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Article: Downcore variations of carbon reservoir ages linked to lake level changes in northwest China

TitleDowncore variations of carbon reservoir ages linked to lake level changes in northwest China
Authors
KeywordsRadiocarbon dating
Carbon reservoir effect
Lacustrine sediment
Lake status
Last two millennia
Issue Date2020
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/706731/description?navopenmenu=1
Citation
Quaternary Geochronology, 2020, v. 60, p. article no. 101105 How to Cite?
AbstractLacustrine sediments provide an excellent opportunity to study climate change beyond the instrumental period and further to elucidate its intrinsic interactions with ecosystem. However, the radiocarbon (14C)-based chronological framework of such natural archives, on which robust interpretation of geochemical proxies primarily depends, is commonly challenged due to the difficulty in properly correcting carbon reservoir effect. Here we combine new and existing 14C dates on total organic carbon (TOC) in two sediment cores from Lake Qinghai and Manas, northwest China, to evaluate the reservoir effect (expressed by reservoir age, RA) over the past ~1500 years. Generally, these two cores characterize RA values ranging from ~2100 to 4200 and from ~350 to 2100 years respectively. Straightforward comparison with paleorecords generated from the same cores indicates a close correlation between RA changes and lake level fluctuations on multi-centennial timescales. Our results suggest that lake level changes (or hydrological variations), which are expected to control the relative input of terrigenous old carbon, merit careful consideration to reduce dating uncertainty. It is essential to select TOC samples across discrete depths, under the control of similar lake status, to allow comparable RAs and, as a result, to establish reliable chronology.
Persistent Identifierhttp://hdl.handle.net/10722/284815
ISSN
2019 Impact Factor: 3.079
2015 SCImago Journal Rankings: 1.931

 

DC FieldValueLanguage
dc.contributor.authorMENG, B-
dc.contributor.authorZhou, A-
dc.contributor.authorZhang, Y-
dc.contributor.authorSong, M-
dc.contributor.authorLiu, W-
dc.contributor.authorXie, Z-
dc.contributor.authorLi, S-
dc.contributor.authorLiu, Z-
dc.date.accessioned2020-08-07T09:02:59Z-
dc.date.available2020-08-07T09:02:59Z-
dc.date.issued2020-
dc.identifier.citationQuaternary Geochronology, 2020, v. 60, p. article no. 101105-
dc.identifier.issn1871-1014-
dc.identifier.urihttp://hdl.handle.net/10722/284815-
dc.description.abstractLacustrine sediments provide an excellent opportunity to study climate change beyond the instrumental period and further to elucidate its intrinsic interactions with ecosystem. However, the radiocarbon (14C)-based chronological framework of such natural archives, on which robust interpretation of geochemical proxies primarily depends, is commonly challenged due to the difficulty in properly correcting carbon reservoir effect. Here we combine new and existing 14C dates on total organic carbon (TOC) in two sediment cores from Lake Qinghai and Manas, northwest China, to evaluate the reservoir effect (expressed by reservoir age, RA) over the past ~1500 years. Generally, these two cores characterize RA values ranging from ~2100 to 4200 and from ~350 to 2100 years respectively. Straightforward comparison with paleorecords generated from the same cores indicates a close correlation between RA changes and lake level fluctuations on multi-centennial timescales. Our results suggest that lake level changes (or hydrological variations), which are expected to control the relative input of terrigenous old carbon, merit careful consideration to reduce dating uncertainty. It is essential to select TOC samples across discrete depths, under the control of similar lake status, to allow comparable RAs and, as a result, to establish reliable chronology.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/706731/description?navopenmenu=1-
dc.relation.ispartofQuaternary Geochronology-
dc.subjectRadiocarbon dating-
dc.subjectCarbon reservoir effect-
dc.subjectLacustrine sediment-
dc.subjectLake status-
dc.subjectLast two millennia-
dc.titleDowncore variations of carbon reservoir ages linked to lake level changes in northwest China-
dc.typeArticle-
dc.identifier.emailZhang, Y: ychzhang@hku.hk-
dc.identifier.emailLi, S: shli@hku.hk-
dc.identifier.emailLiu, Z: zhliu@hku.hk-
dc.identifier.authorityLi, S=rp00740-
dc.identifier.authorityLiu, Z=rp00750-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.quageo.2020.101105-
dc.identifier.scopuseid_2-s2.0-85087297028-
dc.identifier.hkuros312441-
dc.identifier.volume60-
dc.identifier.spagearticle no. 101105-
dc.identifier.epagearticle no. 101105-
dc.publisher.placeNetherlands-

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