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FigA1.epsPS document106KGeographic distribution of mixed-layer depth (MLD, top panels), and mixed-layer salinity (bottom panels) observed in 2011 (left), 2008 (center) and 2001 (right). The MLD was determined using the density criteria sigma> 0.1 from the 10 m value. While the upper ocean properties in 2001 were more similar to 2011 than to 2008, there was a significant freshening of the upper ocean in 2011 and shallower mixed layers were observed, particularly East of the former position of the Mertz Glacier Tongue (see Figure 1 in the main text).
FigA2.epsPS document25KHistograms of mixed layer depth (MLD, top panels) and mixed-layer salinity (bottom panels) observed in 2011 (left), 2008 (center) and 2001 (right). The red line indicates the median (see Table 1 in the main text).
FigA3.jpgJPEG image690KPhotographs of the seafloor were taken by Geoscience Australia at several stations at depths of 400-1000m, using a camera fitted to the CTD. This photograph was taken at a depth of 550 m beneath the surface phytoplankton bloom east of the former position of the Mertz Glacier Tongue (see the station marked with a star in Figure 1c in the main text). The distance between the two red laser dots is 50 cm. Most of the sea floor is covered with a thick mat of diatoms that have sunk from the surface layer (green-brown material). Halos around the benthic organisms (holothurians) have formed due to the organisms sweeping their surrounds of organic matter. Samples taken at selected depths in Niskin bottles were concentrated by filtration using 0.8μm pore size polycarbonate filters ay 3.5 C and examined using a Zeiss Axioskop fitted with differential interference contrast optics for species identification.
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