A model-based test of accuracy of seawater oxygen isotope ratio record derived from a coral dual proxy method at southeastern Luzon Island, the Philippines

The oxygen isotope ratio in seawater (δ18Osw) is an important indicator of past hydroclimatic conditions in the tropics. In this study, we apply a dual proxy approach using δ18O and Sr/Ca in coral skeletons to estimate δ18Osw. Due to a lack of long‐term continuous observational data for δ18Osw, a si...

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Bibliographic Details
Published in:Journal of geophysical research. Biogeosciences 2013-06, Vol.118 (2), p.853-859
Main Authors: Liu, Gang, Kojima, Keitaro, Yoshimura, Kei, Okai, Takashi, Suzuki, Atsushi, Oki, Taikan, Siringan, Fernando P., Yoneda, Minoru, Kawahata, Hodaka
Format: Article
Language:English
Subjects:
Accuracy
Atmospherics
coral
Corals
Dry season
Estimates
Evaporation
Hydrologic cycle
hydrological proxy
Indicators
Isotopes
Oxygen isotope ratio
Oxygen isotopes
Proxy client servers
Rainy season
Reproduction
Sea water
Seasonal variations
Seasons
Seawater
Tropical environments
Upwelling
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Summary:The oxygen isotope ratio in seawater (δ18Osw) is an important indicator of past hydroclimatic conditions in the tropics. In this study, we apply a dual proxy approach using δ18O and Sr/Ca in coral skeletons to estimate δ18Osw. Due to a lack of long‐term continuous observational data for δ18Osw, a simplified one‐dimensional box model of the ocean surface associated with historical surface atmospheric data is used for comparison with coral‐derived δ18Osw record. The atmospheric data consist of the precipitation and evaporation values, together with their δ18O compositions from the global isotope reanalysis data. The model successfully reproduces a multidecadal time series for δ18Osw at southeastern Luzon Island, the Philippines, for the period 1979–2001 (r = 0.57, p 
ISSN:2169-8953
2169-8961
DOI:10.1002/jgrg.20074