Global lake algal bloom dataset with a paper published in Nature Geoscience, titled “Global mapping reveals increase in lacustrine algal blooms over the past decade" https://www.nature.com/articles/s41561-021-00887-x

This dataset provides maximum bloom extent (MBE, in km²) and median bloom occurrence (BO, in %) for 21,878 freshwater lakes worldwide in the entire period (1980s-2010s) and three sub-periods (1980–1990s, 2000s, and 2010s), which was generated using Landsat satellite observation between 1982 to 2019. The BO is defined as the ratio between the number of detected algal blooms to the number of valid satellite observations within a period, ranging from 0 to 100. Algal bloom detection was performed within a lake where the water occurrence is &gt;95% in the GSWO dataset (refer to the NG paper for details). The summarized areas of these regions were also provided (Column “V”). Because the minimum thresholds of valid image number in three sub-periods were used to exclude areas with insufficient valid observations from the statistics (details refer to the NG paper), some lakes may have valid MBE, BO, and WA in the entire period but have no data in three sub-periods. Contents of the table: Column “A-U”, lake information compiled from the HydroLAKES dataset. Column “V”, lake water area with 95% water occurrence in GSWO dataset. Column “W-X”, MBE and BO in the entire period. Column “Y-AD”, MBE and BO in three sub-periods.<br>If you have any questions,feel free to contect: [e-mail]

本数据集涵盖全球21878个淡水湖泊在全时段（1980年代-2010年代）及三个子时段（1980–1990年代、2000年代、2010年代）的最大藻华覆盖范围（maximum bloom extent, MBE，单位：平方千米）与藻华发生中位数频率（median bloom occurrence, BO，单位：百分比），数据集基于1982至2019年的陆地卫星（Landsat）观测数据生成。
藻华发生频率BO的定义为：某一时段内检测到的藻华次数与同期有效卫星观测次数的比值，取值范围为0至100。
藻华检测仅针对全球地表水体发生数据集（Global Surface Water Occurrence, GSWO）中水体发生比例大于95%的湖泊，详细方法参见NG论文。
本数据集同时提供上述湖泊的汇总水域面积（对应表格V列）。由于三个子时段均设置了有效影像数量的最小阈值，以剔除有效观测不足的区域（详细规则参见NG论文），因此部分湖泊在全时段拥有有效的MBE、BO及水域面积数据，但在三个子时段中无对应数据。
表格字段说明如下：列"A-U"：源自HydroLAKES数据集的湖泊基础信息；列"V"：GSWO数据集中水体发生比例达95%的湖泊水域面积；列"W-X"：全时段的MBE与BO数据；列"Y-AD"：三个子时段的MBE与BO数据。
如有任何疑问，欢迎联系：[e-mail]