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dc.contributor.authorRichey, Julie N.  Concept link
dc.contributor.authorTierney, Jessica E.  Concept link
dc.date.accessioned2017-03-20T19:26:08Z
dc.date.issued2016-12-19
dc.identifier.citationPaleoceanography 31 (2016): 1547–1561en_US
dc.identifier.urihttps://hdl.handle.net/1912/8811
dc.descriptionAuthor Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 31 (2016): 1547–1561, doi:10.1002/2016PA003032.en_US
dc.description.abstractThe TEX86 and UKˈ37 molecular biomarker proxies have been broadly applied in downcore marine sediments to reconstruct past sea surface temperature (SST). Although both TEX86 and UKˈ37 have been interpreted as proxies for mean annual SST throughout the global ocean, regional studies of glycerol dibiphytanyl glycerol tetraethers (GDGTs) and alkenones in sinking particles are required to understand the influence of seasonality, depth distribution, and diagenesis on downcore variability. We measure GDGT and alkenone flux, as well as the TEX86 and UKˈ 37 indices in a 4 year sediment trap time series (2010–2014) in the northern Gulf of Mexico (nGoM), and compare these data with core-top sediments at the same location. GDGT and alkenone fluxes do not show a consistent seasonal cycle; however, the largest flux peaks for both occurs in winter. UKˈ 37 covaries with SST over the 4 year sampling interval, but the UKˈ 37-SST relationship in this data set implies a smaller slope or nonlinearity at high temperatures when compared with existing calibrations. Furthermore, the flux-weightedUKˈ 37 value from sinking particles is significantly lower than that of underlying core-top sediments, suggesting preferential diagenetic loss of the tri-unsaturated alkenone in sediments. TEX86 does not covary with SST, suggesting production in the subsurface upper water column. The flux-weighted mean TEX86 matches that of core-top sediments, confirming that TEX86 in the nGoM reflects local planktonic production rather than allochthonous or in situ sedimentary production. We explore potential sources of uncertainty in both proxies in the nGoM but demonstrate that they show nearly identical trends in twentieth century SST, despite these factors.en_US
dc.description.sponsorshipUSGS Climate and Land Use Research and Development Programen_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2016PA003032
dc.subjectTEX86en_US
dc.subjectUKˈ37en_US
dc.subjectAlkenoneen_US
dc.subjectGDGTen_US
dc.subjectSediment trapen_US
dc.subjectGulf of Mexicoen_US
dc.subjectBiomarkersen_US
dc.titleGDGT and alkenone flux in the northern Gulf of Mexico : implications for the TEX86 and UK'37 paleothermometersen_US
dc.typeArticleen_US
dc.description.embargo2017-06-19en_US
dc.identifier.doi10.1002/2016PA003032
dc.embargo.liftdate2017-06-19


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