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Title: Temperature and vital effect controls on Bamboo coral (Isididae) isotopegeochemistry: A test of the "lines method"

Abstract

Deep-sea bamboo corals hold promise as long-term climatic archives, yet little information exists linking bamboo coral geochemistry to measured environmental parameters. This study focuses on a suite of 10 bamboo corals collected from the Pacific and Atlantic basins (250-2136 m water depth) to investigate coral longevity, growth rates, and isotopic signatures. Calcite samples for stable isotopes and radiocarbon were collected from the base the corals, where the entire history of growth is recorded. In three of the coral specimens, samples were also taken from an upper branch for comparison. Radiocarbon and growth band width analyses indicate that the skeletal calcite precipitates from ambient dissolved inorganic carbon and that the corals live for 150-300 years, with extension rates of 9-128 {micro}m/yr. A linear relationship between coral calcite {delta}{sup 18}O and {delta}{sup 13}C indicates that the isotopic composition is influenced by vital effects ({delta}{sup 18}O:{delta}{sup 13}C slope of 0.17-0.47). As with scleractinian deep-sea corals, the intercept from a linear regression of {delta}{sup 18}O versus {delta}{sup 13}C is a function of temperature, such that a reliable paleotemperature proxy can be obtained, using the 'lines method.' Although the coral calcite {delta}{sup 18}O:{delta}{sup 13}C slope is maintained throughout the coral base ontogeny, the branches andmore » central cores of the bases exhibit {delta}{sup 18}O:{delta}{sup 13}C values that are shifted far from equilibrium. We find that a reliable intercept value can be derived from the {delta}{sup 18}O:{delta}{sup 13}C regression of multiple samples distributed throughout one specimen or from multiple samples within individual growth bands.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1021065
Report Number(s):
LLNL-JRNL-471625
TRN: US201116%%982
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Geochemistry, Geophysics, Geosystems, vol. 12, Q04008, April 26, 2011, doi:10.1029/2010GC003443
Additional Journal Information:
Journal Volume: 12
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; BAMBOO; CALCITE; CARBON; CORALS; GEOCHEMISTRY; PALEOTEMPERATURE; STABLE ISOTOPES; WATER

Citation Formats

Hill, T M, Spero, H J, Guilderson, T P, LaVigne, M, Clague, D, Macalello, S, and Jang, N. Temperature and vital effect controls on Bamboo coral (Isididae) isotopegeochemistry: A test of the "lines method". United States: N. p., 2011. Web.
Hill, T M, Spero, H J, Guilderson, T P, LaVigne, M, Clague, D, Macalello, S, & Jang, N. Temperature and vital effect controls on Bamboo coral (Isididae) isotopegeochemistry: A test of the "lines method". United States.
Hill, T M, Spero, H J, Guilderson, T P, LaVigne, M, Clague, D, Macalello, S, and Jang, N. 2011. "Temperature and vital effect controls on Bamboo coral (Isididae) isotopegeochemistry: A test of the "lines method"". United States. https://www.osti.gov/servlets/purl/1021065.
@article{osti_1021065,
title = {Temperature and vital effect controls on Bamboo coral (Isididae) isotopegeochemistry: A test of the "lines method"},
author = {Hill, T M and Spero, H J and Guilderson, T P and LaVigne, M and Clague, D and Macalello, S and Jang, N},
abstractNote = {Deep-sea bamboo corals hold promise as long-term climatic archives, yet little information exists linking bamboo coral geochemistry to measured environmental parameters. This study focuses on a suite of 10 bamboo corals collected from the Pacific and Atlantic basins (250-2136 m water depth) to investigate coral longevity, growth rates, and isotopic signatures. Calcite samples for stable isotopes and radiocarbon were collected from the base the corals, where the entire history of growth is recorded. In three of the coral specimens, samples were also taken from an upper branch for comparison. Radiocarbon and growth band width analyses indicate that the skeletal calcite precipitates from ambient dissolved inorganic carbon and that the corals live for 150-300 years, with extension rates of 9-128 {micro}m/yr. A linear relationship between coral calcite {delta}{sup 18}O and {delta}{sup 13}C indicates that the isotopic composition is influenced by vital effects ({delta}{sup 18}O:{delta}{sup 13}C slope of 0.17-0.47). As with scleractinian deep-sea corals, the intercept from a linear regression of {delta}{sup 18}O versus {delta}{sup 13}C is a function of temperature, such that a reliable paleotemperature proxy can be obtained, using the 'lines method.' Although the coral calcite {delta}{sup 18}O:{delta}{sup 13}C slope is maintained throughout the coral base ontogeny, the branches and central cores of the bases exhibit {delta}{sup 18}O:{delta}{sup 13}C values that are shifted far from equilibrium. We find that a reliable intercept value can be derived from the {delta}{sup 18}O:{delta}{sup 13}C regression of multiple samples distributed throughout one specimen or from multiple samples within individual growth bands.},
doi = {},
url = {https://www.osti.gov/biblio/1021065}, journal = {Geochemistry, Geophysics, Geosystems, vol. 12, Q04008, April 26, 2011, doi:10.1029/2010GC003443},
number = ,
volume = 12,
place = {United States},
year = {Tue Mar 01 00:00:00 EST 2011},
month = {Tue Mar 01 00:00:00 EST 2011}
}