The authors thank two anonymous reviewers and editor Dr. Aiguo Dai for their helpful comments and suggestions. We thank Dr. Debashis Nath for a careful and thorough review of the manuscript. This work was supported by the Special Scientific Research Project for Public Interest under Grant 201006009, the National Basic Research Program of China under Grant 2009CB421405, and the National Natural Science Foundation of China under Grant 41175041.
Bi, X., , W. Zhang, , and H. Hu, 2007: The spatial–temporal evaluation and variability study on the aridity of northern China using ESDA. Geoinformatics 2007: Geospatial Information Science, J. Chen, Ed., International Society for Optical Engineering (SPIE Proceedings, Vol. 6753), doi:10.1117/12.761885.
Bueh, C., , U. Cubasch, , Y. Lin, , and L. Ji, 2003: The change of North China climate in transient simulations using the IPCC SRES A2 and B2 scenarios with a coupled atmosphere–ocean general circulation model. Adv. Atmos. Sci., 20, 755–766.
Burke, E. J., , S. J. Brown, , and N. Christidis, 2006: Modeling the recent evolution of global drought and projections for the twenty-first century with the Hadley Centre climate model. J. Hydrometeor., 7, 1113–1125.
Chen, Y., , C. Xu, , X. Hao, , W. Li, , Y. Chen, , C. Zhu, , and Z. Ye, 2009: Fifty-year climate change and its effect on annual runoff in the Tarim River Basin, China. Quat. Int., 208, 53–61.
Dai, A., 2011: Characteristics and trends in various forms of the Palmer Drought Severity Index during 1900–2008. J. Geophys. Res.,116, D12115, doi:10.1029/2010JD015541.
Dai, A., , K. Trenberth, , and T. Qian, 2004: A global dataset of Palmer Drought Severity Index for 1870–2002: Relationship with soil moisture and effects of surface warming. J. Hydrometeor., 5, 1117–1130.
Harris, I., , P. D. Jones, , T. J. Osborn, , and D. H. Lister, 2013: Updated high-resolution grids of monthly climatic observations—The CRU TS3.10 dataset. Int. J. Climatol.,in press.
Hobbins, M. T., , A. Dai, , M. L. Roderick, , and G. D. Farquhar, 2008: Revisiting the parameterization of potential evaporation as a driver of long-term water balance trends. Geophys. Res. Lett.,35, L12403, doi:10.1029/2008GL033840.
Hu, Z., , L. Bengtsson, , and K. Arpe, 2000: Impact of global warming on the Asian winter monsoon in a coupled GCM. J. Geophys. Res., 105 (D4), 4607–4624.
Hu, Z., , S. Yang, , and R. Wu, 2003: Long-term climate variations in China and global warming signals. J. Geophys. Res.,108, 4614, doi:10.1029/2003JD003651.
Jiang, D., , M. Su, , R. Wei, , and B. Liu, 2009: Variation and projection of drought and wet conditions in Xinjiang. Chin. J. Atmos. Sci., 33, 90–98.
Kistler, R., and Coauthors, 2001: The NCEP–NCAR 50-Year Reanalysis: Monthly means CD-ROM and documentation. Bull. Amer. Meteor. Soc., 82, 247–267.
Labat, D., , Y. Godderis, , J. Probst, , and J. Guyot, 2004: Evidence for global runoff increase related to climate warming. Adv. Water Resour., 27, 631–642.
Li, Z. Q., , W. B. Wang, , M. J. Zhang, , F. T. Wang, , and H. L. Li, 2010: Observed changes in streamflow at the headwaters of the Urumqi River, eastern Tianshan, central Asia. Hydrol. Processes, 24, 217–224.
McKee, T. B., , N. J. Doesken, , and J. Kleist, 1993: The relationship of drought frequency and duration to time scales. Preprints, Eighth Conf. on Applied Climatology, Anaheim, CA, Amer. Meteor. Soc., 179–184.
Mitchell, T. D., , and P. D. Jones, 2005: An improved method of constructing a database of monthly climate observations and associated high-resolution grids. Int. J. Climatol., 25, 693–712, doi:10.1002/joc.1181.
Palmer, W. C., 1965: Meteorological drought. U.S. Department of Commerce, Weather Bureau, 58 pp.
Shi, X., , and X. Xu, 2007: Regional characteristics of the interdecadal turning of winter/summer climate modes in Chinese mainland. Chin. Sci. Bull., 52, 101–112.
Shi, Y., , Y. Shen, , and R. Hu, 2002: Preliminary study on signal, impact and foreground of climatic shift from warm-dry to warm-humid in northwest China. J. Glaciol. Geocryol., 24, 219–226.
Shi, Y., , Y. Shen, , and D. Li, 2003: Discussion on the present climate change from warm-dry to warm-wet in northwest China. Quat. Sci., 23, 152–164.
Shi, Y., , Y. Shen, , E. Kang, , D. Li, , Y. Ding, , G. Zhang, , and R. Hu, 2007: Recent and future climate change in northwest China. Climatic Change, 80, 379–393.
Shuttleworth, W. J., 1992: Evaporation. Handbook of Hydrology, D. R. Maidment, Ed., McGraw-Hill, 4.1–4.53.
Solomon, S., , D. Qin, , M. Manning, , Z. Chen, , M. Marquis, , K. Averyt, , M. Tignor, , and H. L. Miller Jr., Eds., 2007: Climate Change 2007: The Physical Science Basis. Cambridge University Press, 996 pp.
van der Schrier, G., , P. D. Jones, , and K. R. Briffa, 2011: The sensitivity of the PDSI to the Thornthwaite and Penman–Monteith parameterizations for potential evapotranspiration. J. Geophys. Res.,116, D03106, doi:10.1029/2010JD015001.
Vicente-Serrano, S. M., , S. Beguería, , and J. I. López-Moreno, 2010: A multiscalar drought index sensitive to global warming: The standardized precipitation evapotranspiration index. J. Climate, 23, 1696–1718.
Webb, R. S., , C. E. Rosenzweig, , and E. R. Levine, 1993: Specifying land surface characteristics in general circulation models: Soil profile data set and derived water-holding capacities. Global Biogeochem. Cycles, 7, 97–108.
Zhai, J., , B. Su, , V. Krysanova, , T. Vetter, , C. Gao, , and T. Jiang, 2010: Spatial variation and trends in PDSI and SPI indices and their relation to streamflow in 10 large regions of China. J. Climate, 23, 649–663.
Zuo, H., , D. Li, , Y. Hu, , Y. Bao, , and S. Lu, 2005: Characteristics of climatic trends and correlation between pan-evaporation and environmental factors in the last 40 years over China. Chin. Sci. Bull., 50, 1235–1241.