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Article: Appraisal of alkenone- and archaeal ether-based salinity indicators in mid-latitude Asian lakes

TitleAppraisal of alkenone- and archaeal ether-based salinity indicators in mid-latitude Asian lakes
Authors
Keywordsalkenones
archaeal ether lipids
lake sediments
mid-latitude Asia
salinity indicator
Issue Date2020
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth and Planetary Science Letters, 2020, v. 538, p. article no. 116236 How to Cite?
AbstractLake water salinity, an important indicator of lake hydrological conditions, is critical to deciphering terrestrial paleoclimatic and paleoenvironmental changes. The proportion of C37:4 alkenone to total C37 alkenones (%C37:4) and the relative abundance of archaeol to caldarchaeol (ACE) are promising salinity indices in lacustrine settings. Developing regional calibrations for both indicators is challenging due to limited datasets and a poor understanding of the factors that influence them. Here we present %C37:4 and ACE data collected from 55 lakes in mid-latitude Asia with a wide salinity range, to evaluate how well the two proxies can be correlated with salinity and to infer potential influencing factors. The %C37:4 values only show a weak negative correlation with salinity from all investigated lakes. The occurrence of C37:3 alkenone isomer and abnormal values in the alkenone C37/C38 ratio might signal species shifts or environmental factors that compromise the %C37:4-salinity relationship in our data set. Seasonal bias in alkenone production could further obscure this %C37:4-salinity relationship. A stronger relationship emerges after removing samples influenced by these factors: %C37:4=−8.56⁎log10 (salinity) + 80.6, r2=0.62, n=37; or %C37:4=−13.46⁎log10 (salinity) + 101.48, with uncertainty in both variables considered. The ACE values show a strong positive correlation with salinity from all investigated lakes: ACE=2.27⁎10−4⁎salinity+25.4, r2=0.75, n=68; or ACE=1.86⁎10−4⁎salinity+38.1, with uncertainty in both variables considered. However, substantial deviations of the ACE values in low salinity range (<60,000 mg/L) and majority of the ACE shift in the range of 60,000–100,000 mg/L suggest that the ACE primarily responds to Euryarchaeota/Archaea community changes when a salinity threshold is crossed. Accordingly, both lake salinity indicators have the potential to reconstruct past salinity changes when their influencing factors could be constrained, and the two independent proxies, when they are used together, could further refine salinity reconstructions. © 2020 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/284820
ISSN
2019 Impact Factor: 4.823
2015 SCImago Journal Rankings: 3.628
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHe, Y-
dc.contributor.authorWang, H-
dc.contributor.authorMENG, B-
dc.contributor.authorLiu, H-
dc.contributor.authorZhou, A-
dc.contributor.authorSong, M-
dc.contributor.authorKolpakova, M-
dc.contributor.authorKrivonogov, S-
dc.contributor.authorLiu, W-
dc.contributor.authorLiu, Z-
dc.date.accessioned2020-08-07T09:03:02Z-
dc.date.available2020-08-07T09:03:02Z-
dc.date.issued2020-
dc.identifier.citationEarth and Planetary Science Letters, 2020, v. 538, p. article no. 116236-
dc.identifier.issn0012-821X-
dc.identifier.urihttp://hdl.handle.net/10722/284820-
dc.description.abstractLake water salinity, an important indicator of lake hydrological conditions, is critical to deciphering terrestrial paleoclimatic and paleoenvironmental changes. The proportion of C37:4 alkenone to total C37 alkenones (%C37:4) and the relative abundance of archaeol to caldarchaeol (ACE) are promising salinity indices in lacustrine settings. Developing regional calibrations for both indicators is challenging due to limited datasets and a poor understanding of the factors that influence them. Here we present %C37:4 and ACE data collected from 55 lakes in mid-latitude Asia with a wide salinity range, to evaluate how well the two proxies can be correlated with salinity and to infer potential influencing factors. The %C37:4 values only show a weak negative correlation with salinity from all investigated lakes. The occurrence of C37:3 alkenone isomer and abnormal values in the alkenone C37/C38 ratio might signal species shifts or environmental factors that compromise the %C37:4-salinity relationship in our data set. Seasonal bias in alkenone production could further obscure this %C37:4-salinity relationship. A stronger relationship emerges after removing samples influenced by these factors: %C37:4=−8.56⁎log10 (salinity) + 80.6, r2=0.62, n=37; or %C37:4=−13.46⁎log10 (salinity) + 101.48, with uncertainty in both variables considered. The ACE values show a strong positive correlation with salinity from all investigated lakes: ACE=2.27⁎10−4⁎salinity+25.4, r2=0.75, n=68; or ACE=1.86⁎10−4⁎salinity+38.1, with uncertainty in both variables considered. However, substantial deviations of the ACE values in low salinity range (<60,000 mg/L) and majority of the ACE shift in the range of 60,000–100,000 mg/L suggest that the ACE primarily responds to Euryarchaeota/Archaea community changes when a salinity threshold is crossed. Accordingly, both lake salinity indicators have the potential to reconstruct past salinity changes when their influencing factors could be constrained, and the two independent proxies, when they are used together, could further refine salinity reconstructions. © 2020 Elsevier B.V.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl-
dc.relation.ispartofEarth and Planetary Science Letters-
dc.subjectalkenones-
dc.subjectarchaeal ether lipids-
dc.subjectlake sediments-
dc.subjectmid-latitude Asia-
dc.subjectsalinity indicator-
dc.titleAppraisal of alkenone- and archaeal ether-based salinity indicators in mid-latitude Asian lakes-
dc.typeArticle-
dc.identifier.emailLiu, Z: zhliu@hku.hk-
dc.identifier.authorityLiu, Z=rp00750-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.epsl.2020.116236-
dc.identifier.scopuseid_2-s2.0-85082022073-
dc.identifier.hkuros312439-
dc.identifier.volume538-
dc.identifier.spagearticle no. 116236-
dc.identifier.epagearticle no. 116236-
dc.identifier.isiWOS:000525394900026-
dc.publisher.placeNetherlands-
dc.identifier.issnl0012-821X-

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