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Title: Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an isotope-enabled earth system model
Authors: Zhu, Jiang
Liu, Zhengyu
Brady, Esther C.
Otto-Bliesner, Bette L.
Marcott, Shaun A.
Zhang, Jiaxu
Wang, Xianfeng
Nusbaumer, Jesse
Wong, Tony E.
Jahn, Alexandra
Noone, David
Keywords: Direct Meltwater Effect
Oxygen-isotope Records
Issue Date: 2017
Source: Zhu, J., Liu, Z., Brady, E. C., Otto-Bliesner, B. L., Marcott, S. A., Zhang, J., . . . Noone, D. (2017). Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model. Geophysical Research Letters, 44(24), 12501-12510. doi:10.1002/2017GL076253
Series/Report no.: Geophysical Research Letters
Abstract: 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.
ISSN: 0094-8276
DOI: 10.1002/2017GL076253
Rights: © 2017 American Geophysical Union. This paper was published in Geophysical Research Letters and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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