Pirotan Island - Stable Isotope Data Chakraborty, S.; Ramesh, R. Chakraborty, S. Ramesh, R. earth science/paleoclimate/corals and sclerosponges (age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (delta 13C,Dipsastraea speciosa,null,per mil VPDB,null,corals and sclerosponges,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (delta 18O,Dipsastraea speciosa,null,per mil VPDB,null,corals and sclerosponges,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges earth science/paleoclimate/corals and sclerosponges (Pirotan Island>LATITUDE 22.6>LONGITUDE 70) The stable isotopic analyses (d18O and d13C) of a coral Favia speciosaspanning 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 reconstructionof 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 seawater) is ~1.1 +/- 0.15 per mil. The difference is due to the coarse resolution of sampling, which can be corrected. The seasonal range ind13C is ~1 per mil and is explained by changes in: a) the light intensityrelated to the cloudiness during monsoons and b) phytoplankton productivity. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Chakraborty, S. Investigator : Ramesh, R. 1998-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/1901 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/pirotan1998.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/pirotan1998.txt English https://www.ncdc.noaa.gov/paleo/study/1901 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/pirotan1998.txt 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 70 22.6 70 22.6