9:30 AM - 9:45 AM
[ACC26-03] Snow modification due to climate change in southeastern high-accumulation area of Greenland over the last 60 years evaluated by physical properties of firn core.
Keywords:Greenland, physical property, near-infrared reflectance , firn, snow grain, albedo
Density and NIR data from the SE-Dome ice core are negatively correlated in the long-term trend. These negative correlations show SSA values basically decrease with snow densification. On the other hand, there is positive correlation between density and NIR data in the short-time trend. Both density and NIR of summer samples particularly tend to be lower value than those of samples deposited during other seasons in same year. Timing and number of the low-SSA and low-density layers are related to those of the periods in which air temperature reaching over -5 ℃ continued. This relationship shows the formation of low-SSA and low-density layers enhanced even though air temperature was less than 0℃. The low-SSA and low-density layers are caused by density reduction due to snow sublimation on the surface of ice sheet.