Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model

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

doi:10.1002/2017GL076253

Title: Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model

Journal Article · Thu Dec 28 00:00:00 EST 2017 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2017GL076253· OSTI ID:1441337

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Univ. of Wisconsin, Madison, WI (United States). Dept. of Atmospheric and Oceanic Sciences and Center for Climatic Research; Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Earth and Environmental Sciences
The Ohio State Univ., Columbus, OH (United States). Atmospheric Science Program and Dept. of Geography
National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Lab.
Univ. of Wisconsin, Madison, WI (United States). Dept. of Geoscience
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Nanyang Technological Univ. (Singapore). Earth Observatory of Singapore and Asian School of the Environment
NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
Univ. of Colorado, Boulder, CO (United States). Dept. of Computer Science
Univ. of Colorado, Boulder, CO (United States). Dept. of Atmospheric and Oceanic Sciences and Inst. of Arctic and Alpine Research
Oregon State Univ., Corvallis, OR (United States). College of Earth, Ocean, and Atmospheric Sciences

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. In this work, 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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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Science Foundation (NSF); National Center for Atmospheric Research, Boulder, CO (United States)

Grant/Contract Number:: AC52-06NA25396; AGS‐1401778/1401803/1401802; NSFC41630527; 1566432

OSTI ID:: 1441337

Alternate ID(s):: OSTI ID: 1415072

Report Number(s):: LA-UR-18-20282; TRN: US1900907

Journal Information:: Geophysical Research Letters, Vol. 44, Issue 24; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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direct meltwater effect
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Title: Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model

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