2415-2 https://doi.pangaea.de/10.1594/PANGAEA.754600 https://doi.org/10.1594/PANGAEA.754600 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Simstich, Johannes; Stanovoy, Vladimir V; Bauch, Dorothea; Erlenkeuser, Helmut; Spielhagen, Robert F (2004): Holocene variability of bottom water hydrography on the Kara Sea shelf (Siberia) depicted in multiple single-valve analyses of stable isotopes in ostracods. Marine Geology, 206(1-4), 147-164, https://doi.org/10.1016/j.margeo.2004.01.008 Akademik Boris Petrov BP00 BP00-07/05 GC Gravity corer Kara Sea Siberian River Run-Off SIRRO Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.754600 https://doi.org/10.1016/j.margeo.2004.01.008 https://doi.org/10.1007/978-90-481-2415-2 2023-01-20T07:31:59Z Ostracods secrete their valve calcite within a few hours or days, therefore, its isotopic composition records ambient environmental conditions of only a short time span. Hydrographic changes between the calcification of individuals lead to a corresponding range (max.-min.) in the isotope values when measuring several (>=5) single valves from a specific sediment sample. Analyses of living (stained) ostracods from the Kara Sea sediment surface revealed high ranges of >2per mil of d18O and d13C at low absolute levels (d18O: <3per mil, d13C: <-3per mil) near the river estuaries of Ob and Yenisei and low ranges of not, vert, similar1per mil at higher absolute levels (d18O: 2-5.4per mil, d13C: -3 per mil to -1.5per mil) on the shelf and in submarine paleo-river channels. Comparison with a hydrographic data base and isotope measurements of bottom water samples shows that the average and the span of the ostracod-based isotope ranges closely mirror the long-term means and variabilities (standard deviation) of bottom water temperature and salinity. The bottom hydrography in the southern part of the Kara Sea shows strong response to the river discharge and its extreme seasonal and interannual variability. Less variable hydrographic conditions are indicative for deeper shelf areas to the north, but also for areas near the river estuaries along submarine paleo-river channels, which act as corridors for southward flowing cold and saline bottom water. Isotope analyses on up to five single ostracod valves per sample in the lower section (8-7 cal. ka BP) of a sediment core north of Yenisei estuary revealed d18O and d13C values which on average are lower by 0.6 per mil in both, d18O and d13C, than in the upper core section (<5 cal. ka BP). The isotope shifts illustrate the decreasing influence of isotopically light river water at the bottom as a result of the southward retreat of the Yenisei river mouth from the coring site due to global sea level rise. However, the ranges (max.-min.) in the single-valve d18O and ... Dataset Kara Sea PANGAEA - Data Publisher for Earth & Environmental Science Kara Sea Yenisei River ENVELOPE(84.738,84.738,69.718,69.718) ENVELOPE(81.141100,81.141100,74.657600,74.657600) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Akademik Boris Petrov BP00 BP00-07/05 GC Gravity corer Kara Sea Siberian River Run-Off SIRRO |
spellingShingle |
Akademik Boris Petrov BP00 BP00-07/05 GC Gravity corer Kara Sea Siberian River Run-Off SIRRO Simstich, Johannes Stanovoy, Vladimir V Bauch, Dorothea Erlenkeuser, Helmut Spielhagen, Robert F Stable isotope ratios from foraminfera in Kara Sea sediments |
topic_facet |
Akademik Boris Petrov BP00 BP00-07/05 GC Gravity corer Kara Sea Siberian River Run-Off SIRRO |
description |
