夜幕下的海岸为何会出现“蓝眼泪”？（自然讲堂）

Core Insights - The phenomenon known as "blue tears" has recently appeared along the coast of China, attracting numerous tourists [1][2] - "Blue tears" are primarily caused by bioluminescent dinoflagellates, which emit blue light when disturbed [1] - The occurrence of "blue tears" is influenced by various factors including marine conditions, biological factors, and weather [1] Group 1: Occurrence and Conditions - "Blue tears" have been observed in multiple coastal regions across China, including southern areas like Hainan, Guangxi, Guangdong, Fujian, and Zhejiang, as well as northern regions such as Shandong, Tianjin, Hebei, and Liaoning [2] - The best viewing period for "blue tears" in Pingtan, Fujian, is from March to June each year [2] - Optimal conditions for the appearance of "blue tears" include sea temperatures between 21-23 degrees Celsius and wind speeds of 3-4 [1] Group 2: Forecasting and Tourism Impact - Since 2017, the Pingtan Comprehensive Experimental Zone Meteorological Bureau has conducted research on forecasting "blue tears" using big data analysis and machine learning algorithms [2] - The implementation of a forecasting service for "blue tears" began in March 2020, allowing predictions for the next five days [2] - The number of tourists visiting Pingtan to see "blue tears" has significantly increased, with over 10 million visitors and total tourism revenue exceeding 10 billion yuan in 2023 and 2024 [2]