Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves
Stable oxygen and carbon isotope profiles from modern bivalve shells were investigated in order to reconstruct short‐term hydrographical changes in the river‐shelf system of the Laptev Sea. Oxygen isotopic profiles obtained from the aragonitic species Astarte borealis exhibit amplitude cycles interp...
Published in: | Boreas |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2003
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1502-3885.2003.tb01084.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2003.tb01084.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2003.tb01084.x |
id |
crwiley:10.1111/j.1502-3885.2003.tb01084.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1502-3885.2003.tb01084.x 2024-06-02T08:10:02+00:00 Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves MUELLER‐LUPP, THOMAS ERLENKEUSER, HELMUT BAUCH, HENNING A. 2003 http://dx.doi.org/10.1111/j.1502-3885.2003.tb01084.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2003.tb01084.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2003.tb01084.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 32, issue 2, page 292-303 ISSN 0300-9483 1502-3885 journal-article 2003 crwiley https://doi.org/10.1111/j.1502-3885.2003.tb01084.x 2024-05-03T11:56:35Z Stable oxygen and carbon isotope profiles from modern bivalve shells were investigated in order to reconstruct short‐term hydrographical changes in the river‐shelf system of the Laptev Sea. Oxygen isotopic profiles obtained from the aragonitic species Astarte borealis exhibit amplitude cycles interpreted as annual hydrographical cycles. These records reflect the strong contrast between summer and winter bottom water conditions in the Laptev Sea. The seasonal variations in δ 18 O are mainly controlled by the riverine freshwater discharge during summer with 0.5‰ per salinity unit. Corrected for a defined species‐dependent fractionation offset of ‐0.37‰, time‐dependent salinity records were reconstructed from these δ 18 O profiles. They indicate a good correspondence to seasonal hydrographic changes and synoptical data. Persistent trends with shell growth towards more negative δ 13 C values are observed in all specimens and appear to be related to metabolic changes of the bivalves during ontogeny. In contrast, short‐term fluctuations are likely linked to seasonal variabilities of the river water outflow patterns and enhanced phytoplankton productivity during summer. This is corroborated by a clear watermass‐related distinction of the various δ 13 C records made on the basis of water depth and distance from the riverine source. Article in Journal/Newspaper laptev Laptev Sea Wiley Online Library Laptev Sea Boreas 32 2 292 303 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Stable oxygen and carbon isotope profiles from modern bivalve shells were investigated in order to reconstruct short‐term hydrographical changes in the river‐shelf system of the Laptev Sea. Oxygen isotopic profiles obtained from the aragonitic species Astarte borealis exhibit amplitude cycles interpreted as annual hydrographical cycles. These records reflect the strong contrast between summer and winter bottom water conditions in the Laptev Sea. The seasonal variations in δ 18 O are mainly controlled by the riverine freshwater discharge during summer with 0.5‰ per salinity unit. Corrected for a defined species‐dependent fractionation offset of ‐0.37‰, time‐dependent salinity records were reconstructed from these δ 18 O profiles. They indicate a good correspondence to seasonal hydrographic changes and synoptical data. Persistent trends with shell growth towards more negative δ 13 C values are observed in all specimens and appear to be related to metabolic changes of the bivalves during ontogeny. In contrast, short‐term fluctuations are likely linked to seasonal variabilities of the river water outflow patterns and enhanced phytoplankton productivity during summer. This is corroborated by a clear watermass‐related distinction of the various δ 13 C records made on the basis of water depth and distance from the riverine source. |
format |
Article in Journal/Newspaper |
author |
MUELLER‐LUPP, THOMAS ERLENKEUSER, HELMUT BAUCH, HENNING A. |
spellingShingle |
MUELLER‐LUPP, THOMAS ERLENKEUSER, HELMUT BAUCH, HENNING A. Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves |
author_facet |
MUELLER‐LUPP, THOMAS ERLENKEUSER, HELMUT BAUCH, HENNING A. |
author_sort |
MUELLER‐LUPP, THOMAS |
title |
Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves |
title_short |
Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves |
title_full |
Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves |
title_fullStr |
Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves |
title_full_unstemmed |
Seasonal and interannual variability of Siberian river discharge in the Laptev Sea inferred from stable isotopes in modern bivalves |
title_sort |
seasonal and interannual variability of siberian river discharge in the laptev sea inferred from stable isotopes in modern bivalves |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1111/j.1502-3885.2003.tb01084.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2003.tb01084.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2003.tb01084.x |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
laptev Laptev Sea |
genre_facet |
laptev Laptev Sea |
op_source |
Boreas volume 32, issue 2, page 292-303 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1502-3885.2003.tb01084.x |
container_title |
Boreas |
container_volume |
32 |
container_issue |
2 |
container_start_page |
292 |
op_container_end_page |
303 |
_version_ |
1800755844151771136 |