scholarly journals The nutrient, salinity, and stable oxygen isotope composition of Bering and Chukchi Seas waters in and near the Bering Strait

1997 ◽  
Vol 102 (C6) ◽  
pp. 12563-12573 ◽  
Author(s):  
Lee W. Cooper ◽  
Terry E. Whitledge ◽  
Jacqueline M. Grebmeier ◽  
Tom Weingartner
Keyword(s):  
Oxygen Isotope ◽  
Isotope Composition ◽  
Oxygen Isotope Composition ◽  
Bering Strait ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen

Interannual trends in stable oxygen isotope composition in precipitation of China during 1979–2007: Spatial incoherence

2017 ◽  
Vol 454 ◽  
pp. 25-37 ◽  
Author(s):  
Sen Yang ◽  
Mingjun Zhang ◽  
Shengjie Wang ◽  
Yangmin Liu ◽  
Fang Qiang ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Composition ◽  
Oxygen Isotope Composition ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen

scholarly journals Stable oxygen isotope composition is biased by shell calcification intensity in planktonic Foraminifera

2020 ◽  
Author(s):  
Manuel F. G. Weinkauf ◽  
Jeroen Groeneveld ◽  
Joanna Waniek ◽  
Torsten Vennemann ◽  
Martini Rossana
Keyword(s):  
Oxygen Isotope ◽  
Isotope Composition ◽  
Planktonic Foraminifera ◽  
Oxygen Isotope Composition ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen

Stable oxygen isotope composition of plant tissue: a review

2007 ◽  
Vol 34 (2) ◽  
pp. 83 ◽  
Author(s):  
Margaret M. Barbour
Keyword(s):  
Oxygen Isotope ◽  
Plant Tissue ◽  
Organic Molecules ◽  
Isotope Composition ◽  
Measurement Techniques ◽  
Isotope Analysis ◽  
Theoretical Models ◽  
Oxygen Isotope Composition ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen

With the development of rapid measurement techniques, stable oxygen isotope analysis of plant tissue is poised to become an important tool in plant physiological, ecological, paleoclimatic and forensic studies. Recent advances in mechanistic understanding have led to the improvement of process-based models that accurately predict variability in the oxygen isotope composition of plant organic material (δ18Op). δ18Op has been shown to reflect the isotope composition of soil water, evaporative enrichment in transpiring leaves, and isotopic exchange between oxygen atoms in organic molecules and local water in the cells in which organic molecules are formed. This review presents current theoretical models describing the influences on δ18Op, using recently published experimental work to outline strengths and weaknesses in the models. The potential and realised applications of the technique are described.

Relationship between δ18O and minor element composition of Terebratalia transversa

2007 ◽  
Vol 98 (3-4) ◽  
pp. 443-449 ◽  
Author(s):  
Maggie Cusack ◽  
David Parkinson ◽  
Alberto Pérez-Huerta ◽  
Jennifer England ◽  
Gordon B. Curry ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Composition ◽  
Seawater Temperature ◽  
Minor Element ◽  
Oxygen Isotope Composition ◽  
Secondary Layer ◽  
Vital Effects ◽  
Stable Oxygen ◽  
Temperature Proxy ◽  
Isotope Equilibrium

ABSTRACTWith their extensive fossil record and shells of stable low-Mg calcite, rhynchonelliform brachiopods are attractive sources of climate information via seawater temperature proxies such as stable oxygen isotope composition. In Terebratalia transversa (Sowerby) there is a progression towards oxygen isotope equilibrium in the calcite of the innermost secondary layer. This study confirms the lack of any vital effects influencing oxygen isotope composition of T. transversa, even in specialised areas of the innermost secondary layer. Calcite Mg/Ca ratio is another potential seawater temperature proxy, that has the advantage of not being influenced by salinity. Mg concentrations measured by electron microprobe analyses indicate that there is no concomitant decrease in Mg concentration towards the inner secondary layer, associated with the progressive shift towards oxygen isotope equilibrium. Mg distribution is heterogeneous throughout the shell and correlates with that of sulphur, which may be a proxy for organic components, suggesting that some of the Mg may not be in the calcite lattice. It is essential therefore, to determine the chemical environment of the magnesium ions to avoid any erroneous temperature extrapolations in brachiopods or any other calcite biomineral.

