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Title
Japanese: 
English:Re-evaluation of future water stress due to socio-economic and climate factors under a warming climate 
Author
Japanese: 木口雅司, Yanjun Shen, 鼎信次郎, 沖大幹.  
English: Masashi Kiguchi, Yanjun Shen, Shinjiro Kanae, Taikan Oki.  
Language English 
Journal/Book name
Japanese: 
English:Hydrological Sciences Journal 
Volume, Number, Page Vol. 60    1    page 14-29
Published date Jan. 2015 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://www.tandfonline.com/doi/abs/10.1080/02626667.2014.888067
 
DOI https://doi.org/10.1080/02626667.2014.888067
Abstract We re-evaluated a method to estimate water stress changes as a function of increasing global mean temperature. Trends in the total population under high water stress (defined as when the annual water withdrawal divided by the annual water availability is higher than 0.4) now and in the future (total HWSP) and the population exposed to high water stress in the future but not now (add_HWSP) are dependent on differences in each scenario, not the global mean temperature increase. The ensemble mean of the total HWSP and its ratio for emissions scenarios A1B and B1 are close to constant values and decreased when the global mean temperature increase exceeded 1.9°C and 1.3°C, respectively. If the global mean temperature increase reaches a maximum ensemble-mean value in each scenario, the total HWSP (its ratio) in scenarios A1B, A2 and B1 was about 4.5 billion (0.54), 8.6 billion (0.64) and 4.1 billion (0.49), respectively. We estimated the contributions of climate change to runoff, water withdrawal and population growth on total HWSP and add_HWSP to separate the influences of climate change and socio-economic change. Climate change and socio-economic factors (water withdrawal and population growth) decreased and increased add_HWSP, respectively.

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