Fig. 4: Seasonal evolution of water properties at CDP.
From: Warm surface waters increase Antarctic ice shelf melt and delay dense water formation
a Oxygen isotope ratio (black) and glacial melt water fraction (blue) in 2017, which was derived from three-point endmember method. b, c are seven-day running mean timeseries of salinity and temperature at 164 m depth in 2017 (red) and 2019 (purple). Broken line at 34.5 in b denotes the salinity criteria of DSW, and that at −1.87 °C in c denotes the freezing point temperature at a reference salinity in autumn. d, e are the time-depth plots for temperature (color shade) during the period of onset of freezing indicated in c, obtained from the mooring platforms. Data points are shown by scatters. White contour corresponds to the isotherm of −1.87 °C as a reference temperature. The location of the measurements is indicated by the white cross in Fig. 3e.
