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. Here we demonstrate with the fully coupled isotope‐enabled Community Earth System M...
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ftnanyangtu:oai:dr.ntu.edu.sg:10356/89805 2023-05-15T16:29:15+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 Asian School of the Environment Earth Observatory of Singapore 2018-10-19T06:30:51Z 10 p. application/pdf https://hdl.handle.net/10356/89805 http://hdl.handle.net/10220/46387 https://doi.org/10.1002/2017GL076253 en eng Geophysical Research Letters 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 0094-8276 https://hdl.handle.net/10356/89805 http://hdl.handle.net/10220/46387 doi:10.1002/2017GL076253 © 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: [http://dx.doi.org/10.1002/2017GL076253]. 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. Direct Meltwater Effect Oxygen-isotope Records DRNTU::Science::Geology Journal Article 2018 ftnanyangtu https://doi.org/10.1002/2017GL076253 2020-10-02T00:08:57Z 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. Published version Article in Journal/Newspaper Greenland DR-NTU (Digital Repository at Nanyang Technological University, Singapore) Greenland Geophysical Research Letters 44 24 |
institution |
Open Polar |
collection |
DR-NTU (Digital Repository at Nanyang Technological University, Singapore) |
op_collection_id |
ftnanyangtu |
language |
English |
topic |
Direct Meltwater Effect Oxygen-isotope Records DRNTU::Science::Geology |
spellingShingle |
Direct Meltwater Effect Oxygen-isotope Records DRNTU::Science::Geology 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 |
Direct Meltwater Effect Oxygen-isotope Records DRNTU::Science::Geology |
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. 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. Published version |
author2 |
Asian School of the Environment Earth Observatory of Singapore |
format |
Article in Journal/Newspaper |
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 |
2018 |
url |
https://hdl.handle.net/10356/89805 http://hdl.handle.net/10220/46387 https://doi.org/10.1002/2017GL076253 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Geophysical Research Letters 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 0094-8276 https://hdl.handle.net/10356/89805 http://hdl.handle.net/10220/46387 doi:10.1002/2017GL076253 |
op_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: [http://dx.doi.org/10.1002/2017GL076253]. 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. |
op_doi |
https://doi.org/10.1002/2017GL076253 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
24 |
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1766018940005253120 |