[Analysis of algae bloom and lake surface bright temperature in Chaohu Lake based on remote sensing data]

This article used the remote sensing data from 2002 to 2007 obtained by NOAA/AVHRR to analyze the relationship between algae bloom and lake surface bright temperature in Chaohu Lake. The spatial distribution of Chaohu Lake surface bright temperature was found to be similar to that of the occurrence frequencies of algae bloom. Algae blooms occurred frequently in the region with high bright temperature. In terms of temporal distribution, there was significant difference between the bright temperature and algae bloom, which indicated that the algae bloom could be affected by factors other than the temperature. From the analysis, the following conclusions were drawn. First, the break out season of algae bloom could be divided into spring and summer periods in annual variation, with May as the dividing point. In the spring break out season, the growth and propagation of algae did not depend on the temperature of water, and the affected areas of algae bloom were usually small. Secondly, with the increase of precipitation in July, the bright temperature and the occurrence frequency of algae bloom were decreased.