Role of redistribution of snow mass in mass balance of Antarctic Ice Sheet

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(1)Compile of previous researches:Previous studies on drifting snow were compiled about dynamic mechanism of drifting snow particles, theoretical simulation of drifting snow, observation methods and wind-tunnel experiments about drifting snow.(2)Observations of snow particles on a snow surface:Snow blocks were sampled from the outer snow surface and set to the bottom of small wind-tunnel, by which threshold wind velocities for snow particles to drift were observed. Simultaneously the snow particles were fallen down in a pipe and the terminal velocities of particles were observed.The threshold velocities and terminal velocities had some relation depending of particle size and form. They were small for dendrite snow flakes and large for rimed snow flakes and melting particles.(3)Automatic Weather Station (AWS)AWSs were set on from coastal region to inland region and the acquired data were compiled up. The temperature rise on a ventilator by solar radiation was a problem of temperature observation. Several experiments were carried out to eliminate this temperature rise.(4)Redistribution of snow accumulation:Simulation of redistribution of snow accumulation on an ice sheet was done by estimating katabatic wind velocities and drift transport rate. The katabatic wind velocities depend on surface slope and temperature inversion, the relation of which were obtained from the AWS data and NCEP synoptic analysis data.