Calibration and application of the &apos;clumped isotope&apos; thermometer to   foraminifera for high-resolution climate reconstructions

doi:10.1016/j.gca.2012.12.049

CORC > 北京大学 > 地球与空间科学学院

	Calibration and application of the 'clumped isotope' thermometer to foraminifera for high-resolution climate reconstructions
	Grauel, Anna-Lena ; Schmid, Thomas W. ; Hu, Bin ; Bergami, Caterina ; Capotondi, Lucilla ; Zhou, Liping ; Bernasconi, Stefano M.
刊名	geochimica et cosmochimica acta
	2013
关键词	LAST GLACIAL MAXIMUM MULTIPLY-SUBSTITUTED ISOTOPOLOGUES PLANKTONIC-FORAMINIFERA PLEISTOCENE TEMPERATURES CARBONATE MINERALS MEDITERRANEAN SEA C-13-O-18 BONDS SURFACE WATERS ADRIATIC SEA OXYGEN
DOI	10.1016/j.gca.2012.12.049
英文摘要	The reconstruction of past ocean temperatures is fundamental to the study of past climate changes, therefore considerable effort has been invested in developing proxies for seawater temperatures. One of the most recent and promising new proxy is carbonate 'clumped isotope' thermometry, in particular because it is based on thermodynamic equilibrium and not on biogeochemical proxies. Here, we present a new calibration of the 'clumped isotope' thermometer to foraminifera based on seven species of planktic and benthic foraminifera spanning a growth temperature range of similar to 2-28 degrees C. We used a newly developed technique for the measurements of small samples to improve the applicability of this method to paleoceanography. Our data have a comparable precision (similar to 0.005-0.013 parts per thousand) and confirm previous calibration studies based on biogenic and inorganic calcite. We discuss possible sources of uncertainty such as over-/underestimation of the calcification temperatures, species-specific vital effects, pH variations between the seawater and the vacuole water of the species and possible kinetic effects on the 'clumped isotope' calibration. To validate our calibration study and test the applicability of our measuring technique to paleoclimate and paleoceanographic studies we measured the isotope composition of Globigerinoides ruber (white) at high-resolution in a sediment core covering the last 700 years in the Gulf of Taranto (Mediterranean Sea). The results show that it is necessary to average a relatively large number of analyses to achieve a consistent temperature signal for the detection of small sea surface temperature changes. Although with the current analytical system, 'clumped isotope' thermometry is only applicable to the analysis of relatively large SST changes in marine sediments, further technical improvements may make this a very powerful technique for paleoceanographic studies. (C) 2013 Elsevier Ltd. All rights reserved.; Geochemistry & Geophysics; SCI(E); 16; ARTICLE; 125-140; 108
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/224321]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Grauel, Anna-Lena,Schmid, Thomas W.,Hu, Bin,et al. Calibration and application of the 'clumped isotope' thermometer to foraminifera for high-resolution climate reconstructions[J]. geochimica et cosmochimica acta,2013.
APA	Grauel, Anna-Lena.,Schmid, Thomas W..,Hu, Bin.,Bergami, Caterina.,Capotondi, Lucilla.,...&Bernasconi, Stefano M..(2013).Calibration and application of the 'clumped isotope' thermometer to foraminifera for high-resolution climate reconstructions.geochimica et cosmochimica acta.
MLA	Grauel, Anna-Lena,et al."Calibration and application of the 'clumped isotope' thermometer to foraminifera for high-resolution climate reconstructions".geochimica et cosmochimica acta (2013).