| Summary: | The Japanese Antarctic Research Expedition (JARE) has been conducting snow stakes observation between Syowa Station and Dome Fuji Station for more than 30 years. This observation has revealed interannual variations in the annual depth of accumulation. In order to clarify the cause of this interannual variation from field observation, it is necessary to know the date and time of the snow surface change and its magnitude. Therefore, we have installed four AWSs equipped with snow depth sensors from 2016 to 2019. This presentation shows the main results as follows: 1) The temporal changes of surface height include stepwise fluctuations and pulse-like fluctuations, and the rise in surface height is mainly caused by stepwise rises, rather than pulse-like fluctuations. The stepwise fluctuations are likely associated with synoptic-scale disturbances. The pulse-like fluctuations are concentrated more in cold season than warm season. 2) A slow decline in surface height was observed during the warm season. 3) The stepwise fluctuations in the inland plateau areas are concentrated more in warm season than cold season.
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