Abstract
The recently reached Paris Agreement at the 21st Conference of the Parties (COP21) of the United Nations Framework Convention on Climate Change (UNFCCC) in 2015 includes a goal of pursuing efforts to limit the global warming at 1.5 °C. Following this, the Intergovernmental Panel on Climate Change (IPCC) has accepted an invitation by the UNFCCC to create a special report in 2018 which will include the impacts of 1.5 °C global warming on various Earth systems. It is therefore a priority now for the scientific community to quantify these impacts at regional scales. As a contribution to this effort, this study assesses the impacts of 1.5 and 2 °C global warming on the extreme flows and water availability of the Brahmaputra River, which is both an essential source of freshwater for its lowermost-riparian Bangladesh and also an unavoidable source of disastrous floods. Future flows are simulated with the Soil and Water Assessment Tool (SWAT) and bias-corrected weather data of an ensemble of 11 climate projections from the Coordinated Regional Climate Downscaling Experiment (CORDEX). Results indicate that floods will be more frequent and flood magnitudes greater at 2 °C specific warming level (SWL) than at 1.5 °C SWL. On the contrary, low flows are expected to be less frequent and low flow values to be higher at 2 °C SWL than at 1.5 °C SWL. Water availability will likely be greater at 2 °C SWL than at 1.5 °C SWL from January to August. For the remaining months, water availability will likely be greater at 1.5 °C SWL rather than at 2 °C SWL.
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References
Abbaspour KC (2015) SWAT-CUP: SWAT calibration and uncertainty programs – a user manual. Swiss Federal Institute of Aquatic Science and Technology, Dübendorf
Abbaspour KC, Rouholahnejad E, Vaghefi S et al (2015) A continental-scale hydrology and water quality model for Europe: calibration and uncertainty of a high-resolution large-scale SWAT model. J Hydrol 524:733–752
Alam S, Ali MM, Islam ZI (2016) Future streamflow of Brahmaputra River basin under synthetic climate change scenarios. J Hydrol Eng. https://doi.org/10.1061/(ASCE)HE.1943-5584.0001435
Arino O, Bicheron P, Achard F et al (2008) GlobCover. The most detailed portrait of Earth. ESA Bull 136:25–31
Arnell NW, Brown S, Gosling SN et al (2016) The impacts of climate change across the globe: a multi-sectoral assessment. Clim Chang 134:457–474
Arnold JG, Srinivasan R, Muttiah RS, Williams JR (1998) Large area hydrologic modeling and assessment Part I: Model development. J Am Water Resour Assoc 34(1):73–89
FAO (1974) FAO-UNESCO soil map of the world, 1:5,000,000. UNESCO, Paris
Friedlingstein P, Andrew RM, Rogelj J et al (2014) Persistent growth of CO2 emissions and implications for reaching climate targets. Nat Geosci 7:709–714
Gain AK, Immerzeel WW, Weiland FCS, Bierkens MFP (2011) Impact of climate change on the stream flow of the lower Brahmaputra: trends in high and low flows based on discharge-weighted ensemble modelling. Hydrol Earth Syst Sci 15:1537–1545
Gassman PW, Sadeghi AM, Srinivasan R (2014) Applications of the SWAT model special section: overview and insights. J Environ Qual 43:1–8
Grillakis MG, Koutroulis AG, Tsanis IK (2013) Multisegment statistical bias correction of daily GCM precipitation output. J Geophys Res Atmos 118(8):3150–3162
Hargreaves GL, Hargreaves GH, Riley JP (1985) Agricultural benefits for Senegal River basin. J Irrig and Drain Engr 111(2):113–124
Immerzeel WW (2008) Historical trends and future predictions of climate variability in the Brahmaputra basin. Int J Climatol 28:243–254
Lehner B, Verdin K, Jarvis A (2008) New global hydrography derived from spaceborne elevation data. Eos, Transactions AGU 89(10):93–94
Masood M, Yeh PJ-F, Hanasaki N, Takeuchi K (2015) Model study of the impacts of future climate change on the hydrology of Ganges–Brahmaputra–Meghna basin. Hydrol Earth Syst Sci 19(2):747–770
Nepal S, Shrestha AB (2015) Impact of climate change on the hydrological regime of the Indus, Ganges and Brahmaputra river basins: a review of the literature. Int J Water Resour Dev 31(2):201–218
Pervez MS, Henebry GM (2015) Assessing the impacts of climate and land use and land cover change on the freshwater availability in the Brahmaputra River basin. J Hydrol: Reg Stud 3:285–311
Pilon PJ, Harvey KD (1993) Consolidated frequency analysis – reference manual. Environment Canada, Ottawa
Pilon PJ, Jackson RJ (1988) Low flow frequency analysis package – LFA. Environment Canada, Ottawa
Piontek F, Muller C, Pugh TAM et al (2014) Multisectoral climate impact hotspots in a warming world. Proc Natl Acad Sci U S A 111(9):3233–3238
Refsgaard JC, Madsen H, Andréassian V et al (2014) A framework for testing the ability of models to project climate change and its impacts. Clim Chang 122(1–2):271–282
Schleussner C-F, Lissner TK, Fischer EM et al (2016) Differential climate impacts for policy-relevant limits to global warming: the case of 1.5°C and 2°C. Earth System Dynamics 7:327–351
Shaw R, Mallick F, Islam A (2013) Disaster risk reduction approaches in Bangladesh. Springer Japan, Tokyo
Singh VP, Sharma N, Ojha CSP (2004) The Brahmaputra basin water resources. Springer Netherlands, Dordrecht
UNFCCC (2015a) Report on the structured expert dialogue on the 2013–2015 review. FCCC/SB/2015/INF.1
UNFCCC (2015b) Decision 1/CP.21, The Paris Agreement. FCCC/CP/2015/10/Add.1
van Vuuren DP et al (2011) The representative concentration pathways: an overview. Clim Chang 109:5–31
Weedon GP, Balsamo G, Bellouin N et al (2014) The WFDEI meteorological forcing data set: WATCH Forcing Data methodology applied to ERA-Interim reanalysis data. Water Resour Res 50(9):7505–7514
Acknowledgements
The research leading to these results has received funding from the European Union Seventh Framework Programme FP7/2007-2013 under grant agreement no. 603864 (HELIX: High-End cLimate Impacts and eXtremes; http://www.helixclimate.eu).
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Mohammed, K., Islam, A., Islam, G. et al. Extreme flows and water availability of the Brahmaputra River under 1.5 and 2 °C global warming scenarios. Climatic Change 145, 159–175 (2017). https://doi.org/10.1007/s10584-017-2073-2
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DOI: https://doi.org/10.1007/s10584-017-2073-2