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Publication - Dr Matthew Rigby

    Atmospheric observations show accurate reporting and little growth in India's methane emissions

    Citation

    Ganesan, A, Rigby, M, Lunt, M, Parker, RJ, Boesch, H, Goulding, N, Umezawa, T, Zahn, A, Chatterjee, A, Prinn, RG, Tiwari, Y, Schoot, Mvd & Krummel, PB, 2017, ‘Atmospheric observations show accurate reporting and little growth in India's methane emissions’. Nature Communications, vol 8.

    Abstract

    Changes in tropical wetland, ruminant or rice emissions are thought to have played a role in recent variations in atmospheric methane (CH4) concentrations. India has the world's largest ruminant population and produces ∼ 20% of the world's rice. Therefore, changes in these sources could have significant implications for global warming. Here, we infer India's CH4 emissions for the period 2010-2015 using a combination of satellite, surface and aircraft data. We apply a high-resolution atmospheric transport model to simulate data from these platforms to infer fluxes at sub-national scales and to quantify changes in rice emissions. We find that average emissions over this period are 22.0 (19.6-24.3) Tg yr-1, which is consistent with the emissions reported by India to the United Framework Convention on Climate Change. Annual emissions have not changed significantly (0.2 ± 0.7 Tg yr-1) between 2010 and 2015, suggesting that major CH4 sources did not change appreciably. These findings are in contrast to another major economy, China, which has shown significant growth in recent years due to increasing fossil fuel emissions. However, the trend in a global emission inventory has been overestimated for China due to incorrect rate of fossil fuel growth. Here, we find growth has been overestimated in India but likely due to ruminant and waste sectors.

    Full details in the University publications repository