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Ulva prolifera  blooms have occurred every summer in the South Yellow Sea since 2008.  U. prolifera  blooms appeared in the area near the Jiangsu shoal and then were driven to the Shandong Peninsula by the prevailing summer winds. The blooms covered a maximum area of more than 50000 km 2  and had an aggregate estimated biomass of 3.64 × 10 5  tons. Large number of  U. prolifera  dissipation in the natural degradation and this cause a serious impact on the marine environment. We used MODIS, HJ-1A/B and GF-1 remote sensing image data to conduct large-scale monitoring of  U. prolifera . Combined with sea surface monitoring station data from Haiyang city, Shandong province, we analyzed the impact of  U. prolifera  death on the coastal sea environment of Haiyang city from 2012 to 2016 using multiple regression analysis. It showed that chlorophyll-a concentration was related to sea surface temperature (SST), salinity, dissolved inorganic nitrogen (DIN) and phosphate (R 2  = 0.50, P &lt; 0.001). Among these, DIN and phosphate were important factors affecting chlorophyll-a concentration. There was a significant positive correlation between chlorophyll-a concentration and DIN, but a significant negative correlation between chlorophyll-a concentration and phosphate. The nutrients released by the decomposition of  U. prolifera  enhanced the growth of planktonic microalgae, and increased the mean chlorophyll-a concentration from 1.398 μmol/L to 2.819 μmol/L during May to August in the study area. This increased the Level of eutrophication in the coastal area and contributed to blooms of secondary algae such as red tides.

The seasonal dissipation of Ulva prolifera and its effects on environmental factors: based on remote sensing images and field monitoring data