Radiocarbon Data from Indian Tree-Rings and Corals Chakraborty, S.; Ramesh, R.; Krishnaswami, S. Chakraborty, S. Ramesh, R. Krishnaswami, S. earth science/paleoclimate/others (Gulf of Kutch>LATITUDE 22.6>LONGITUDE 70) (Thane>LATITUDE 19.233>LONGITUDE 73.4) Radiocarbon analyses were carried out in the annual bands of a 40 year old coral collected from the Gulf of Kutch (22.6N, 70E) in the northern Arabian Sea and in the annual rings of a teak tree from Thane (19 14'N, 73 24'E) near Bombay. These measurements were made in order to obtain the rates of air-sea exchange of CO2 and the advective mixing of water in the Gulf of Kutch. The D14C peak in the Thane tree occurs in the year 1964, with a value of -630 permil, significantly lower than that of the mean atmospheric D14C of the northern hemisphere (~ 1000 permil). The radiocarbon time series of the coral was modelled considering the supply of carbon and radiocarbon to the gulf through air-sea exchange and advective water transport from the open Arabian Sea. A reasonable fit for the coral data was obtained with an air-sea CO2 exchange rate of 11-12 mol m-2 yr-1, and an advective velocity of 28 m yr-1 between the Arabian Sea and the Gulf of Kutch; this was based on a model generated time series for radiocarbon in the Arabian Sea. The deduced velocity (~ 28 m yr-1) of the advective transport of water between the gulf and the Arabian Sea is much lower than the surface tidal current velocity in this region, but can be understood in terms of net fluxes of carbon and radiocarbon to the gulf to match the observed coral D14C time series. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Chakraborty, S. Investigator : Ramesh, R. Investigator : Krishnaswami, S. 1995-05-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25252 https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/gkhdc14.dat https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/readme_india14c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/thtrd14c.dat https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/gkhdc14.dat https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/readme_india14c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/thtrd14c.dat English https://www.ncdc.noaa.gov/paleo/study/25252 https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/gkhdc14.dat https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/readme_india14c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/thtrd14c.dat S. Chakraborty, R. Ramesh, S. Krishnaswami1994Air-sea exchange of CO2 in the Gulf of Kutch, northern Arabian Sea based on bomb-carbon in corals and tree ringsJournal of Earth System Science1032329-34010.1007/BF02839542https://link.springer.com/article/10.1007/BF02839542 START YEAR: 1949 AD * END YEAR: 1990 AD 70 19.233 73.4 22.6