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dc.contributor.authorAmesbury, Matthew J.en_NZ
dc.contributor.authorCharman, Dan J.en_NZ
dc.contributor.authorNewnham, Rewi M.en_NZ
dc.contributor.authorLoader, Nwil J.en_NZ
dc.contributor.authorGoodrich, Jordan Paulen_NZ
dc.contributor.authorRoyles, Jessicaen_NZ
dc.contributor.authorCampbell, David I.en_NZ
dc.contributor.authorKeller, Elizabeth D.en_NZ
dc.contributor.authorBaisden, W. Troyen_NZ
dc.contributor.authorRoland, Thomas P.en_NZ
dc.contributor.authorGallego-Sala, Angela V.en_NZ
dc.contributor.editorVance, Den_NZ
dc.date.accessioned2015-09-09T23:37:09Z
dc.date.available2015-08-14en_NZ
dc.date.available2015-09-09T23:37:09Z
dc.date.issued2015-08-14en_NZ
dc.identifier.citationAmesbury, M. J., Charman, D. J., Newnham, R. M., Loader, N. J., Goodrich, J., Royles, J., … Gallego-Sala, A. V. (2015). Can oxygen stable isotopes be used to track precipitation moisture. Earth and Planetary Science Letters, 430(0012-821X), 149–159. http://doi.org/10.1016/j.epsl.2015.08.015en
dc.identifier.urihttps://hdl.handle.net/10289/9638
dc.description.abstractVariations in the isotopic composition of precipitation are determined by fractionation processes which occur during temperature- and humidity-dependent phase changes associated with evaporation and condensation. Oxygen stable isotope ratios have therefore been frequently used as a source of palaeoclimate data from a variety of proxy archives, which integrate this signal over time. Applications from ombrotrophic peatlands, where the source water used in cellulose synthesis is derived solely from precipitation, have been mostly limited to Northern Hemisphere Sphagnum-dominated bogs, with few in the Southern Hemisphere or in peatlands dominated by vascular plants. New Zealand (NZ) provides an ideal location to undertake empirical research into oxygen isotope fractionation in vascular peatlands because single taxon analysis can be easily carried out, in particular using the preserved root matrix of the restionaceous wire rush (Empodisma spp.) that forms deep Holocene peat deposits throughout the country. Furthermore, large gradients are observed in the mean isotopic composition of precipitation across NZ, caused primarily by the relative influence of different climate modes. Here, we test whether δ18O of Empodisma α-cellulose from ombrotrophic restiad peatlands in NZ can provide a methodology for developing palaeoclimate records of past precipitation δ18O. Surface plant, water and precipitation samples were taken over spatial (six sites spanning >10◦ latitude) and temporal (monthly measurements over one year) gradients. A link between the isotopic composition of root-associated water, the most likely source water for plant growth, and precipitation in both datasets was found. Back-trajectory modelling of precipitation moisture source for rain days prior to sampling showed clear seasonality in the temporal data that was reflected in root-associated water. The link between source water and plant cellulose was less clear, although mechanistic modelling predicted mean cellulose values within published error margins for both datasets. Improved physiological understanding and modelling of δ18O in restiad peatlands should enable use of this approach as a new source of palaeoclimate data to reconstruct changes in past atmospheric circulation.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherElsevieren_NZ
dc.relation.urihttp://www.sciencedirect.com/en_NZ
dc.rights© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
dc.subjectstable isotopesen_NZ
dc.subjectoxygenen_NZ
dc.subjectprecipitation moisture sourceen_NZ
dc.subjectrestiad peatlanden_NZ
dc.subjectNew Zealanden_NZ
dc.titleCan oxygen stable isotopes be used to track precipitation moistureen_NZ
dc.typeJournal Article
dc.identifier.doi10.1016/j.epsl.2015.08.015en_NZ
dc.relation.isPartOfEarth and Planetary Science Lettersen_NZ
pubs.begin-page149
pubs.elements-id129989
pubs.end-page159
pubs.issue0012-821Xen_NZ
pubs.publication-statusPublisheden_NZ
pubs.publisher-urlhttp://www.journals.elsevier.com/earth-and-planetary-science-lettersen_NZ
pubs.volume430en_NZ
uow.identifier.article-noCen_NZ


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