Fig. 7: Field spectral data from the Robert Island ice cap (South Shetland Islands, maritime Antarctic).
From: Surface darkening by abundant and diverse algae on an Antarctic ice cap
a Hemispherical directional reflectance factors (HDRF) for cryoflora on the Robert Island ice cap. Spectra with Ancylonema present are shown with solid red line, red cell dominated spectra shown with red dashed line, clean snow with no visible algae or dust with solid blue line, weathering snow crust with solid black line. Colour scale shows cell density (cells ml−1). b Instantaneous radiative forcing (IRF W/m2) compared with cell density (cells/ml) for the samples with Ancylonema present (diamond) and red pigment-producing cryoflora (circle) observed on the Robert Island ice cap.