Ostracods secrete their valve calcite within a few hours or days, therefore, its isotopic composition records ambient environmental conditions of only a short time span. Hydrographic changes between the calcification of individuals lead to a corresponding range (max.-min.) in the isotope values when measuring several (>=5) single valves from a specific sediment sample. Analyses of living (stained) ostracods from the Kara Sea sediment surface revealed high ranges of >2per mil of d18O and d13C at low absolute levels (d18O: <3per mil, d13C: <-3per mil) near the river estuaries of Ob and Yenisei and low ranges of not, vert, similar1per mil at higher absolute levels (d18O: 2-5.4per mil, d13C: -3 per mil to -1.5per mil) on the shelf and in submarine paleo-river channels. Comparison with a hydrographic data base and isotope measurements of bottom water samples shows that the average and the span of the ostracod-based isotope ranges closely mirror the long-term means and variabilities (standard deviation) of bottom water temperature and salinity. The bottom hydrography in the southern part of the Kara Sea shows strong response to the river discharge and its extreme seasonal and interannual variability. Less variable hydrographic conditions are indicative for deeper shelf areas to the north, but also for areas near the river estuaries along submarine paleo-river channels, which act as corridors for southward flowing cold and saline bottom water. Isotope analyses on up to five single ostracod valves per sample in the lower section (8-7 cal. ka BP) of a sediment core north of Yenisei estuary revealed d18O and d13C values which on average are lower by 0.6 per mil in both, d18O and d13C, than in the upper core section (<5 cal. ka BP). The isotope shifts illustrate the decreasing influence of isotopically light river water at the bottom as a result of the southward retreat of the Yenisei river mouth from the coring site due to global sea level rise. However, the ranges (max.-min.) in the single-valve d18O and ... |
format |
Dataset |
author |
Simstich, Johannes Stanovoy, Vladimir V Bauch, Dorothea Erlenkeuser, Helmut Spielhagen, Robert F |
author_facet |
Simstich, Johannes Stanovoy, Vladimir V Bauch, Dorothea Erlenkeuser, Helmut Spielhagen, Robert F |
author_sort |
Simstich, Johannes |
title |
Stable isotope ratios from foraminfera in Kara Sea sediments |
title_short |
Stable isotope ratios from foraminfera in Kara Sea sediments |
title_full |
Stable isotope ratios from foraminfera in Kara Sea sediments |
title_fullStr |
Stable isotope ratios from foraminfera in Kara Sea sediments |
title_full_unstemmed |
Stable isotope ratios from foraminfera in Kara Sea sediments |
title_sort |
stable isotope ratios from foraminfera in kara sea sediments |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.754600 https://doi.org/10.1594/PANGAEA.754600 |
op_coverage |
LATITUDE: 74.657600 * LONGITUDE: 81.141100 * DATE/TIME START: 2000-09-07T06:22:00 * DATE/TIME END: 2000-09-07T06:22:00 |
long_lat |
ENVELOPE(84.738,84.738,69.718,69.718) ENVELOPE(81.141100,81.141100,74.657600,74.657600) |
geographic |
Kara Sea Yenisei River |
geographic_facet |
Kara Sea Yenisei River |
genre |
Kara Sea |
genre_facet |
Kara Sea |
op_source |
Supplement to: Simstich, Johannes; Stanovoy, Vladimir V; Bauch, Dorothea; Erlenkeuser, Helmut; Spielhagen, Robert F (2004): Holocene variability of bottom water hydrography on the Kara Sea shelf (Siberia) depicted in multiple single-valve analyses of stable isotopes in ostracods. Marine Geology, 206(1-4), 147-164, https://doi.org/10.1016/j.margeo.2004.01.008 |
op_relation |
Ivanova, Elena V (2006): The Global Thermohaline Paleocirculation. Scientific World, Moscow (original Russian version); Springer Science+Business Media B.V., 2009 (English translation), 320 pp, https://doi.org/10.1007/978-90-481-2415-2 https://doi.pangaea.de/10.1594/PANGAEA.754600 https://doi.org/10.1594/PANGAEA.754600 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.754600 https://doi.org/10.1016/j.margeo.2004.01.008 https://doi.org/10.1007/978-90-481-2415-2 |
_version_ |
1766052344100814848 |