I scanned now through the spectrum to see how broad this "recent bump" is and it extends very roughly (each loading for a frequency takes quite long) from 650-950nm, so it looks on a first sight that also a water absorption band would lie in this region: solar spectrum. On a rough glimpse the irradiance rise is around 0.008 that is at 947.35nm it raises from 0.816 to 0.824 W/m^2 nm, so if we assume 2 is 100% this is about 0.4%. I find that a lot, but I have absolutely no feeling how this translates to effects on earth.