{"refrec":{"BRefID":230793,"RR":"<b>Jonkers, L.; Jiménez-Amat, P.; Mortyn, P.G.; Brummer, G.-J.A.</b> (2013). Seasonal Mg/Ca variability of <i>N. pachyderma</i> (s) and <i>G. bulloides</i>: Implications for seawater temperature reconstruction. <i>Earth Planet. Sci. Lett. 376</i>: 137-144. <a href=\"http://dx.doi.org/10.1016/j.epsl.2013.06.019\" target=\"_blank\">dx.doi.org/10.1016/j.epsl.2013.06.019</a>","BEntID":222505,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Earth Planet. Sci. Lett. 376</i>: 137-144. <a href=\"https://dx.doi.org/10.1016/j.epsl.2013.06.019\" target=\"_blank\">https://dx.doi.org/10.1016/j.epsl.2013.06.019</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jonkers, L.; Jiménez-Amat, P.; Mortyn, P.G.; Brummer, G.-J.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jonkers, L. <i>et al.</i>","Englishabstract":"Given the importance of high-latitude areas in the ocean-climate system, there is need for a paleothermometer that is reliable at low temperatures. Here we assess the applicability of the Mg/Ca-temperature proxy in colder waters (5-10 degrees C) by comparing for the first time the seasonal Mg/Ca and delta O-18 cycles of N. pachyderma (s) and G. bulloides using a sediment trap time-series from the northern North Atlantic. While both species show indistinguishable seasonal delta O-18 patterns that clearly track the near surface temperature cycle, their Mg/Ca are very different. G. bulloides Mg/Ca is high (2.0-3.1 mmol/mol), but varies in concert with the seasonal temperature cycle. The Mg/Ca of N. pachyderma (s), on the other hand, is low (1.1-1.5 mmol/mol) and shows only a very weak seasonal cycle. The delta O-18 patterns indicate that both species calcify in the same depth zone. Consequently, depth habitat differences cannot explain the contrasting Mg/Ca patterns. The elevated Mg/Ca in pristine G. bulloides might be due to the presence of high Mg phases that are not preserved in fossil shells. The contrasting absence of a seasonal trend in the Mg/Ca of N. pachyderma (s) confirms other studies where calcification temperatures were less well constrained. The reason for this absence is not fully known, but may include species-specific vital effects. The very different seasonal patterns of both species' Mg/Ca underscore the importance of parameters other than temperature in controlling planktonic foraminiferal Mg/Ca. Our results therefore lend further caution in the interpretation of Mg/Ca-temperature reconstructions from high northern latitudes.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Seasonal Mg/Ca variability of <i>N. pachyderma</i> (s) and <i>G. bulloides</i>: Implications for seawater temperature reconstruction","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":"Mg/Ca-temperature proxy; stable oxygen isotopes; planktonicforaminifera; sediment trap; North Atlantic","OtherDescriptors":null,"Notes":null,"AnaPub":2013,"MonPub":null,"DateUpdate":"2014-06-27","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000324967900013","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.epsl.2013.06.019"},"refs":null,"anarec":{"AnaID":230793,"PubliDate":2013,"Pagination":"137-144","XtraPublOfAnaID":null,"ISBN":null,"Volume":"376","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42615,"SerRR":"Earth and Planetary Science Letters. Elsevier: Amsterdam.  ISSN 0012-821X; e-ISSN 1385-013X","StandardTitleSer":"Earth and Planetary Science Letters","ISSN":"0012-821X","AbbrevSer":"Earth Planet. Sci. 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