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...
Published in: | Geophysical Research Letters |
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Language: | English |
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2017
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Online Access: | https://doi.org/10.1002/2017GL076253 |
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ftncar:oai:drupal-site.org:articles_21306 2023-09-05T13:19:53+02:00 Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an Isotope-Enabled Earth System Model Zhu, Jiang (author) Liu, Zhengyu (author) Brady, Esther C. (author) Otto-Bliesner, Bette L. (author) Marcott, Shaun A. (author) Zhang, Jiaxu (author) Wang, Xianfeng (author) Nusbaumer, Jesse (author) Wong, Tony E. (author) Jahn, Alexandra (author) Noone, David (author) 2017-12-28 https://doi.org/10.1002/2017GL076253 en eng Geophysical Research Letters--Geophys. Res. Lett.--00948276 articles:21306 ark:/85065/d73x898q doi:10.1002/2017GL076253 Copyright 2017 American Geophysical Union. article Text 2017 ftncar https://doi.org/10.1002/2017GL076253 2023-08-14T18:48:29Z 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 O-18 signals in precipitation over Greenland and eastern Brazil for large freshwater forcings (0.25-0.50sverdrup (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 delta O-18. Article in Journal/Newspaper Greenland OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Greenland Geophysical Research Letters 44 24 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
language |
English |
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 O-18 signals in precipitation over Greenland and eastern Brazil for large freshwater forcings (0.25-0.50sverdrup (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 delta O-18. |
author2 |
Zhu, Jiang (author) Liu, Zhengyu (author) Brady, Esther C. (author) Otto-Bliesner, Bette L. (author) Marcott, Shaun A. (author) Zhang, Jiaxu (author) Wang, Xianfeng (author) Nusbaumer, Jesse (author) Wong, Tony E. (author) Jahn, Alexandra (author) Noone, David (author) |
format |
Article in Journal/Newspaper |
title |
Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an Isotope-Enabled Earth System Model |
spellingShingle |
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 |
2017 |
url |
https://doi.org/10.1002/2017GL076253 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Geophysical Research Letters--Geophys. Res. Lett.--00948276 articles:21306 ark:/85065/d73x898q doi:10.1002/2017GL076253 |
op_rights |
Copyright 2017 American Geophysical Union. |
op_doi |
https://doi.org/10.1002/2017GL076253 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
24 |
_version_ |
1776200668980183040 |