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The freshwater flux from the Greenland Ice Sheet (GrIS) to the NorthAtlantic Ocean carries extensive but poorly documented volumes of sediment.We develop a suspended sediment concentration (SSC) retrieval algorithmusing a large Greenland specific in situ data set. This algorithm is appliedto all cloud-free NASA Moderate Resolution Imaging Spectrometer (MODIS)Terra images from 2000 to 2012 to monitor SSC dynamics at six river plumesin three fjords in southwest Greenland. Melt-season mean plume SSC increasedat all but one site, although these trends were primarily not statisticallysignificant. Zones of sediment concentration  > 50 mg L<sup>−1</sup>expanded in three river plumes, with potential consequences for biologicalproductivity. The high SSC cores of sediment plumes ( > 250 mg L<sup>−1</sup> expanded in one-third of study locations. At a regional scale,higher volumes of runoff were associated with higher melt-season mean plumeSSC values, but this relationship did not hold for individual rivers. Highspatial variability between proximal plumes highlights the complex processesoperating in Greenland's glacio–fluvial–fjord systems

MODIS observed increase in duration and spatial extent of sediment plumes in Greenland fjords