Dry (Wet) -Cold (Warm) Trend in the Huang-Huai-Hai Plain of China: Using a Compound Trend Identification Method

The impact of climate change on the human living environment cannot be underestimated. It not only leads to frequent extreme climate events but also changes the dry-wet and cold-warm structures in various regions. As a critical grain-producing area in China, it is essential to analyze the changes in climatic conditions in Huang-Huai-Hai Plain. In this work, we mainly designed a method to determine the compound dry-wet and cold-warm structural changes and constructed an index to quantify this change. The compound trend characteristics of this period were analyzed using the remote sensing precipitation data and temperature reanalysis data from 2001 to 2021 in the Huang-Huai-Hai region. The results show that: the study area gradually changed from drying-cooling to wetting-warming during 2006-2016. Although some areas of the Huang River Basin (especially the southern part of the Huang River) align with this trend, there is still a phenomenon of drying on the whole.