E d i t y o u r s l o g a n h e r e 1 Department of Hydraulic Engineering, Tsinghua University, China 2 International Food Policy Research Institute Global Irrigation Requirement under the scenario of SRA1B Zhentao Cong 1 , Jun Liu 1 , Tingju Zhu 2 ICCCFS 2011
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Cong Zhentao — Global irrigation requirement under the scenario of sra1 b
The Chinese Academy of Agricultural Sciences (CAAS) and the International Food Policy Research Institute (IFPRI) jointly hosted the International Conference on Climate Change and Food Security (ICCCFS) November 6-8, 2011 in Beijing, China. This conference provided a forum for leading international scientists and young researchers to present their latest research findings, exchange their research ideas, and share their experiences in the field of climate change and food security. The event included technical sessions, poster sessions, and social events. The conference results and recommendations were presented at the global climate talks in Durban, South Africa during an official side event on December 1.
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E d i t y o u r s l o g a n h e r e
1 Department of Hydraulic Engineering, Tsinghua University, China2 International Food Policy Research Institute
Global Irrigation Requirement under the scenario of SRA1B
Zhentao Cong1, Jun Liu1, Tingju Zhu2
ICCCFS2011
Background
Irrigation is by far the largest single user of water globally, accounting for approximately 70% of global water withdrawal and 90% of global consumptive water use (FAO, 2011)Irrigated land accounts for no more than 20% of the world's cultivated land, but contributes about 40% of all agricultural production and 60% of cereal production (FAO, 2011). Assessing irrigation water requirement under climate change is essential for understanding potential future water crisis and food security. Given the potential impacts of climate change on irrigation water uses, estimating climate change impacts on irrigation water requirements is a critical step towards evaluating how much water will be needed for irrigation in the future (Döll, 2002).
Framework
Rn, T, RH, u (monthly)
ET0 – Reference Evapotranspiration
Crop water requirement ETc = Kc*ET0
FAO-Penman-Monteith
FAO-KcSAGE
Net Irrigation RequirementIR = ETc-Pe
Pe – Effective Precipitation
IPCC Scenarios + GCMs
IPCC Scenarios and GCMs
Scenarios1PTO2X CO2 concentration increase 1% /year, until DOUBLE; constant thereafter.
1PTO4X CO2 concentration increase 1%/year, until QUADRUPLE; constant thereafter.
20C3M Greenhouse gasses increasing as observed through the 20th century.
COMMIT Atmospheric burdens of long‐lived greenhouse gasses are held fixed at AD2000 levels.
PICTL Constant pre‐industrial levels of greenhouse gasses.
SRA1BRapid economic growth; Population peaks in mid‐century and declines thereafter; New and more efficient technologies; Balanced energy sources.
SRB1Convergent world: Same population as SRA1B; Rapid changes in economic structures(towards service and information); Reductions in material intensity; Clean and resource‐efficient technologies.