Change in fresh snow density in Tianshan Mountains,China |
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| Authors: | Xia Chen Wenshou Wei Mingzhe Liu |
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| Institution: | CHEN Xia1,2,WEI Wenshou3,LIU Mingzhe1,4 (1. Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China,2. Graduate University of Chinese Academy of Sciences,Beijing 100049,3. Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,4. Tianshan Station for Snow-cover and Avalanche Research,China) |
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| Abstract: | The fresh snow density was observed with snow analyzer (Snow Fork) at Tianshan Station for Snowcover and Avalanche Research,
Chinese Academy of Sciences from February 21 to March 5, 2009. Results show that fresh snow density increases from the 5th
h to the 291st h after the snowfall, with an average rate of increase of 4.0×10−4 g/(cm3·h) (R
2 = 0.943). Analysis shows that fresh snow density is negatively correlated with the compaction rate of fresh snow (R
2 = −0.960). Inversely, it is positively correlated with fresh snow viscosity (R
2 = 0.896). In relation to meteorological factors, ground temperature rising at a depth of 40 cm is the major driving factor
of snow density increase. The temperature increase in fresh snow layer and the decrease in depth hoar layer have the most
prominent impacts on the snow density increase in the afternoon. Principal component analysis shows that the determinant factors
of fresh snow density change can be grouped into 3 types as follows: 1) dynamic factor contributes about 69.71% to fresh snow
density change, with a significant effect from the 5th h to the 106th h after the snowfall; 2) exogenous energy factor contributes
about 20.91% to it, with a significant effect at the 130th h; and c) endogenous energy factor contributes about 9.38% to it,
with a significant effect at the 130th h and the 195th h. |
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| Keywords: | fresh snow density compaction rate energy conversion principal component analysis Tianshan Mountains China |
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