DOI: 10.1016/j.palaeo.2017.02.007
论文题名: Conus Shell δ13C values as proxies for δ13CDIC in tropical waters
作者: Graniero L.E. ; Grossman E.L. ; Robbins J. ; Morales J. ; Thompson R. ; O'Dea A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 472 起始页码: 119
结束页码: 127
语种: 英语
英文关键词: Dissolved inorganic carbon
; Gastropod
; Isotopes
; Mollusk
; Seasonality
; Upwelling
英文摘要: We use time-series δ18O and δ13C data from seawater and live-collected Conus shells from Panama's Pacific coast to test the fidelity of the gastropod's δ13C values as a proxy for the δ13C of marine dissolved inorganic carbon (DIC), and the potential of δ18O-δ13C correlations in shell profiles for resolving relative magnitudes of seasonal upwelling and freshening. Water samples were collected from March 2011 to August 2012 from Naos Island Marine Laboratory, and Conus specimens were collected from nearby Veracruz Beach in July 2013. In general, patterns corresponded with seasonal changes in rainfall and upwelling on the Pacific coast of Panama. During the long rainy season, the upwelling signal is absent and seawater salinity, δ18O, and δ13CDIC all decline. During the dry season, the upwelling signal increases and runoff declines increasing salinity, δ18O, and δ13CDIC values. Shell δ13C values strongly correlate with measured δ13CDIC values, but are lower than expected equilibrium for aragonite by approximately + 2‰ reflecting the incorporation of light metabolic C. The co-dependences of δ18O and δ13C provide reliable indicators of upwelling (negative correlation) and freshening (positive correlation) for nearshore environments, allowing for the study of historical climate change and upwelling based on beach-collected museum specimens. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67878
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; Smithsonian Tropical Research Institute, P.O. Box 0843-03092, Balboa, Panama
Recommended Citation:
Graniero L.E.,Grossman E.L.,Robbins J.,et al. Conus Shell δ13C values as proxies for δ13CDIC in tropical waters[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,472