Abstract:
Based on the long-term data of daily precipitation and temperature from 8 national meteorological stations and 88 regional representative stations in Jinhua area, the spatial-temporal distribution characteristics of drought days and drought intensity were analyzed with Composite Meteorological Drought Index (CI) and Meteorological Drought Composite Index (MCI) as monitoring indexes. And we compared the applicability of the two indices for drought monitoring. The results show that: 1953—2022 The number of drought days in Jinhua showed a non-significant decrease trend, and the overall drought intensity weakened, with significant mutations in 2012 and 2014. In terms of spatial distribution, from 2010 to 2022, the drought intensity and drought days in Jinhua region showed an overall distribution pattern of more in plain areas and less in mountainous areas. The drought degree had a trend of aggravation in the northeast area and alleviation in the southeast area. In the two typical drought events of 2011 and 2022, the two indices generally showed synchronous changes in the evolution of the drought process. However, differences were observed in parameters such as average intensity and mutation response. The average drought intensity monitored by CI is stronger, while MCI has slightly more drought days and greater interannual fluctuations compared to CI. The onset and end times of drought monitored by MCI are slightly later, and CI is more sensitive to precipitation response with more jumping phenomena.