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Unrealistic phytoplankton bloom trends in global lakes derived from Landsat measurements

Lian Feng,Xuejiao Hou,Junguo Liu,C. Zheng

Published 2020 in Unknown venue

ABSTRACT

Given its advantages for synoptic and large-scale observations, satellite remote sensing 9 has been widely used to effectively monitor the water quality of inland and coastal 10 environments. Using satellite-derived reflectance data from the Landsat 5 Thematic 11 Mapper (L5TM) as a proxy for algal bloom intensity, Ho et al. 1 showed an increase in 12 peak summertime bloom intensity in 68% of the 71 large lakes worldwide from 1982 13 to 2012. However, we question the veracity of their finding for at least two reasons: (1) 14 satellite-derived reflectance in a single near-infrared (NIR) band is not a reliable proxy 15 for bloom strength due to the strong impacts of suspended sediments and aquatic 16 vegetation, and (2) the infrequent satellite observations from L5TM (one cloud-free 17 image every 1-2 months) make it difficult to draw statistically meaningful conclusions. 18 Therefore, although it is natural to speculate that more blooms may be found in lakes 19 under changing climatic conditions, the work by Ho et al. 1 needs to be revisited before 20 reaching any solid conclusions. 21

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