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| CORALS AND SCLEROSPONGES | ||||||||||
Pirotan Island - Stable Isotope Data |
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Chakraborty, S., and R. Ramesh. 1998. Stable isotope variations in a coral (Favia speciosa) from the Gulf of Kutch during 1948-1989 AD: Environmental implications. Proceedings of the Indian Academy of Science (Earth and Planetary Sciences) 107(4):331-341.
Start Year: 1948 AD End Year: 1989 AD Data: Please Cite Data Contributors! indian_ocean/pirotan1998.txt |
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Summary:The stable isotopic analyses (d18O and d13C) of a coral Favia speciosa spanning forty two years (1948-1989), collected from the Pirotan island (22.6 N, 70E) in the Gulf of Kutch have been carried out to assess its potential for retrieving past environmental changes in this region. It is seen that the summer (minima) d18O variations in the coral CaCO3 are negatively correlated with seasonal (summer) monsoon rainfall in the adjoining region of Kutch and Saurashtra and a qualitative reconstruction of historical rainfall variations in this region can be obtained by analyzing the d18O in this species of coral. The observed mean seasonal range of d18O variations is 0.34 +/- 0.17 per mil (n=42), whereas the expected range calculated (from available SST and measured d18O of sea water) is ~1.1 +/- 0.15 per mil. The difference is due to the coarse resolution of sampling, which can be corrected. The seasonal range in d13C is ~1 per mil and is explained by changes in: a) the light intensity related to the cloudiness during monsoons and b) phytoplankton productivity.More Info on Corals and Sclerosponges |
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Parameters:del13C; del18O |
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Complete XML Record:noaa-coral-1901 (Last Revised: 2008-06-19 ) |
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