Identification of the Compound Dry(Wet)-Cool(Warm) Trend in the Huang-Huai-Hai Plain, China, 2001 -2021

We present a method to determine the compound dry (wet) -cool (warm) trend (DCT) type (including drying-cooling, wetting-cooling, drying-warming, and wetting-warming) and the Dry (wet) -Cool (warm) Trend Intensity Index (DCTII) based on temperature and precipitation data. The compound DCT type and trend intensity of the Huang-Huai-Hai Plain(HHH Plain) from 2001 to 2021 were obtained, and its variation characteristics in time and space were studied.