Late-glacial to late-Holocene shifts in global precipitation δ18O

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dc.contributor.authorJesechko, Sen_AU
dc.contributor.authorLechler, Aen_AU
dc.contributor.authorPausata, FSRen_AU
dc.contributor.authorFawcett, PJen_AU
dc.contributor.authorGleeson, Ten_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorGalewsky, Jen_AU
dc.contributor.authorLeGrande, ANen_AU
dc.contributor.authorRisi, Cen_AU
dc.contributor.authorSharp, ZDen_AU
dc.contributor.authorWelker, JMen_AU
dc.contributor.authorWerner, Men_AU
dc.contributor.authorYoshimura, Ken_AU
dc.date.accessioned2021-12-06T23:24:43Zen_AU
dc.date.available2021-12-06T23:24:43Zen_AU
dc.date.issued2015-10-14en_AU
dc.date.statistics2021-10-21en_AU
dc.description.abstractReconstructions of Quaternary climate are often based on the isotopic content of paleo-precipitation preserved in proxy records. While many paleo-precipitation isotope records are available, few studies have synthesized these dispersed records to explore spatial patterns of late-glacial precipitation δ18O. Here we present a synthesis of 86 globally distributed groundwater (n = 59), cave calcite (n = 15) and ice core (n = 12) isotope records spanning the late-glacial (defined as ~ 50 000 to ~ 20 000 years ago) to the late-Holocene (within the past ~ 5000 years). We show that precipitation δ18O changes from the late-glacial to the late-Holocene range from −7.1 ‰ (δ18Olate-Holocene > δ18Olate-glacial) to +1.7 ‰ (δ18Olate-glacial > δ18Olate-Holocene), with the majority (77 %) of records having lower late-glacial δ18O than late-Holocene δ18O values. High-magnitude, negative precipitation δ18O shifts are common at high latitudes, high altitudes and continental interiors (δ18Olate-Holocene > δ18Olate-glacial by more than 3 ‰). Conversely, low-magnitude, positive precipitation δ18O shifts are concentrated along tropical and subtropical coasts (δ18Olate-glacial > δ18Olate-Holocene by less than 2 ‰). Broad, global patterns of late-glacial to late-Holocene precipitation δ18O shifts suggest that stronger-than-modern isotopic distillation of air masses prevailed during the late-glacial, likely impacted by larger global temperature differences between the tropics and the poles. Further, to test how well general circulation models reproduce global precipitation δ18O shifts, we compiled simulated precipitation δ18O shifts from five isotope-enabled general circulation models simulated under recent and last glacial maximum climate states. Climate simulations generally show better inter-model and model-measurement agreement in temperate regions than in the tropics, highlighting a need for further research to better understand how inter-model spread in convective rainout, seawater δ18O and glacial topography parameterizations impact simulated precipitation δ18O. Future research on paleo-precipitation δ18O records can use the global maps of measured and simulated late-glacial precipitation isotope compositions to target and prioritize field sites. © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 Licence.en_AU
dc.description.sponsorshipWe acknowledge support from the University of Calgary’s Open Access Author’s Fund, an NSERC Discovery Grant held by S. Jasechko, the UNESCO IGCP-618 project (Paleoclimate information obtained from past-recharged groundwater), the G@GPS network, and the Caswell Silver Foundation.en_AU
dc.identifier.citationJasechko, S., Lechler, A., Pausata, F. S. R., Fawcett, P. J., Gleeson, T., Cendón, D. I., Galewsky, J., Le Grande, A. N., Risi, C., Sharp, Z. D., Welker, J. M., Werner, M., & Yoshimura, K. (2015). Late-glacial to late-Holocene shifts in global precipitation δ18O. Climate of the Past, 11(10), 1375-1393. doi:10.5194/cp-11-1375-2015/11/1375/2015/en_AU
dc.identifier.issn1814-9332en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleClimate of the Pasten_AU
dc.identifier.pagination1375-1393en_AU
dc.identifier.urihttps://doi.org/10.5194/cp-11-1375-2015en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12362en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectQuaternary perioden_AU
dc.subjectPrecipitationen_AU
dc.subjectInformationen_AU
dc.subjectDataen_AU
dc.subjectGround wateren_AU
dc.subjectIceen_AU
dc.subjectCalciteen_AU
dc.subjectCavesen_AU
dc.subjectCoastal regionsen_AU
dc.titleLate-glacial to late-Holocene shifts in global precipitation δ18Oen_AU
dc.title.alternativeGlacial–interglacial shifts in global and regional precipitation δ18Oen_AU
dc.typeJournal Articleen_AU
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