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  • 1
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    Stable water isotopes in the MITgcm (2017)
    Copernicus
    Details
    Publication Date: 2017-08-25
    Description: We present the first results of the implementation of stable water isotopes in the Massachusetts Institute of Technology general circulation model (MITgcm). The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), while the fractionation during evaporation is treated explicitly in the MITgcm. Results of the equilibrium simulation under pre-industrial conditions are compared to observational data and measurements of plankton tow records (the oxygen isotopic composition of planktic foraminiferal calcite). The broad patterns and magnitude of the stable water isotopes in annual mean seawater are well captured in the model, both at the sea surface as well as in the deep ocean. However, the surface water in the Arctic Ocean is not depleted enough, due to the absence of highly depleted precipitation and snowfall. A model–data mismatch is also recognizable in the isotopic composition of the seawater–salinity relationship in midlatitudes that is mainly caused by the coarse grid resolution. Deep-ocean characteristics of the vertical water mass distribution in the Atlantic Ocean closely resemble observational data. The reconstructed δ18Oc at the sea surface shows a good agreement with measurements. However, the model–data fit is weaker when individual species are considered and deviations are most likely attributable to the habitat depth of the foraminifera. Overall, the newly developed stable water isotope package opens wide prospects for long-term simulations in a paleoclimatic context.
    Print ISSN: 1991-959X
    Electronic ISSN: 1991-9603
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 2
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    Stable water isotopes in the MITgcm (checkpoint 64w) (2017)
    Copernicus
    Details
    Publication Date: 2017-02-21
    Description: We present the first results of the implementation of stable water isotopes in the ocean general circulation model MITgcm. The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), while the fractionation during evaporation is treated explicitly in the MITgcm. Results of the equilibrium simulation under pre-industrial conditions are compared to observational data and paleoclimate records (the oxygen isotopic composition of planktic foraminiferal calcite). The broad patterns and magnitude of the stable water isotopes in annual mean seawater are well captured in the model, both at the sea surface as well as in the deep ocean. However, the surface water in the Arctic Ocean is not depleted enough, due to the absence of highly depleted precipitation and snow fall and slightly enriched river runoff. This shortcoming is also recognizable in the isotopic composition of the seawater-salinity relationship in mid-latitudes. Deep ocean characteristics of the vertical water mass distribution in the Atlantic Ocean closely resemble observational data. Apart from the systematic offset of the modeled oxygen isotopic composition of planktic foraminiferal calcite towards lower values, the comparison with proxy data shows a good agreement. We summarize that the offset is mainly caused by gametogenic calcification and a matter of choice of the applied paleotemperature equation. Overall, the newly developed stable water isotope package opens wide prospects for long-term simulations in a paleoclimatic context.
    Print ISSN: 1991-9611
    Electronic ISSN: 1991-962X
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 3
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    Stable water isotopes in the MITgcm (2017)
    Copernicus Publications (EGU)
    In:  Geoscientific Model Development, 10 (8). pp. 3125-3144.
    Details
    Publication Date: 2020-02-06
    Description: We present the first results of the implementation of stable water isotopes in the Massachusetts Institute of Technology general circulation model (MITgcm). The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), while the fractionation during evaporation is treated explicitly in the MITgcm. Results of the equilibrium simulation under pre-industrial conditions are compared to observational data and measurements of plankton tow records (the oxygen isotopic composition of planktic foraminiferal calcite). The broad patterns and magnitude of the stable water isotopes in annual mean seawater are well captured in the model, both at the sea surface as well as in the deep ocean. However, the surface water in the Arctic Ocean is not depleted enough, due to the absence of highly depleted precipitation and snowfall. A model–data mismatch is also recognizable in the isotopic composition of the seawater–salinity relationship in midlatitudes that is mainly caused by the coarse grid resolution. Deep-ocean characteristics of the vertical water mass distribution in the Atlantic Ocean closely resemble observational data. The reconstructed δ18Oc at the sea surface shows a good agreement with measurements. However, the model–data fit is weaker when individual species are considered and deviations are most likely attributable to the habitat depth of the foraminifera. Overall, the newly developed stable water isotope package opens wide prospects for long-term simulations in a paleoclimatic context.
    Type: Article , PeerReviewed
    Format: text
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  • 4
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    Median age, benthic oxygen isotope ratios, and 95% error margin of sediment core GeoB9510-1 (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 295; AGE; Center for Marine Environmental Sciences; Cibicidoides pachyderma, δ18O; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Foraminifera, benthic δ18O; GeoB9510-1; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); Quantile (Q0.025); Quantile (Q0.975); SL
    Type: Dataset
    Format: text/tab-separated-values, 190 data points
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  • 5
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    Benthic oxygen isotope ratios from a transect of five gravity cores off NW Africa (2018)
    PANGAEA
    In:  Supplement to: Völpel, Rike; Mulitza, Stefan; Paul, A; Lynch-Stieglitz, Jean; Schulz, Michael (2019): Water Mass Versus Sea Level Effects on Benthic Foraminiferal Oxygen Isotope Ratios in the Atlantic Ocean During the LGM. Paleoceanography and Paleoclimatology, 34(1), 98-121, https://doi.org/10.1029/2018PA003359
    Details
    Publication Date: 2023-06-21
    Description: Depth transects of benthic foraminiferal oxygen isotopes from the Atlantic Ocean show that glacial‐interglacial changes are larger at deep (〉 ~2000 m) than at intermediate water levels. Our model results suggest that the smaller changes in the upper 1000 m of the water column are a result of the glacial sea‐level lowering of about 120 m, leading to warmer temperatures of around 1 °C and hence a smaller glacial‐interglacial stable oxygen isotope difference. In contrast, a shoaling of the water‐mass boundary to ~2000 m water depth between the northern source and southern source water is accompanied by the expansion of a cold (close to the freezing point) southern source water in the abyssal ocean, increasing the oxygen isotope values of benthic foraminifera from the LGM in the deep Atlantic. These two effects explain the different amplitudes of glacial‐interglacial stable oxygen isotope differences in the upper and deeper water column of the Atlantic Ocean.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 6
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    Median age, benthic oxygen isotope ratios, and 95% error margin of sediment core GeoB9526-5 (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 311; AGE; Center for Marine Environmental Sciences; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; GeoB9526-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); Quantile (Q0.025); Quantile (Q0.975); SL
    Type: Dataset
    Format: text/tab-separated-values, 201 data points
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  • 7
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    Median age, benthic oxygen isotope ratios, and 95% error margin of sediment core GeoB9512-5 (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 297; AGE; Center for Marine Environmental Sciences; Cibicidoides pachyderma, δ18O; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Foraminifera, benthic δ18O; GeoB9512-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); Quantile (Q0.025); Quantile (Q0.975); SL
    Type: Dataset
    Format: text/tab-separated-values, 293 data points
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  • 8
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    Median age, benthic oxygen isotope ratios, and 95% error margin of sediment core GeoB9508-5 (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 293; AGE; Center for Marine Environmental Sciences; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; GeoB9508-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); Quantile (Q0.025); Quantile (Q0.975); SL
    Type: Dataset
    Format: text/tab-separated-values, 489 data points
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  • 9
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    Median age, benthic oxygen isotope ratios, and 95% error margin of sediment core GeoB9513-3 (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 298; AGE; Center for Marine Environmental Sciences; Cibicidoides pachyderma, δ18O; DEPTH, sediment/rock; GeoB9513-3; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); Quantile (Q0.025); Quantile (Q0.975); SL
    Type: Dataset
    Format: text/tab-separated-values, 141 data points
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