GRACE and GRACE-FO intermittent periods are 11 months. The calculation formula of
GRACE and GRACE-FO intermittent periods are 11 months. The calculation formula of reconstruction TWSC data is as follows [25]: TWSCrec = P (1)where TWSCrec could be the reconstruction TWSC information, P is month-to-month PSB-603 In Vitro precipitation information, is definitely the calibration parameter on the long-term trend term, and may be the calibration parameter on the seasonal term. To evaluate the high quality in the data set, we calculated the RMS of GRACE/GRACE-FO TWSC information and reconstructed TWSC information inside the very same time period. The particular outcomes is presented within the Appendix A. 3.three. Standardized Precipitation Evapotranspiration Index (SPEI) Information The SPEI is calculated from the cumulative sum with the distinction between precipitation and potential ET on diverse time scales following the exact same process to compute the standardized precipitation index (SPI) [26]. In this study, the spatial resolution of SPEI gridded information is 1 1 . These datasets had been calculated by using the precipitation information derived from International Precipitation Climatology Centre plus the possible ET information derived from National Oceanic and Atmospheric Administration. SPEI has three time scales of three months, six months, and 12 months. The 3-month scale is linked with variations in soil moisture: agricultural drought; the 6-month scale is associated with variations in streamflow: hydrological drought; and the 12-month scale is related with variations in IQP-0528 HIV groundwater storage: hydrogeological drought [27]. Hence, SPEI data on various time scales can be employed for monitoring unique sorts of drought events. In this study, we used these gridded data from April 2002 to December 2018. three.four. Self-Calibrating Palmer Drought Severity Index (SCPDSI) Data The SCPDSI is really a variant around the original PDSI of Palmer [28], using the aim of creating final results from distinct climate regimes extra comparable. As with the PDSI, the SCPDSI was calculated from the time series of precipitation and temperature, together with fixed parameters related for the soil/surface qualities at every single place [29,30]. The month-to-month worldwide gridded SCPDSI data with a spatial resolution 0.5 0.5 had been offered by ClimateAppl. Sci. 2021, 11,five ofResearch Unit (CRU) at University of East Anglia. In this study, we used these gridded data from April 2002 to December 2019. 3.5. In Situ Drought Data The in situ meteorological drought data was derived from the Chinese Flood and Drought Yearbooks that have been published by the China Ministry of Water Resource [31] for the period of 2006019. In the yearbooks, the definition of a drought disaster is definitely an occasion that causes water shortages because of decreased precipitation and insufficient water provide for water projects and causes harm to life, production, and ecology. The yearbooks provided the start off and end time of drought disaster, the administrative area impacted by drought, the loss of crops, the number of people today who have difficulty accessing drinking water, and a textual description of drought disaster. In our study, we employed the information on the begin and end time on the drought disaster to evaluate the accuracy in the strategy used in this paper to detect the drought events. 3.6. In Situ Precipitation Information Monthly gridded precipitation data in MC for the time period among April 2002 and December 2020 supplied by the China National Meteorological Science Data Center and sorted by the National Meteorological Details Center using a spatial resolution 0.five 0.five were utilized for the analysis. 4. Techniques four.1. GRACE-DSI Before calculati.