Spatial-Temporal Distribution Analysis Based on Multiyear HAB Extraction in the Yellow Sea of China

In order to research the multi-year spatial-temporal distribution of Harmful Algal Bloom (HAB) in the South Yellow Sea of China, NDVI method was used to extract HAB from MODIS images after Cloud removal by a comprehensive threshold method explored in this paper. Then, the growth law and spatial-temporal distribution of HAB are analyzed by the method of standard deviation ellipse and superposition analysis. It shows that the periphery of the radial sand ridge area off the coast of Jiangsu Province is the main birthplace of the HAB. Entering the breeding period, the northward drift speed as well as the diffusion speed of HAB accelerates. Until late June, it invades the coast of Shandong Province. In the early stage of HAB growth, preventing the spreading along the northeast-southwest direction will effectively restrain the HAB.