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Investigating the Direct Meltwater Effect in Terrestrial Oxygenâ Isotope Paleoclimate Records Using an Isotopeâ Enabled Earth System Model
dc.contributor.authorZhu, Jiang
dc.contributor.authorLiu, Zhengyu
dc.contributor.authorBrady, Esther C.
dc.contributor.authorOtto‐bliesner, Bette L.
dc.contributor.authorMarcott, Shaun A.
dc.contributor.authorZhang, Jiaxu
dc.contributor.authorWang, Xianfeng
dc.contributor.authorNusbaumer, Jesse
dc.contributor.authorWong, Tony E.
dc.contributor.authorJahn, Alexandra
dc.contributor.authorNoone, David
dc.date.accessioned2018-02-05T16:32:13Z
dc.date.available2019-01-07T18:34:37Zen
dc.date.issued2017-12-28
dc.identifier.citationZhu, 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 (2017). "Investigating the Direct Meltwater Effect in Terrestrial Oxygenâ Isotope Paleoclimate Records Using an Isotopeâ Enabled Earth System Model." Geophysical Research Letters 44(24): 12,501-12,510.
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/2027.42/141374
dc.description.abstractVariations in terrestrial oxygenâ 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 isotopeâ enabled Community Earth System Model an additional process contributing to the oxygenâ isotope variations during glacial meltwater events. This process, termed â the direct meltwater effect,â 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 15â 35% of the δ18O signals in precipitation over Greenland and eastern Brazil for large freshwater forcings (0.25â 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.Key PointsA portion of the δ18O signal in landâ based paleoclimate proxies can be attributed to the direct meltwater effect instead of climatic changesThe direct meltwater effect can make up 15â 35% of the δ18O signals in precipitation in Greenland and eastern Brazil for large meltwater eventsThe direct meltwater effect increases with the magnitude and duration of the freshwater forcing and is sensitive to location and shape dependent
dc.publisherThe University of Wisconsin â Madison
dc.publisherWiley Periodicals, Inc.
dc.subject.otheroxygenâ isotope records
dc.subject.otherspeleothem records
dc.subject.othermeltwater
dc.subject.otherdirect meltwater effect
dc.subject.otherice cores
dc.titleInvestigating the Direct Meltwater Effect in Terrestrial Oxygenâ Isotope Paleoclimate Records Using an Isotopeâ Enabled Earth System Model
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141374/1/grl56782_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141374/2/grl56782-sup-0001-Supporting_Information.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141374/3/grl56782.pdf
dc.identifier.doi10.1002/2017GL076253
dc.identifier.sourceGeophysical Research Letters
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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