{"refrec":{"BRefID":231235,"RR":"<b>Blaga, C.I.; Reichart, G.J.; Vissers, E.W.; Lotter, A.F.; Anselmetti, F.S.; Sinninghe Damsté, J.S.; Sinninghe Damsté, J.S.</b> (2011). Seasonal changes in glycerol dialkyl glycerol tetraether concentrations and fluxes in a perialpine lake: Implications for the use of the TEX<sub>86</sub> and BIT proxies. <i>Geochim. Cosmochim. Acta 75(21)</i>: 6416-6428. <a href=\"http://dx.doi.org/10.1016/j.gca.2011.08.016\" target=\"_blank\">dx.doi.org/10.1016/j.gca.2011.08.016</a>","BEntID":222947,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 75(21)</i>: 6416-6428. <a href=\"https://dx.doi.org/10.1016/j.gca.2011.08.016\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2011.08.016</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Blaga, C.I.; Reichart, G.J.; Vissers, E.W.; Lotter, A.F.; Anselmetti, F.S.; Sinninghe Damsté, J.S.; Sinninghe Damsté, J.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Blaga, C.I. <i>et al.</i>","Englishabstract":"To determine where and when glycerol dialkyl glycerol tetraether (GDGT) membrane lipids in lakes are produced, we collected descending particles in Lake Lucerne (Switzerland) using two sediment traps (at 42 and 72 m water depth) with a monthly resolution from January 2008 to late March 2009. Suspended particulate matter (SPM) was monthly filtered from the water column at three different depths. The potential application of GDGTs in palaeoenvironmental and palaeoclimatic reconstructions was investigated by comparing core lipids and their relative GDGT distribution, with lake water temperatures throughout the year. Fluxes of GDGTs and their concentrations in the water column vary according to a seasonal pattern, showing a similar trend in the SPM and sediment traps. Fluxes and concentrations of isoprenoid GDGTs increase with depth, maximum values being observed in the deeper part of the water column, indicating production of isoprenoid GDGTs by Thaumarchaeota in the deep (similar to 50 m), aphotic zone of Lake Lucerne. The flux-weighted averages of the proxies TEX86 (0.27) and BIT (0.03) based on the total extracted GDGTs are similar at both trap depths. A sediment core from the same location showed that in the first few centimetres of the core TEX86 and BIT values of 0.29 and 0.07, respectively, are similar to those recorded for descending particles and SPM, indicating that the sedimentary TEX86 records the annual mean temperature of deeper waters in Lake Lucerne. TEX86 values are slightly higher below 20 cm in the core. This offset is interpreted to be caused by the present-day trophic state of the lake, which probably resulted in a deeper niche of the Thaumarchaeota. Branched GDGTs represent only a minor fraction of the total GDGTs in the lake and their origin remains unclear. Our data reveal that GDGTs in lakes have a large potential for palaeoclimatic studies but indicate that knowledge of the system is important for accurate interpretation.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Seasonal changes in glycerol dialkyl glycerol tetraether concentrations and fluxes in a perialpine lake: Implications for the use of the TEX<sub>86</sub> and BIT proxies","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2014-06-04","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000296566600009","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.gca.2011.08.016"},"refs":null,"anarec":{"AnaID":231235,"PubliDate":2011,"Pagination":"6416-6428","XtraPublOfAnaID":null,"ISBN":null,"Volume":"75","Issue":"21","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. 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