Per citar aquest document: http://ddd.uab.cat/record/25432
A study of the TEX86 paleothermometer in the water column and sediments of the Santa Barbara Basin, California
Huguet, Carme (Huguet Micheo) (Royal Netherlands Institute for Sea Research. Department of Marine Biogeochemistry and Toxicology)
Schimmelmann, Arndt (Indiana University. Department of Geological Sciences)
Thunell, Robert (University of South Carolina. Department of Geological Sciences)
Lourens, Lucas J. (University Utrecht. Department of Earth Sciences)
Sinninghe Damsté, Jaap S. (Royal Netherlands Institute for Sea Research. Department of Marine Biogeochemistry and Toxicology)
Schouten, Stefan (Royal Netherlands Institute for Sea Research. Department of Marine Biogeochemistry and Toxicology)

Data: 2007
Resum: Particulate organic matter collected during a 2-year period, as part of an ongoing sediment trap study, and a high-resolution sediment record from 1850 to 1987 A. D. from the Santa Barbara Basin were analyzed for TEX86, a temperature proxy based on marine crenarchaeotal membrane lipids. Highest fluxes of crenarchaeotal lipids in the water column were found in May–June 1996 and from October 1996 to January 1997 and, in general, showed a good correlation with mass fluxes. TEX86 reconstructed temperatures from the sediment trap series ranged from 8 to 11°C and were usually substantially lower than sea surface temperatures (SST), indicating that unlike in previous studies, the TEX86 corresponds to subsurface temperatures, likely between 100 and 150 m. TEX86 temperature variations observed in trap samples were not coupled to changes in SST or deep-water temperatures and only to some degree with crenarchaeotal lipid fluxes. This suggests that a complex combination of different depth origins and seasonal growth periods of Crenarchaeota contributed to the variations in TEX86 signal during the annual cycle. TEX86 temperatures in the two sediment cores studied (8–13°C) were also substantially lower than those of instrumental SST records (14–17. 5°C) confirming that TEX86 records a subsurface temperature signal in the Santa Barbara Basin. This result highlights the importance of performing calibration studies using sediment traps and core tops before applying the TEX86 temperature proxy in a given study area.
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; publishedVersion
Matèria: Santa Barbara Basin ; paleoclimatology ; marine organic chemistry ; geochemical tracers ; sea surface temperature
Publicat a: Paleoceanography, Vol. 22, Issue 3 (September 2007) , p.PA3203, ISSN 0883-8305

Adreça alternativa: http://dx.doi.org/10.1029/2006PA001310
DOI: 10.1029/2006PA001310


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