Stable isotope ratios measured on carbonate tests from the Kara Sea

River discharge of Ob and Yenisei to the Kara Sea is highly variable on seasonal and interannual time scales. River water dominates the shallow bottom water near the river mouths, making it warmer and less saline but seasonally and interannually more changeable than bottom water on the deeper shelf. This hydrographic pattern shows up in measurements and modelling, and in stable isotope records (delta18O, delta13C) along the growth axis of bivalve shells and in multiple analyses of single benthic foraminiferal shells. Average isotope ratios increase, but sample-internal variability decreases with water depth and distance from river mouths. However, isotope records of bivalves and foraminifera of a sediment core from a former submarine channel of Yenisei River reveal a different pattern. The retreat of the river mouth from this site due to early Holocene sea level rise led to increasing average isotope values up core, but not to the expected decrease of the in-sample isotope variability. Southward advection of cold saline water along the palaeo-river channel probably obscured the hydrographic variability during the early Holocene. Later, when sediment filled the channel, the hydrographic variability at the core location remained low, because the shallowing proceeded synchronously with the retreat of the river mouth.

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Cite this as

Spielhagen, Robert F, Simstich, Johannes, Erlenkeuser, Helmut, Stanovoy, Vladimir V (2005). Dataset: Stable isotope ratios measured on carbonate tests from the Kara Sea. https://doi.org/10.1594/PANGAEA.708249

DOI retrieved: 2005

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.708249
Author Spielhagen, Robert F
Given Name Robert F
Family Name Spielhagen
More Authors
Simstich, Johannes
Erlenkeuser, Helmut
Stanovoy, Vladimir V
Source Creation 2005
Publication Year 2005
Resource Type application/zip - filename: simstich_2005
Subject Areas
Name: LandSurface

Name: Lithosphere

Related Identifiers
Title: Modern and Holocene hydrographic characteristics of the shallow Kara Sea shelf (Siberia) as reflected by stable isotopes of bivalves and benthic foraminifera
Identifier: https://doi.org/10.1111/j.1502-3885.2005.tb01099.x
Type: DOI
Relation: IsSupplementTo
Year: 2005
Source: Boreas
Authors: Simstich Johannes , Erlenkeuser Helmut , Spielhagen Robert F , Stanovoy Vladimir V .