The image shows transport of the green algae from Jiangsu Coast to Shandong Peninsular from 20 May to 13 June. The image suggests: 1) the source of the green algae seems to be originated from the Northern Jiangsu Shoal; 2) the area covered by the algae has been expanding rapidly north-eastward, and had covered almost entire Southern Yellow Sea by 13 June; 3) a recirculation pattern is visible that has formed a clockwise gyre first carrying the green algae offshore from early June and then transporting it south-westward back to the source of the origin. From the image, it can be predicted that the green tide can reach Qingdao coast within days. 

The source of image: Dr. Xing Qianguo, Yantai Institute of Coastal Zone of Chinese Academy of Sciences.