Publication Abstracts

Zhu et al. 2017

Zhu, J., Z. Liu, E.C. Brady, B.L. Otto-Bliesner, S.A. Marcott, J. Zhang, X. Wang, J. Nusbaumer, T.E. Wong, A. Jahn, and D. Noone, 2017: Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an isotope-enabled Earth System Model. Geophys. Res. Lett., 44, no. 24, 12501-12510, doi:10.1002/2017GL076253.

Variations in terrestrial oxygen-isotope reconstructions from ice cores and speleothems have been primarily attributed to climatic changes of surface air temperature, precipitation amount, or atmospheric circulation. Here we demonstrate with the fully coupled isotope-enabled Community Earth System Model an additional process contributing to the oxygen-isotope variations during glacial meltwater events. This process, termed "the direct meltwater effect," involves propagating large amounts of isotopically depleted meltwater throughout the hydrological cycle and is independent of climatic changes. We find that the direct meltwater effect can make up 15-35% of the δ18O signals in precipitation over Greenland and eastern Brazil for large freshwater forcings (0.25-0.50 sverdrup (106 m3/s)). Model simulations further demonstrate that the direct meltwater effect increases with the magnitude and duration of the freshwater forcing and is sensitive to both the location and shape of the meltwater. These new modeling results have important implications for past climate interpretations of δ18O.

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BibTeX Citation

@article{zh00300e,
  author={Zhu, J. and Liu, Z. and Brady, E. C. and Otto-Bliesner, B. L. and Marcott, S. A. and Zhang, J. and Wang, X. and Nusbaumer, J. and Wong, T. E. and Jahn, A. and Noone, D.},
  title={Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an isotope-enabled Earth System Model},
  year={2017},
  journal={Geophys. Res. Lett.},
  volume={44},
  number={24},
  pages={12501--12510},
  doi={10.1002/2017GL076253},
}

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RIS Citation

TY  - JOUR
ID  - zh00300e
AU  - Zhu, J.
AU  - Liu, Z.
AU  - Brady, E. C.
AU  - Otto-Bliesner, B. L.
AU  - Marcott, S. A.
AU  - Zhang, J.
AU  - Wang, X.
AU  - Nusbaumer, J.
AU  - Wong, T. E.
AU  - Jahn, A.
AU  - Noone, D.
PY  - 2017
TI  - Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an isotope-enabled Earth System Model
JA  - Geophys. Res. Lett.
VL  - 44
IS  - 24
SP  - 12501
EP  - 12510
DO  - 10.1002/2017GL076253
ER  -

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