Drought assessment of China in 2002–2017 based on a Detrended Combined Climatological Deviation Index

Detrended-CCDI.zip:The monthly drought results were identified by Detrended-CCDI from April 2002 to August 2017.Detrended-CCDI was calculated using GRACE data and precipitation data after the seasonal decomposition of time series based on the Loess (STL) method. Drought frenquency.zip:Drought frequency is the “n/m” ratio per pixel. “n” is the number of consecutive months (more than or equal to 3 months) in which Detrended-CCDI was less than or equal to -0.53, and “m” is the total number of months in the study period. Drought trend.zip:Drought trend was obtained using the modified Mann-Kendall (MMK) trend test method. Regional drought events.zip:A regional drought event is defined when the area where Detrended-CCDI is less than or equal to - 0.53 exceeds 100,000 km² and the duration is more than 3 months. The severity of drought events is expressed by the average cumulative value of monthly Detrended-CCDI pixels.