The research on transfer funcotion of the chemical constituents in snow layer

雪层化学成分传递函数研究

基本信息

批准号：
11480134
负责人：
WTANABE Okitsugu
金额：
$ 8.26万
依托单位：
Natiomal Institute of Polar Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11480134/
关键词：
snow layer oxygen isotope ratio chemical constituents transfer function temperature inclination in snow layer snow accumulation mechanism in polar region 慣例変態温暖変態層位構造同位体化学組成融解氷化

项目摘要

It is already reported that the chemical constituents concentration in the snow layer changes after accumulation in the polar region. However, it finds the cause of the concentration change hardly. We experimented in the reappearance at the laboratory to examine the diffusion processes of the chemical constituents. To do this experiment, we created the new equipment that can change a snow temperature. This equipment can lower the temperature of snow sample to -31℃, and can create the temperature inclination of 0.71℃. We collected snow samples from snow layers at the three regions, two points of Hokkaido and one of Nagano Prefecture because it was difficult to create snow blocks artificially to be used by the experiment in laboratory. Then we also observed stratigraphy, density and snow temperature to investigate the initial snow condition. The snow sample which was collected in Hokkaido was used for the first experiment. For about one week, this sample (density : 0.35〜0.37g/cm^3) set a temperature in the upper part to -20℃ and in the lower part to -30℃. After experiment, the concentration of chemical constituents in snow sample increased in the upper part and decreased in the lower part. And oxygen isotope ratio decreased in whole layers after experiment. It is possible that this change have occurred with the sublimation and condensation of snow grain.

已有报道称，极地地区积雪后，雪层中的化学成分浓度发生了变化，但我们在实验室中进行了再现实验，考察了化学成分的扩散过程，但很难找到浓度变化的原因。为了进行这个实验，我们创建了可以改变雪温度的新设备，该设备可以将雪样品的温度降低到-31℃，并且可以从雪层中采集0.71℃的温度倾斜度。三个地区、两个北海道和长野县的一个点，因为在实验室中人工制造雪块很难用于实验，然后我们还观察了地层、密度和雪温，以调查初始雪的状况。第一次实验使用北海道，该样品（密度：0.35〜0.37g/cm^3）将上部温度设置为-20℃，将下部温度设置为-20℃。 -30℃，实验后雪样中的化学成分浓度上部升高，下部降低，整个层的氧同位素比值降低，这种变化可能是随着升华和升华而发生的。雪粒的凝结。