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D. Gerten, J. Heinke, H. Hoff, H. Biemans, M. Fader, and K. Waha

to put these changes into the context of, for example, global food production given demographic changes in addition to climatic changes. Until recently, most assessments and projections of worldwide water resources ( Vörösmarty et al. 2000 ; Arnell 2004 ; Alcamo et al. 2007 ; Islam et al. 2007 ) were focused on the “blue” water (BW) of rivers, lakes, reservoirs, and aquifers. However, it is “green” water (GW)—the precipitation water that infiltrates into the soil (Falkenmark et al. 2009)—that

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Philippe Lucas-Picher, Jens H. Christensen, Fahad Saeed, Pankaj Kumar, Shakeel Asharaf, Bodo Ahrens, Andrew J. Wiltshire, Daniela Jacob, and Stefan Hagemann

(EU) projects [Water and Global Change (WATCH), Twinning European and South Asian River Basins (BRAHMATWINN), and Himalayan Glacier Retreat and Changing Monsoon Pattern (HighNoon)] focused recently on the water cycle of the Indian monsoon and on potential future changes. The RCMs play an important role in these projects to downscale the coarse global climate simulations from GCMs and to provide regional climate information that takes into account regional forcings, feedbacks, and processes

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Aristeidis G. Koutroulis, Aggeliki-Eleni K. Vrohidou, and Ioannis K. Tsanis

used in the present study since they are better suited to monitor hydrological than agricultural droughts ( Hayes et al. 1999 ; Komuscu 1999 ). Although SPI is widely used for assessing drought occurrence, there are some limitations in providing relative information when applied for different regions (at river basin scale). For example, three watersheds A, B, and C ( Fig. 1 ) are considered with 720-, 1320-, and 1920-mm average annual rainfall, respectively, for the long-term period of 1970

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