edu.ucar.opensky::articles:21306 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T16:08:00.029767 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d73x898q Investigating the direct meltwater effect in terrestrial oxygen-isotope paleoclimate records using an Isotope-Enabled Earth System Model 2017-12-28T00:00:00Z publication https://n2t.org/ark:/85065/d73x898q https://doi.org/10.1002/2017GL076253 Zhu, J. author Liu, Z. author Brady, Esther C. author Otto-Bliesner, Bette author Marcott, S. A. author Zhang, J. author Wang, X. author Nusbaumer, J. author Wong, T. E. author Jahn, A. author Noone, D. author UCAR/NCAR - Library publisher 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2017 American Geophysical Union. None eng geoscientificInformation