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Article: Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China

TitleSalinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China
Authors
KeywordsAlkenone
Biomarker
Concentration (composition)
Isotopic ratio
Lacustrine deposit
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
Citation
Geochimica Et Cosmochimica Acta, 2011, v. 75 n. 7, p. 1693-1703 How to Cite?
AbstractLong-chain alkenones in lacustrine settings are potentially excellent biomarkers for the reconstruction of past terrestrial environmental conditions, and have been found in many different types of lakes around the globe. A wider range of factors influence the occurrence and distribution of alkenones in lake sediments and waters when compared to marine systems. Lake environmental conditions, such as temperature (in particular) and salinity, are among the key factors controlling alkenone distributions in lacustrine settings. Here we investigated alkenone distribution patterns in lakes of the northern Qinghai-Tibetan Plateau, China, and their possible relationship with environmental conditions, by analyzing paired samples of suspended particulate matter in surface waters and surface sediments. Salinity of investigated lake waters ranges from almost 0 to ∼100g/L, while temperature variation among the lakes is minimal, effectively eliminating temperature effects on the alkenone distribution patterns observed here. We show that (1) alkenone concentrations vary substantially between the lakes, yet controlling mechanisms remain elusive; (2) C37/C38 ratios are substantially lower in the lakes of the Qaidam Basin than in the Lake Qinghai region, probably indicating different alkenone producers in the two regions; and (3) large variations in %C37:4 (the percentage of the C37:4 alkenone), determined from both surface waters and sediments, are negatively correlated with salinity. We suggest that the %C37:4 index could be used as a salinity indicator at least on a regional scale, with careful considerations of other potentially complicating factors. However, potential reasons for why salinity could significantly affect %C37:4 values need further investigation. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/139163
ISSN
2015 Impact Factor: 4.315
2015 SCImago Journal Rankings: 3.016
ISI Accession Number ID
Funding AgencyGrant Number
National Science Foundation of China40873011
National Key Funds of China2010CB833400
Chinese Academy of Scienceskzcx2-yw-149
Hong Kong Research Grants CouncilHKU 703809P
Funding Information:

We thank Dr. John Volkman and two anonymous reviewers for their thorough and constructive review which significantly improved the manuscript. This research was supported by the National Science Foundation of China (No. 40873011), National Key Funds of China (No. 2010CB833400), the Chinese Academy of Sciences (No. kzcx2-yw-149) to W. Liu and the Hong Kong Research Grants Council (HKU 703809P) to Z. Liu.

References
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DC FieldValueLanguage
dc.contributor.authorLiu, Wen_HK
dc.contributor.authorLiu, Zen_HK
dc.contributor.authorWang, Hen_HK
dc.contributor.authorHe, Yen_HK
dc.contributor.authorWang, Zen_HK
dc.contributor.authorXu, Len_HK
dc.date.accessioned2011-09-23T05:46:14Z-
dc.date.available2011-09-23T05:46:14Z-
dc.date.issued2011en_HK
dc.identifier.citationGeochimica Et Cosmochimica Acta, 2011, v. 75 n. 7, p. 1693-1703en_HK
dc.identifier.issn0016-7037en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139163-
dc.description.abstractLong-chain alkenones in lacustrine settings are potentially excellent biomarkers for the reconstruction of past terrestrial environmental conditions, and have been found in many different types of lakes around the globe. A wider range of factors influence the occurrence and distribution of alkenones in lake sediments and waters when compared to marine systems. Lake environmental conditions, such as temperature (in particular) and salinity, are among the key factors controlling alkenone distributions in lacustrine settings. Here we investigated alkenone distribution patterns in lakes of the northern Qinghai-Tibetan Plateau, China, and their possible relationship with environmental conditions, by analyzing paired samples of suspended particulate matter in surface waters and surface sediments. Salinity of investigated lake waters ranges from almost 0 to ∼100g/L, while temperature variation among the lakes is minimal, effectively eliminating temperature effects on the alkenone distribution patterns observed here. We show that (1) alkenone concentrations vary substantially between the lakes, yet controlling mechanisms remain elusive; (2) C37/C38 ratios are substantially lower in the lakes of the Qaidam Basin than in the Lake Qinghai region, probably indicating different alkenone producers in the two regions; and (3) large variations in %C37:4 (the percentage of the C37:4 alkenone), determined from both surface waters and sediments, are negatively correlated with salinity. We suggest that the %C37:4 index could be used as a salinity indicator at least on a regional scale, with careful considerations of other potentially complicating factors. However, potential reasons for why salinity could significantly affect %C37:4 values need further investigation. © 2011 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gcaen_HK
dc.relation.ispartofGeochimica et Cosmochimica Actaen_HK
dc.subjectAlkenone-
dc.subjectBiomarker-
dc.subjectConcentration (composition)-
dc.subjectIsotopic ratio-
dc.subjectLacustrine deposit-
dc.titleSalinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.emailLiu, Z:zhliu@hku.hken_HK
dc.identifier.authorityLiu, Z=rp00750en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gca.2010.10.029en_HK
dc.identifier.scopuseid_2-s2.0-79952444657en_HK
dc.identifier.hkuros193869en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79952444657&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume75en_HK
dc.identifier.issue7en_HK
dc.identifier.spage1693en_HK
dc.identifier.epage1703en_HK
dc.identifier.isiWOS:000288590200002-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectInvestigation of Late Holocene Hydrological Changes in Lake Qinghai and Qaidam Basin Using Alkenone D/H Ratios-
dc.identifier.scopusauthoridLiu, W=35734284300en_HK
dc.identifier.scopusauthoridLiu, Z=16177844800en_HK
dc.identifier.scopusauthoridWang, H=49964977800en_HK
dc.identifier.scopusauthoridHe, Y=49963517600en_HK
dc.identifier.scopusauthoridWang, Z=7410051130en_HK
dc.identifier.scopusauthoridXu, L=35094760400en_HK
dc.identifier.citeulike8601421-

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