[A-CC25] Glaciology

[ACC25-P08] Observation study for snow falling-deposition process

*Takahiro Tanabe¹ (1.National Research Institute for Earth Science and Disaster Resilience)

Keywords:Falling snow, Snowpack

Since snowpack is formed by deposition of falling snow particles, investigating how it falls and deposits is the basis for thinking about snow and ice phenomena derived from snow. In particular, numerical snowpack models such as SNOWPACK (Bartlet and Lehning, 2002) are used to predict snow and ice disasters, and the snow falling-deposition process is the initial value of the model, therefore, the understanding of this process is also important from the viewpoint of disaster prediction. The purpose of this study is to understand and model the process of snowfall to snowpack through observation.
In relatively warm snowy regions in Japan, such as the southern Tohoku and Hokuriku areas, snow depth decreases rapidly due to melting and compaction even in severe winters, so it is difficult to determine the depth of newly-fallen snow from the difference in snow depth. With regard to fresh snow, there have been reports on the regression equations for density and compressive viscosity of fresh snow as functions of typical snow crystal and weather conditions from observations using a snow accumulation board (Kajikawa et al., 2004; Goto et al., 2005). In this study, the observation using the boards was carried out in the same way as the previous study. In order to focus on the compaction process of fresh snow, we prepared several snow boards and observed them at different times. In the presentation, some observation examples will be introduced.

References
Bartelt, P., and Lehning, M. (2002), Cold Regions Science and Technology, 35(3), 123-145.
Goto, H., Kajikawa, M., Hashimoto, M., Goto, N., and Kikuchi, K. (2005) Seppyo, 67(4), 331-340. written in Japanese with English abstract.
Kajikawa, M., Goto, H., Kaneya, A., and Kikuchi, K. (2004) Seppyo, 66(5), 561-565. written in Japanese with English abstract.