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  • 1
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    Isotope record in a stalagmite from northeastern India through the last deglaciation (2017)
    PANGAEA
    In:  Supplement to: Lechleitner, Franziska A; Breitenbach, Sebastian F M; Cheng, Hai; Plessen, Birgit; Rehfeld, Kira; Goswami, Bedartha; Marwan, Norbert; Eroglu, Denize; Adkins, Jess F; Haug, Gerald H (2017): Climatic and in-cave influences on d18O and d13C in a stalagmite from northeastern India through the last deglaciation. Quaternary Research, 88(03), 458-471, https://doi.org/10.1017/qua.2017.72
    Details
    Publication Date: 2024-03-08
    Description: Northeastern (NE) India experiences extraordinarily pronounced seasonal climate, governed by the Indian summer monsoon (ISM). The vulnerability of this region to floods and droughts calls for detailed and highly resolved paleoclimate reconstructions to assess the recurrence rate and driving factors of ISM changes. We use stable oxygen and carbon isotope ratios (d18O and d13C) from stalagmite MAW-6 from Mawmluh Cave to infer climate and environmental conditions in NE India over the last deglaciation (16-6ka). We interpret stalagmite d18O as reflecting ISM strength, whereas d13C appears to be driven by local hydroclimate conditions. Pronounced shifts in ISM strength over the deglaciation are apparent from the d18O record, similarly to other records from monsoonal Asia. The ISM is weaker during the late glacial (LG) period and the Younger Dryas, and stronger during the Bølling-Allerød and Holocene. Local conditions inferred from the d13C record appear to have changed less substantially over time, possibly related to the masking effect of changing precipitation seasonality. Time series analysis of the d18O record reveals more chaotic conditions during the late glacial and higher predictability during the Holocene, likely related to the strengthening of the seasonal recurrence of the ISM with the onset of the Holocene.
    Keywords: MAW-6; Meghalaya Plateau, Northeast India; Speleothem sample; SPS
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Stable oxygen and carbon isotope record of stalagmite MAW-6 (2017)
    PANGAEA
    Details
    Publication Date: 2024-03-08
    Keywords: AGE; DISTANCE; Ice volume corrected; MAW-6; Meghalaya Plateau, Northeast India; Speleothem sample; SPS; δ13C, carbonate; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 9115 data points
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  • 3
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    U-Th dating information of stalagmite MAW-6 (2017)
    PANGAEA
    Details
    Publication Date: 2024-03-08
    Keywords: Age, 230Thorium; Age, dated; Age, dated standard error; DISTANCE; MAW-6; Meghalaya Plateau, Northeast India; Sample code/label; Speleothem sample; SPS; Thorium-230/Thorium-232 atomic ratio; Thorium-230/Thorium-232 atomic ratio, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, error, relative; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 408 data points
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  • 4
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    A complete representation of uncertainties in layer-counted paleoclimatic archives (2017)
    Copernicus
    Details
    Publication Date: 2017-09-19
    Description: Accurate time series representation of paleoclimatic proxy records is challenging because such records involve dating errors in addition to proxy measurement errors. Rigorous attention is rarely given to age uncertainties in paleoclimatic research, although the latter can severely bias the results of proxy record analysis. Here, we introduce a Bayesian approach to represent layer-counted proxy records – such as ice cores, sediments, corals, or tree rings – as sequences of probability distributions on absolute, error-free time axes. The method accounts for both proxy measurement errors and uncertainties arising from layer-counting-based dating of the records. An application to oxygen isotope ratios from the North Greenland Ice Core Project (NGRIP) record reveals that the counting errors, although seemingly small, lead to substantial uncertainties in the final representation of the oxygen isotope ratios. In particular, for the older parts of the NGRIP record, our results show that the total uncertainty originating from dating errors has been seriously underestimated. Our method is next applied to deriving the overall uncertainties of the Suigetsu radiocarbon comparison curve, which was recently obtained from varved sediment cores at Lake Suigetsu, Japan. This curve provides the only terrestrial radiocarbon comparison for the time interval 12.5–52.8 kyr BP. The uncertainties derived here can be readily employed to obtain complete error estimates for arbitrary radiometrically dated proxy records of this recent part of the last glacial interval.
    Print ISSN: 1814-9324
    Electronic ISSN: 1814-9332
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 5
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    Unknown
    A complete representation of uncertainties in layer-counted paleoclimatic archives (2017)
    Copernicus
    Details
    Publication Date: 2017-05-19
    Description: Accurate time series representation of paleoclimatic proxy records is challenging because such records involve dating errors in addition to proxy measurement errors. Rigorous attention is rarely given to age uncertainties in paleoclimatic research, although the latter can severely bias the results of proxy record analysis. Here, we introduce a Bayesian approach to represent layer-counted proxy records – such as ice cores, sediments, corals or tree rings – as sequences of probability distributions on absolute, error-free time axes. The method accounts for both proxy measurement errors and uncertainties arising from layer-counting–based dating of the records. An application to oxygen isotope ratios from the North Greenland Ice Core Project (NGRIP) record reveals that the counting errors, although seemingly small, lead to substantial uncertainties in the final representation of the oxygen isotope ratios. In particular, for the older parts of the NGRIP record, our results show that the total uncertainty originating from dating errors has been seriously underestimated. Our method is next applied to deriving the overall uncertainties of the Suigetsu radiocarbon calibration curve, which was recently obtained from varved sediment cores at Lake Suigetsu, Japan. This curve provides the only terrestrial radiocarbon calibration for the time interval 12.5–52.8 kyr BP. The uncertainties derived here can be readily employed to obtain complete error estimates for arbitrary radiometrically dated proxy records of this recent part of the last glacial interval.
    Print ISSN: 1814-9340
    Electronic ISSN: 1814-9359
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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