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]

本数据集提供了全球21878个淡水湖泊在全时段（1980年代-2010年代）以及三个子时段（1980–1990年代、2000年代、2010年代）的最大蓝藻水华扩张面积（maximum bloom extent, MBE，单位：平方千米）与水华发生中位数（median bloom occurrence, BO，单位：百分比），相关数据基于1982至2019年的Landsat卫星观测生成。
BO的定义为某时段内检测到的蓝藻水华次数与有效卫星观测次数的比值，取值范围为0至100。蓝藻水华检测仅在全球地表水体（Global Surface Water Occurrence, GSWO）数据集中水体出现率大于95%的湖泊区域内进行，详细方法参见NG论文。
本数据集还提供了上述区域的汇总面积（对应列"V"）。由于三个子时段均设置了有效影像数量的最小阈值，以排除有效观测不足的区域参与统计（详细方法参见NG论文），因此部分湖泊可能在全时段拥有有效的MBE、BO与水体面积（Water Area, WA）数据，但在三个子时段中无对应数据。
数据集表格内容说明如下：列"A-U"为从HydroLAKES数据集编译得到的湖泊信息；列"V"为GSWO数据集中水体出现率达95%的湖泊水域面积；列"W-X"为全时段的MBE与BO数据；列"Y-AD"为三个子时段的MBE与BO数据。
如有任何疑问，请联系：[e-mail]