TY - JOUR
T1 - Radiocarbon and stable isotopes in Palmyra corals during the past century
AU - Druffel-Rodriguez, Kevin C.
AU - Vetter, Desiree
AU - Griffin, Sheila
AU - Druffel, Ellen R M
AU - Dunbar, Robert B.
AU - Mucciarone, David A.
AU - Ziolkowski, Lori A.
AU - Sanchez-Cabeza, Joan Albert
PY - 2012/4/1
Y1 - 2012/4/1
N2 - Annual samples from two Palmyra Atoll corals (Porites lutea) that lived during the past 110years were analyzed for radiocarbon (Δ 14C) and δ 18O. The Δ 14C values decreased 7.6‰ from 1896 to 1953, similar to other coral records from the tropical and subtropical Pacific. Δ 14C values rose from ~-60‰ to ~+110‰ by 1980 due to the input of bomb radiocarbon from the atmosphere. Elevated Δ 14C values were observed for the mid- to late-1950s, suggesting early input of bomb radiocarbon, possibly from the largest Marshall Islands bomb tests in 1954. Secondary aragonite precipitation was identified in a portion of one core using scanning electron microscopy and X-radiography, and was responsible for high δ 18O and δ 13C values and a correlation between them. The Δ 14C results were more resistant to alteration, except when contamination was from the bomb era (>1956). © 2011 Elsevier Ltd.
AB - Annual samples from two Palmyra Atoll corals (Porites lutea) that lived during the past 110years were analyzed for radiocarbon (Δ 14C) and δ 18O. The Δ 14C values decreased 7.6‰ from 1896 to 1953, similar to other coral records from the tropical and subtropical Pacific. Δ 14C values rose from ~-60‰ to ~+110‰ by 1980 due to the input of bomb radiocarbon from the atmosphere. Elevated Δ 14C values were observed for the mid- to late-1950s, suggesting early input of bomb radiocarbon, possibly from the largest Marshall Islands bomb tests in 1954. Secondary aragonite precipitation was identified in a portion of one core using scanning electron microscopy and X-radiography, and was responsible for high δ 18O and δ 13C values and a correlation between them. The Δ 14C results were more resistant to alteration, except when contamination was from the bomb era (>1956). © 2011 Elsevier Ltd.
UR - https://www.scopus.com/pages/publications/84857660350
U2 - 10.1016/j.gca.2010.11.028
DO - 10.1016/j.gca.2010.11.028
M3 - Article
SN - 0016-7037
VL - 82
SP - 154
EP - 162
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
ER -