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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
Title | Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China | ||||||||||
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Authors | |||||||||||
Keywords | Alkenone Biomarker Concentration (composition) Isotopic ratio Lacustrine deposit | ||||||||||
Issue Date | 2011 | ||||||||||
Publisher | Pergamon. 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? | ||||||||||
Abstract | Long-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 Identifier | http://hdl.handle.net/10722/139163 | ||||||||||
ISSN | 2023 Impact Factor: 4.5 2023 SCImago Journal Rankings: 2.278 | ||||||||||
ISI Accession Number ID |
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. | ||||||||||
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Grants |
DC Field | Value | Language |
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dc.contributor.author | Liu, W | en_HK |
dc.contributor.author | Liu, Z | en_HK |
dc.contributor.author | Wang, H | en_HK |
dc.contributor.author | He, Y | en_HK |
dc.contributor.author | Wang, Z | en_HK |
dc.contributor.author | Xu, L | en_HK |
dc.date.accessioned | 2011-09-23T05:46:14Z | - |
dc.date.available | 2011-09-23T05:46:14Z | - |
dc.date.issued | 2011 | en_HK |
dc.identifier.citation | Geochimica Et Cosmochimica Acta, 2011, v. 75 n. 7, p. 1693-1703 | en_HK |
dc.identifier.issn | 0016-7037 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/139163 | - |
dc.description.abstract | Long-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.language | eng | en_US |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca | en_HK |
dc.relation.ispartof | Geochimica et Cosmochimica Acta | en_HK |
dc.subject | Alkenone | - |
dc.subject | Biomarker | - |
dc.subject | Concentration (composition) | - |
dc.subject | Isotopic ratio | - |
dc.subject | Lacustrine deposit | - |
dc.title | Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Liu, Z:zhliu@hku.hk | en_HK |
dc.identifier.authority | Liu, Z=rp00750 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.gca.2010.10.029 | en_HK |
dc.identifier.scopus | eid_2-s2.0-79952444657 | en_HK |
dc.identifier.hkuros | 193869 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-79952444657&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 75 | en_HK |
dc.identifier.issue | 7 | en_HK |
dc.identifier.spage | 1693 | en_HK |
dc.identifier.epage | 1703 | en_HK |
dc.identifier.isi | WOS:000288590200002 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.relation.project | Investigation of Late Holocene Hydrological Changes in Lake Qinghai and Qaidam Basin Using Alkenone D/H Ratios | - |
dc.identifier.scopusauthorid | Liu, W=35734284300 | en_HK |
dc.identifier.scopusauthorid | Liu, Z=16177844800 | en_HK |
dc.identifier.scopusauthorid | Wang, H=49964977800 | en_HK |
dc.identifier.scopusauthorid | He, Y=49963517600 | en_HK |
dc.identifier.scopusauthorid | Wang, Z=7410051130 | en_HK |
dc.identifier.scopusauthorid | Xu, L=35094760400 | en_HK |
dc.identifier.citeulike | 8601421 | - |
dc.identifier.issnl | 0016-7037 | - |