scholarly journals 14C Analyses of Groundwater From the Botucatu Aquifer System in Brazil

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 926-933 ◽  
Author(s):  
Annkarin Aurelia ◽  
Kimmelmann E Silva ◽  
Aldo da Cunha Rebouças ◽  
Maria Marlucia ◽  
Freitas Santiago
Keyword(s):  
Stable Isotope ◽  
Oxygen Isotope ◽  
Gradual Increase ◽  
Isotope Composition ◽  
Stable Isotope Composition ◽  
Stable Oxygen Isotope ◽  
Aquifer System ◽  
Groundwater Samples ◽  
Stable Oxygen ◽  
Different Origins

Measurements of 14C activity as well as determinations of the stable isotope composition (18O, 2H and 13C) of groundwater samples were made to investigate the flow path, origin, recharge and age of the Botucatu Aquifer System in Brazil, between 1984 and 1987. The stable oxygen isotope composition reflects infiltration during several climatic recharge conditions. Measured 14C activities range from 0.4 to 94.2% modern. δ13C values enable us to distinguish two groundwater types of different origins. There is a gradual increase of 14C ages from the outcrop area towards the central part of the basin, associated with a progression of the confining conditions. Anomalous fluoride contents seem to be correlated with high 14C ages of the groundwater. The reliability of the 14C data is discussed.

scholarly journals Composite data set of last glacial Dansgaard/Oeschger events obtained from stable oxygen isotopes in speleothems

2020 ◽  
Author(s):  
Jens Fohlmeister ◽  
Niklas Bores ◽  
Norbert Marwan ◽  
Andrea Columbu ◽  
Kira Rehfeld ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Composition ◽  
Stable Oxygen Isotopes ◽  
Data Set ◽  
Last Glacial Period ◽  
Stable Oxygen Isotope ◽  
Last Glacial ◽  
Stable Oxygen ◽  
The Last Glacial ◽  
Millennial Scale

<p>Millennial scale climate variations called Dansgaard-Oeschger cycles occurred frequently during the last glacial, with their central impact on climate in the North Atlantic region. These events are, for example, well captured by the stable oxygen isotope composition in continental ice from Greenland, but also in records from other regions. Recently, it has been shown that a water isotope enabled general circulation model is able to reproduce those millennial-scale oxygen isotope changes from Greenland (Sime et al., 2019). On a global scale, this isotope-enabled model has not been tested in its performance, as stable oxygen isotope records covering those millennial scale variability were so far missing or not systematically compiled.</p><p>In the continental realm, speleothems provide an excellent archive to store the oxygen isotope composition in precipitation during those rapid events. Here, we use a newly established speleothem data base (SISAL, Atsawawaranunt et al., 2018) from which we extracted 126 speleothems, growing in some interval during the last glacial period. We established an automated method for identification of the rapid onsets of interstadials. While the applied method seems to be not sensitive enough to capture all warming events due to the diverse characteristics of speleothem data (temporal resolution, growth stops and dating uncertainties) and low signal-to-noise-ratio, we are confident that our method is not detecting variations in stable oxygen isotopes that do not reflect stadial-interstadial transitions. Finally, all found transitions were stacked for individual speleothem records in order to provide a mean stadial-interstadial transition for various continental locations. This data set could be useful for future comparison of isotope enabled model simulations and corresponding observations, and to test their ability in modelling millennial scale variability.</p><p> </p><p>References</p><p>Atsawawaranunt, et al. (2018). The SISAL database: A global resource to document oxygen and carbon isotope records from speleothems. Earth System Science Data 10, 1687–1713</p><p>Sime, L. C., Hopcroft, P. O., Rhodes, R. H. (2019). Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period. PNAS 116, 4099-4104.</p>

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