DOI: 10.1016/j.palaeo.2012.06.017
论文题名: Skeletal microstructure and stable isotope signature of three bathyal solitary cold-water corals from the Azores
作者: Marali S. ; Wisshak M. ; López Correa M. ; Freiwald A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 373 起始页码: 25
结束页码: 38
语种: 英语
英文关键词: Caryophyllia
; Desmophyllum
; Lines technique
; Stenocyathus
; Temperature reconstruction
英文摘要: Skeletons of cold-water corals are potential geochemical archives that record oceanographic parameters, such as bottom water temperature in the deep sea. In this study, the three solitary scleractinian species, Caryophyllia cyathus, Desmophyllum cristagalli and Stenocyathus vermiformis, were sampled from upper bathyal 500m water depths in the southern Faial Channel (Azores archipelago). The stable carbon isotope (δ13C) and oxygen isotope (δ18O) compositions of the corals were analysed and related to their skeletal architecture. Background data, including data from high-resolution temperature logs and on the ambient seawater isotopic composition, were compared with δ18O-based temperature reconstructions to test the suitability of these cold-water corals as geochemical archives and to explore the role of vital effects on skeletal geochemistry. Although all of the corals experienced identical and near-stable salinities and temperatures, the stable isotopic signatures vary within and among species. Both δ13C and δ18O values fluctuate in relation to growth bandings and are therefore most likely dependent on calcification rates and associated kinetic vital effects. The studied specimens are 13C depleted with respect to equilibrium with ambient seawater, indicating significant uptake of respired CO2 by their skeletons. Skeletal δ18O values vary by up to 3.6‰ among the growth bands of one of the coral specimens, translating into an unrealistic reconstructed temperature amplitude of ~16°C. This contrasts with the minute intra-annual amplitude of the stable temperature regime (annual mean 12.30±0.25°C). Nevertheless, δ13C vs. δ18O regression lines can be used to deduce ambient temperatures by applying the lines technique (Smith et al., 2000; Palaios 15, 25-32), which yields temperatures that coincide with the measured maximum temperature range in the case of D. cristagalli and for most C. cyathus samples, but deviate by 2.95°C from the measured annual mean in the case of the S. vermiformis specimen. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69825
Appears in Collections: 过去全球变化的重建
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作者单位: Senckenberg am Meer, Marine Research Department, Südstrand 40, D-26382 Wilhelmshaven, Germany; GeoZentrum Nordbayern, University of Erlangen-Nürnberg, Loewenichstr. 28, D-91054 Erlangen, Germany; MARUM, Center for Marine Environmental Sciences, University of Bremen, Leobener Str., D-28359 Bremen, Germany
Recommended Citation:
Marali S.,Wisshak M.,López Correa M.,et al. Skeletal microstructure and stable isotope signature of three bathyal solitary cold-water corals from the Azores[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,373