Keywords
coral
Porites
solar radiation
cloud cover
SST
How to Cite
Abstract
Variation of δ13C content in coral skeletons shows the influence of metabolic fractionation in aragonite coral. Understanding coral δ13C variation can thus be useful to more understand e.g. past bleaching event which is further useful for coral health and conservation. In this study, δ13C content in Porites coral from Labuhan Bajau, Simeulue Islands was analyzed. To know the correlation between variation of coral δ13C and light intensity, the monthly variation of coral δ13C is compared to solar radiation and cloud cover. The result shows that for the period of 2003 to 2008, coral δ13C shows it is well correlated (r=0.42 p=0.153) with cloud cover variation in annual mean scale. Meanwhile, in seasonal mean variation, coral δ13C is strongly influenced (r=0.85 p<0.0001) by cloud cover with 1 - 2 month time lag. Comparing to the solar radiation (cloud cover), SST influences dominantly the variation of coral δ13C from southern Simeulue Island waters (LB sample) in an annual mean scale than in a seasonal scale.
References
Cahyarini, S.Y., 2011. Rekonstruksi suhu permukaan laut periode 1993-2007 berdasarkan analisis kandungan Sr/Ca koral dari wilayah Labuan Bajo, Pulau Simeulue. Jurnal Geologi Indonesia, 6 (3), p.129-134. (DOI: 10.17014/ijog.v6i3.121)
Felis, T., Patzold, J., Loya, Y., and Wefer, G., 1998. Vertical water mass mixing and plankton blooms recorded in skeletal stable carbon isotopes of a Red Sea coral. Journal of Geophysical Research,103 (30), p.730-731. (DOI: 10.1029/98JC02711)
Grottoli, A.G. and Wellington, G.M., 1999. Effect of life and zooplankton on skeletal d13C values in the eastern Pacific corals Pavona clavus and Pavona gigantean. Coral Reefs,18, p.29-41. (DOI: 10.1007/s003380050150)
Grottoli, A.G., 2002. Effect of life and bring shrimp on skeletal d13C in the Hawaiian coral Porites compressa: a tank experiment. Geochimica et Cosmochimica Acta, 66, p.1955-1967. (DOI: 10.1016/S0016-7037(01)00901-2)
Heikoop, J.M., Hickmott, D.D., Risk, M.J., Shearer,C.K., and Atudorei,V., 2002. Potential climate signals from the deep sea gorgonian coral Primnoa resedaeformis. Hydrobiologia, 471, p.117-124. (DOI: 10.1023/A:1016505421115)
McConnaughey, T., 1989. 13C and 18O isotopic disequilibrium in biological carbonates: II In Vitro simulation of kinetic isotope effect. Geochimica et Cosmochimica Acta, 53, p.163-171. (DOI: 10.1016/0016-7037(89)90283-4)
Porter J.W., Fitt, W.K., Spero, H.J., Rogers, C.S., and White, M.W., 1989. Bleaching in reef corals: physiological and stable isotopic responses. Proceedings of Natural Academic Science,USA, 86, p.9342-9346.
Rodrigues, L.J. and Grottoli, A.G., 2006. Calcification rate and the stable carbon, oxygen, and nitrogen isotopes in the skeleton, host tissue, and zooxanthellae of bleached and recovering Hawaiian corals. Geochimica et Cosmochi- mica Acta, 70, p.2781-2789, (doi 10.1016/j. gca.2006.02.014)
Wang, P., Stammes, R. van der A.P., Pinardi, G., and Roozendael, M. van, 2008. FRESCO+: an improved O2 A-band cloud retrieval algorithm for tropospheric trace gas retriev- als. Atmospheric Chemistry and Physics, 8, p.6565-6576. (DOI: 10.5194/acp-8-6565-2008)