ABoVE: Lake Growing Season Green Surface Reflectance Trends, AK and Canada, 1984-2019

This dataset provides an annual time series of Landsat green surface reflectance and the derived annual trend during the growing season (June and July) for 472,890 lakes across the ABoVE Extended Study Domain from 1984 to 2019. The reflectance data are from Landsat-5, Landsat-7, and Landsat-8 sensors for the green band (center wavelength 560 nm). Over 270,000 Landsat scenes were evaluated and quality assured to be cloud-free and over water. Lakes were selected from HydroLAKES, a global database of lakes of at least 10 ha. Lake surface reflectance was extracted from a 3-by-3-pixel area centered on each lake centroid from the selected Landsat scenes determined from lake polygons. This dataset demonstrates changes in lake color over time in the arctic and boreal regions of North America. Color is relevant for understanding physical, ecological, and biogeochemical processes in some of the world’s highest concentrations of lakes where climate change may have significant impacts.

本数据集提供了一份涵盖1984年至2019年期间ABoVE扩展研究域内472,890个湖泊的年际时间序列数据，包括生长季节（六月和七月）内的Landsat绿色地表反射率及其派生的年度趋势。反射率数据源自Landsat-5、Landsat-7和Landsat-8传感器在绿色波段（中心波长为560纳米）的测量。超过270,000个Landsat影像经过评估和质控，确保无云且完全覆盖水面。湖泊数据来源于至少10公顷的全球湖泊数据库HydroLAKES。湖泊表面反射率通过从选定的Landsat影像中提取每个湖泊质心周围的3×3像素区域获得。该数据集展示了北美北极和温带地区湖泊颜色随时间的变化。颜色对于理解某些湖泊的物理、生态和生物地球化学过程至关重要，这些湖泊是全球湖泊密度最高的区域之一，气候变化可能对它们产生显著影响。