Implications of irrigation for climate change impacts in India Delphine Deryng (University of East Anglia) Gang Zhao & Stefan Siebert (University of Bonn)

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Presentation transcript:

Implications of irrigation for climate change impacts in India Delphine Deryng (University of East Anglia) Gang Zhao & Stefan Siebert (University of Bonn) 10 September, 2014 Contact:

Study setup Region: India Crops: Maize, Soybean, Wheat* Climate change scenarios: CMIP5 (5 GCMs + RCP 8.5) Crop model: PEGASUS (+ 3 ISI-MIP crop models: GEPIC, pDSSAT, LPJmL) Irrigation data: 1.MIRCA2000 (Portmann et al., 2010) 2.National Informatics Centre in India NIC ( 3.Global Map of Irrigated Areas version 5 (GMIA5 Harvested areas: 1.Earthstat (Monfreda et al., 2008) 2.National Informatics Centre in India NIC ( * PEGASUS simulates spring wheat but the winter cultivar is typically grown in India

Irrigation and crop data used MIRCA2000NIC + NRSCNIC + GMIA5 Year Cropland Census data District level District level District level Remote sensing1 km56 m56 m Crop type Census data Diverse District level District level Irrigated land Census data District level District level District level Spatial pattern GMIA4--- GMIA5 Irrigated crops Census data State District level ---

Differences in crop rainfed and irrigated areas Harvested Area

Irrigated crop area

Maize

Wheat

Soybean

Impact of crop and irrigation data on yield simulated for climate change

PEGASUS % change in yield in 2020s

PEGASUS % change in yield in 2050s

Implication for crop simulations Impact on Maize production by the 2020s under business as usual GHG emissions pathway (RCP 8.5)

Implication for crop simulations Impact on Maize production by the 2020s under business as usual GHG emissions pathway (RCP 8.5)

Sources of uncertainties HadGEM2-ES RCP s GEPIC pDSSAT LPJmL PEGASUS

Sources of uncertainties HadGEM2-ES RCP s GEPIC pDSSAT LPJmL PEGASUS CO 2 fertilisation effect Extreme heat stress Detailed point-specific crop models: Different calibration methods, planting dates decisions, cultivars…

Discussion & Questions Large differences in irrigation and harvested areas concern small producing regions  However these regions are likely to be more vulnerable to climate change impact on irrigation water resources and crop yields (?) Classification of the sources of modelling uncertainties: 1.Crop models (they include difference processes and calibration process differ) 2.Climate input (GCMs) 3.Irrigation and crop data Why???

Discussion & Questions Why is the impact of improved irrigation and crop data on simulated yield relatively small???  Change in yield under changing climate investigated => low resolution of climate change signal versus high resolution crop and irrigation data => data effect maybe larger in high resolution regional studies  Current global crop models cannot simulate realistic cropping seasons in multiple cropping regions => this may have contributed to strong differences across models

PEGASUS National data (NIC)

Thank You! Please do me if you have any questions, comments, suggestions!