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    Bomb-radiocarbon in the Northern Indian Ocean

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    Date
    2024
    Author
    Harshraj,
    Kurian, S.
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    Abstract
    Bomb-radiocarbon is a useful tracer to study ocean circulation and air-sea CO2 exchange processes. In the present study bomb radiocarbon distribution in dissolved inorganic carbon of the Northern Indian Ocean around late 2010s has been evaluated. In the late 2010s surface waters in the Northern Indian Ocean had ?14C values ranging between 9 and 17 which is comparable or even higher than that of the contemporaneous atmospheric ?14C values. Water column measurements showed that the bomb 14C inventory in the Arabian Sea and the Bay of Bengal has increased between 1990s and 2010s. During the same period, the eastern and western equatorial Indian Ocean showed either no change or a slight decline in the water column bomb 14C inventory. These bomb 14C inventory values were also used to estimate the air-sea CO2 exchange rate and net CO2 flux over the Northern Indian Ocean region. Bomb 14C-based estimate of net CO2 flux from the Arabian Sea is 75 24 Tg C yr?1 and the Bay of Bengal is 1 7 Tg C yr?1, which is comparable to the estimates reported by previous investigations in the region. The present observations show that the bomb 14C is being transferred to the deeper depths of the ocean, emphasizing the need for continued 14C measurements to gain further insights into subsurface processes in the region.
    URI
    https://doi.org/10.1016/j.marchem.2024.104459.
    http://drs.nio.res.in/drs/handle/2264/9327
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