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Interhemispheric appraisal of the value of alkenone indices as temperature and salinity proxies in high-latitude locations
Rosell Melé, Antoni (University of Newcastle. Department of Fossil Fuels and Environmental Geochemistry)

Data: 1998
Resum: Alkenone sediment data from the Nordic seas and North Atlantic are compared to those from Sikes et al. [1997] for the Southern Ocean to evaluate further UK37 and UK37' as proxies to estimate cold temperatures (<10°C) and the effect of salinity and temperature in the relative abundance of 37∶4 to the total abundance of C37 alkenones (37∶4%). UK37 and UK37' are found to be equally viable as proxies, but there are significant regional differences in their cold temperature dependence. The measurement of 37∶4% in cores from the North Atlantic region can be used to identify situations when UK37' is not a reliable paleothermometer. Variations in salinity are probably responsible for changes in the sedimentary record of 37∶4%, and a preliminary calibration has been obtained for 37:4%=f(salinity). This new relationship should be further confirmed through field or laboratory experiments, but it paves the way to derive a molecular proxy to reconstruct paleosalinity in surface waters.
Drets: Tots els drets reservats.
Llengua: Anglès
Document: Article ; Versió publicada
Matèria: Paleoceanography
Publicat a: Paleoceanography, Vol. 13, Issue 6 (1998) , p. 694-703, ISSN 1944-9186

DOI: 10.1029/98PA02355

10 p, 1.2 MB

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