[1] Report on Drought and Countries Affected by Drought During 1974-1985[J]. WMO, Geneva(1986).

[2] QX/T81-2007 wheat drought disaster grade[J]. Beijing: China Meteorological Administration(2007).

[3] MISHRAA, SINGH VP. A review of drought concepts[J]. Journal of Hydrology, 391, 202-216(2010).

[4] DAIA. Drought under global warming: A review[J]. Wiley Interdisciplinary Reviews: Climate Change, 2, 45-65(2011).

[5] LI WZ, PENG CH, ZHANGY et al. Monitoring and estimating drought-induced impacts on forest structure, growth, function, and ecosystem services using remote-sensing data: Recent progress and future challenges[J]. Environmental Reviews, 2, 103-115(2013).

[6] LIU XF, PAN YZ, ZHU XF et al. Agricultural drought monitoring: Progress, challenges, and prospects[J]. Journal of Geographical Sciences, 26, 750-767(2016).

[7] DU LT, TIAN QJ, YUT et al. A comprehensive drought monitoring method integrating MODIS and TRMM data[J]. International Journal of Applied Earth Observation and Geoinformation, 23, 245-253(2013).

[8] 王有民, 张强, 邹旭恺, WANG YM, ZHANGQ, ZOU XK et al. Progress in drought indicators and national drought monitoring in China and the United States[J]. Meteorology, 6-9(2005).

[9] 肖风劲, 张强, 邹旭凯, XIAOF J, ZHANGQ, ZOU XK. Meteorological Drought Grade.GB/T 20481-2006, National Standard of the People's Republic of China(2006).

[10] HABOUDANED, MILLER JR, PATTEYE et al. Hyperspectral vegetation indices and novel algorithms for predicting green LAI of crop canopies[J]. Remote Sensing of Environment, 90, 337-352(2004).

[11] ANDERSENJ, RASMUSSENK, SANDHOLTI. A simple interpretation of the surface temperature-vegetation index space for assessment of surface moisture status[J]. Remote Sensing of Environment, 79, 213-224(2002).

[12] 龚健雅, 李小文, 王鹏新, GONG JY, LI XW, WANG PX. Drought monitoring model based on vegetation index and land surface temperature[J]. Progress in Geosciences, 18, 527-533(2003).

[13] THEON JS. The tropical rainfall measuring mission (TRMM)[J]. Advances in Space Research, 14, 159-165(1994).

[14] 贾艳青, 张勃, JIA YQ, ZHANGB. Evolution characteristics of extreme dry and wet events in northern China from 1960 to 2016[J]. Journal of Natural Resources, 34, 1543-1554(2019).

[15] 范琳琳, 罗文兵, 王红瑞, FAN LL, LUO WB, WANG HR et al. Spatial characteristics of drought and flood in Beijing-Tianjin-Hebei region and their impact on agricultural water use[J]. Rural Water Resources and Hydropower in China, 150-155(2016).

[16] 安淳淳, 焦俏, 王飞, AN CC, JIAOQ, WANGF et al. Remote sensing analysis of soil moisture and irrigation characteristics in typical arid years in North China Plain[J]. Soil and Water Conservation Science of China, 14, 123-129(2016).

[17] 方宏阳, 栾清华, 杨志勇, FANG HY, LUAN QH, YANG ZY et al. Spatial and temporal variation characteristics of drought and flood in Beijing, Tianjin and Hebei region based on SPI[J]. Water Resources and Hydropower Technology, 44, 13-16(2013).

[18] 李双双, 刘焱序, 杨赛霓, LI SS, LIU YX, YANG SN et al. Spatial and temporal clustering characteristics of drought-rainstorm-heat wave disasters in Beijing-Tianjin-Hebei region from 1960 to 2013[J]. Scientia Geographica Sinica, 36, 149-156(2016).

[19] 李双双, 刘宪锋, 杨赛霓, LI SS, LIU XF, YANG SN. Modeling of non-process-oriented multi-hazard space-time Network: Taking the coupling of drought and heat waves in Beijing-Tianjin-Hebei region as an example[J]. Geographical Research, 36, 1415-1427(2017).

[20] KIOUTSIOUKISI, MELASD, ZANISP. Statistical downscaling of daily precipitation over Greece[J]. International Journal of Climatology, 28, 679-691(2008).

[21] CHEN FR, LIUQ, LIUY et al. Spatial downscaling of TRMM 3B43 precipitation considering spatial heterogeneity[J]. International Journal of Remote Sensing, 35, 3074-3093(2014).

[22] LV AF, ZHOUL. A rainfall model based on a geographically weighted regression algorithm for rainfall estimations over the Arid Qaidam Basin in China[J]. Remote Sensing, 8, 1-17(2016).

[23] DROOGERSP, IMMERZEEL WW, RUTTEN MM. Spatial downscaling of TRMM precipitation using vegetative response on the Iberian Peninsula[J]. Remote Sensing of Environment, 113, 362-370(2009).

[24] JIA SF, LV AF, ZHU WB et al. A statistical spatial downscaling algorithm of TRMM precipitation based on NDVI and DEM in the Qaidam Basin of China[J]. Remote Sensing of Environment, 115, 3069-3079(2011).

[25] CHENC, DUANZ, SH et al. An improved spatial downscaling procedure for TRMM 3B43 precipitation product using geographically weighted regression[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 8, 4592-4604(2015).

[26] BRUNSDONC, CHARLTONM, FOTHERINGHAM AS. Geographically Weighted Regression[J]. New York: Wiley(2002).

[27] BASTIAANSSENW G M, DUANZ. First results from Version 7 TRMM 3B43 precipitation product in combination with a new downscaling-calibration procedure[J]. Remote Sensing of Environment, 131, 1-13(2013).

[28] DOESKEN NJ, KLEISTJ, MCKEE TB. The relationship of drought frequency and duration to time scales[C]. Proceedings of the 8th Conference on Applied Climatology: American Meteorological Society Boston, MA, 179-183(1993).

[29] PEREIA AR, PRUITT WO. Adaptation of the Thornthwaite scheme for estimating daily reference evapotranspiration[J]. Agricultural Water Management, 66, 251-257(2004).

[30] TRAJKORICS. Temperature-based approaches for estimating reference evapotranspiration[J]. Journal of Irrigation and Drainage Engineering, 131, 316-325(2005).

[31] KOGAN FN. Global drought watch from space[J]. Bulletin of the American Meteorological Society, 78, 621-636(1997).

[32] GREVEP, MUELLERB, ORLOWSKYB et al. Global assessment of trends in wetting and drying over land[J]. Nature Geoscience, 7, 716-721(2014).

[33] FENG HH, ZHANG MY. Global land moisture trends: Drier in dry and wetter in wet over land[J]. Scientific Reports, 7, 18018(2015).

[34] DING YH, SUNY, WANG ZY. Inter-decadal variation of the summer precipitation in East China and its association with decreasing Asian summer monsoon. Part I: Observed evidences[J]. International Journal of Climatology, 28, 1139-1161(2008).

[35] DING YH, SUNY, WANG ZY. Inter-decadal variation of the summer precipitation in China and its association with decreasing Asian summer monsoon (Part II): Possible causes[J]. International Journal of Climatology, 29, 1926-1944(2009).