Air-sea CO2 exchange rate in the northern Indian Ocean based on coral radiocarbon records
2022
Raj, Harsh | Bhushan, Ravi | Banerji, Upasana S. | Muruganantham, M. | Shah, Chinmay | Nambiar, Romi | Dabhi, Ankur J.
Corals growing in shallow oceanic regions record the radiocarbon variations in ocean surface waters. Tracing bomb radiocarbon in various carbon reservoirs, can help understand the pathways and rates of carbon exchange between the different reservoirs. The northern Indian Ocean comprising two adjoining basins the Arabian Sea and the Bay of Bengal demonstrates contrasting behaviour both in its hydrological condition and CO₂ sequestration. In this study, coral based bomb radiocarbon records from the Lakshadweep Islands and the Andaman Islands in the northern Indian Ocean have been analysed. The estimates of air-sea CO₂ exchange rate based on bomb radiocarbon for the Lakshadweep is 13.4 ± 2.1 mol m⁻² yr⁻¹ and for the northern Andaman is 8.8 ± 1.3 mol m⁻² yr⁻¹. The bomb radiocarbon based air-sea CO₂ exchange over the Indian Ocean follow the trend of empirical relationship with wind speed. Using the air-sea CO₂ exchange rates, the net regional CO₂ fluxes over the Lakshadweep and the northern Andaman region has been determined.
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