| Abstract:In order to understand the characteristics and dynamics of eco-climate in the Yangtze River Delta (YRD) urban agglomeration, remote sensing, GIS and principal component analysis (PCA) methods were used to improve the existing remote sensing ecological index (RSEI) based on daily observation data of air temperature, precipitation, relative humidity and wind speed from 111 meteorological stations, as well as MODIS normalized differential vegetation index (NDVI) and land surface temperature (LST) data. A regional integrated eco-climatic index (IECI) was constructed from the aspects of dryness/wetness, comfortableness, greenness, heatness and air cleanliness, and the dynamic characteristics of eco-climate in YRD urban agglomeration were analyzed. The results showed that during 2001?2018, the averaged fractional vegetation cover (FVC) increased significantly with a linear trend of 2.80% per decade, and the mixed layer height (MLH) decreased significantly at a rate of 51.3m per decade. The regional IECI decreased significantly with a linear trend of 0.10 per decade, and showed a trend of regional overall decrease. Human activities and urbanization had significant effects on eco-climate change in the YRD urban agglomeration. It is necessary to strengthen the protection and improvement of eco-climate while promoting economic and social development, so as to achieve harmonious coexistence between humans and nature. |