Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model
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...
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Online Access: | http://www.osti.gov/servlets/purl/1441337 https://www.osti.gov/biblio/1441337 https://doi.org/10.1002/2017GL076253 |
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ftosti:oai:osti.gov:1441337 2023-07-30T04:03:52+02:00 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 2022-03-30 application/pdf http://www.osti.gov/servlets/purl/1441337 https://www.osti.gov/biblio/1441337 https://doi.org/10.1002/2017GL076253 unknown http://www.osti.gov/servlets/purl/1441337 https://www.osti.gov/biblio/1441337 https://doi.org/10.1002/2017GL076253 doi:10.1002/2017GL076253 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1002/2017GL076253 2023-07-11T09:26:16Z 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 δ 18 O signals in precipitation over Greenland and eastern Brazil for large freshwater forcings (0.25–0.50 sverdrup (10 6 m 3 /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 δ 18 O. Other/Unknown Material Greenland SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Greenland Geophysical Research Letters 44 24 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES 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 Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
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 δ 18 O signals in precipitation over Greenland and eastern Brazil for large freshwater forcings (0.25–0.50 sverdrup (10 6 m 3 /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 δ 18 O. |
author |
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 |
author_facet |
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 |
author_sort |
Zhu, Jiang |
title |
Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model |
title_short |
Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model |
title_full |
Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model |
title_fullStr |
Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model |
title_full_unstemmed |
Investigating the Direct Meltwater Effect in Terrestrial Oxygen-Isotope Paleoclimate Records Using an Isotope-Enabled Earth System Model |
title_sort |
investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an isotope-enabled earth system model |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1441337 https://www.osti.gov/biblio/1441337 https://doi.org/10.1002/2017GL076253 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
http://www.osti.gov/servlets/purl/1441337 https://www.osti.gov/biblio/1441337 https://doi.org/10.1002/2017GL076253 doi:10.1002/2017GL076253 |
op_doi |
https://doi.org/10.1002/2017GL076253 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
24 |
_version_ |
1772814996690960384 |