noaa-other-25252 Radiocarbon Data from Indian Tree-Rings and Corals Chakraborty, S.; Ramesh, R.; Krishnaswami, S. Radiocarbon Data from Indian Tree-Rings and Corals 1995-05-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25252 Investigator S. Chakraborty Investigator R. Ramesh Investigator S. Krishnaswami earth science paleoclimate others geoscientificInformation 1949 AD 1990 AD 1 cal yr BP -40 cal yr BP Complete 19.233 22.6 70 73.4 Ocean Indian Ocean Arabian Sea Gulf of Kutch>LATITUDE 22.6>LONGITUDE 70 Continent Asia Southcentral Asia India Thane>LATITUDE 19.233>LONGITUDE 73.4 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII S. Chakraborty, R. Ramesh, S. Krishnaswami 1994 Journal of Earth System Science 103 2 329-340 10.1007/BF02839542 https://link.springer.com/article/10.1007/BF02839542

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/gkhdc14.dat Data File; Gulf of Kutch Coral D14C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/readme_india14c.txt Data Description; Indian Tree-Ring and Coral Radiocarbon Data Readme File GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/radiocarbon/thtrd14c.dat Data File; Thane Tree-Ring D14C Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11