Coral Ba/Ca and Mn/Ca ratios as proxies of precipitation and terrestrial input at the eastern offshore area of Hainan Island
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Geochemical ratios in coral reef skeletons could be used as proxies to reconstruct past climatological and environmental records in data-poor regions. Using a 103-year data set (1902 to 2005), the annual variations in Ba/Ca and Mn/Ca ratios of Porites lutea skeletons at an eastern offshore area of Hainan Island (19°12´28.4´´N, 110°37´38.8´´E) were analyzed using inductively coupled plasma-optic emission spectrometry (ICP-OES). The analysis results showed that Ba/Ca ratios varied from a minimum of 3.120 μmol mol−1 in 1903 to a maximum of 10.064 μmol mol−1 in 1944, with an average of 5.256 μmol mol−1. Mn/Ca ratios varied from 0.206 to 5.708 μmol mol−1 with an annual average of 1.234 μmol mol−1, with peak values in 2001, 1964 and 1932, that correlated with strong rainfall events caused by typhoons. Variation in Ba/Ca and Mn/Ca ratios were compared with available river discharge and precipitation records, providing insight into past climatological events. Human activities and their indirect effects could impact the strength of the relationship between Ba/Ca and Mn/Ca ratios and observed precipitation and terrestrial input in the future.
Key wordsPorites lutea eastern offshore area of Hainan Island Ba/Ca and Mn/Ca ratios terrigenous input precipitation climate proxy records
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We thank Gangjian Wei and Ying Liu of Guangzhou Institute of Geochemistry, Chinese Academy of Sciences for guidance and help of sample pretreatment and instrumental analysis. This work was supported by the National Ocean Welfare Research Funds of State Ocean Administration (No. 201105012).
- Chen, J. M., Zhou, Y. T., Liu, Y., Liu, G. J., Peng, Z. C., Nie, B. F., and Chen, T. G., 2005. Annual variability of heavy metal contents in the Porites lutea coral from the Longwan Bay. Marine Geology & Quaternary Geology, 25 (1): 11–18 (in Chinese with English abstract).Google Scholar
- Chen, M. H., Gao, S., Zou, X. Q., and Zhu, D. K., 2002. Preliminary study on seabed mobility during low river discharge periods, Boao Harbour, Hainan Island. Marine Science Bulletin, 21 (6): 39–46 (in Chinese with English abstract).Google Scholar
- Chen, X. F., Wei, G. J., Deng, W. F., Liu, Y., Sun, Y. L., Zheng, T., and Xie, L. H., 2015. Decadal variations in concentrations on a coral reef: Evidence from a 159 year record of Mn, Cu, and V in a Porites coral from the northern South Sea. Journal of Geophysical Research: Oceans, 120 (1): 405–416.Google Scholar
- Gao, J. H., Gao, S., Chen, P., Ge, C. D., and Zhu, D. K., 2002. Longshore sediment transport along the coast of Boao Harbour, Hainan Island. Marine Geology & Quaternary Geology, 22 (2): 41–48 (in Chinese with English abstract).Google Scholar
- Jiang, Q. W., Cao, Z. M., Wang, D. R., Li, Y. C., and Ni, J. Y., 2016. Growth characteristics of Porites lutea skelton in east sea area of Hainan Island, China and main affecting environmental factors. Chinese Journal of Applied Ecology, 27 (3): 953–962 (in Chinese with English abstract).Google Scholar
- Liu, Y., Peng, Z. C., Cheng, J. M., Sun, T., Nie, B. F., and Chen, T. G., 2006. The relationship between Sr/Ca values of Porites coral and SST values in Eastern Hainan Island at the north of South China Sea and its influence factors. Quaternary Sciences, 26 (3): 470–476 (in Chinese with English abstract).Google Scholar
- Montagna, P., McCulloch, M., Taviani, M., Remia, A., and Rouse, G., 2005. High-resolution trace and minor element compositions in deep-water scleractinian corals (Desmophyllum dianthus) from the Mediterranean Sea and the Great Australian Bight. Cold-Water Corals and Ecosystems, Springer Berlin Heidelberg, 1109–1126.Google Scholar
- Moyer, R. P., Grottoli, A. G., and Olesik, J. W., 2012. A multiproxy record of terrestrial inputs to the coastal ocean using minor and trace elements (Ba/Ca, Mn/Ca, Y/Ca) and carbon isotopes (δ 13C, Δ 14C) in a nearshore coral from Puerto Rico. Paleoceanography, 27 (27): 437–444.Google Scholar
- Su, R. X., and Sun, D. H., 2003. The influencing factors of coral Porites in the northern part of the South China Sea. Acta Geographica Sinica, 58 (3): 442–451 (in Chinese with English abstract).Google Scholar
- Wei, G. J., Li, X. H., Sun, M., and Nie, B. F., 2000. Seasonal ventilation of the Ba/Ca of the Porites corals from northern South China Sea: Patterns and their environmental implication. Geochimica, 29 (1): 67–72 (in Chinese with English abstract).Google Scholar
- Wei, G. J., Yu, K. F., Li, X. H., Zhao, J. X., Sun, Y. L., Sun, M., and Nie, B. F., 2004. Coralline Sr/Ca and Mg/Ca thermometer for the Northern South China Sea: Calibration and primary application on high-resolution SST reconstructing. Quaternary Sciences, 24 (3): 325–331 (in Chinese with English abstract).Google Scholar
- Yu, K. F., Chen, T. G., Lian, J. S., Wang, Z. D., and Liu, T. S., 2002. Annual changes of heavy metals in coral platygyra in Daya Bay and their marine environment implication. Quaternary Sciences, 22 (3): 230–235 (in Chinese with English abstract).Google Scholar
- Yu, K. F., Zhao, J. X., Wei, G. J., Cheng, X. R., Chen, T. G., Felis, T., Wang, P. X., and Liu, T. S., 2005. δ 18O, Sr/Ca and Mg/Ca records of Porites lutea corals from Leizhou Peninsula, northern South China Sea, and their applicability as paleoclimatic indicators. Palaeogeography Palaeoclimatology Palaeoecology, 218 (s1-2): 57–73.CrossRefGoogle Scholar
- Zhang, J. Y., Yu, K. F., Cheng, X. R., and Shi, Q., 2007. Preliminary results of characteristics of density bands of Porites coral from Meiji Reef in Nansha area. Marine Geology & Quaternary Geology, 27 (4): 85–90 (in Chinese with English abstract).Google Scholar