Abstract
Depth and rate of the soil freezing are stronly determined by dynamics of snow accumulation during the first half of a cold season. Dynamics of snow accumulation over two periods (1966–2000 and 2001–2010) was analyzed using data of snow surveys performed on the European part of Russia and in basins of rivers Ob and Yenisei (Siberia). The ratio a of snow cover thickness measured for the first half of the cold season (untill January 1 st ) to the maximal thickness for the whole period is taken as a characteristic of the snow accumulation dynamics. Maps of the ratio a on the above areas had been constructed. During the last period (2001–2010) values of this ratio increased by 10–20% in regions to the East of the Lena river, and they decreased by 15–40% in the European part of Russia and in basins of rivers Ob and Yenisei. Model calculations did show that differences in the soil freezing depths under different conditions of the snow cover growth sometimes exceeded 50%. Interannual variability of the snow thermal resistance and the snow cover influence.
Highlights
Depth and rate of the soil freezing are stronly determined by dynamics of snow accumulation during the first half of a cold season
Model calculations did show that differences in the soil freezing depths under different conditions of the snow cover growth sometimes exceeded 50%
Interannual variability of the snow cover thermal resistance is presented
Summary
Минимальную темпе максимальную толщину ратуру воздуха τTmin снежного покрова τhmax при толщине снежного покрова hmax, см. 1. При минимальной температуре воз духа на момент времени τTmin = 140 (70)‐е сутки и естественном ходе снегонакопления, когда максимальное значение толщины снежного по крова hmax = 90 см приходится на конец зимы (τhmax = 210 сут.), максимальная глубина промер зания составит ξmax = 1,25 (1,42) м. При естественном распределении темпе ратуры воздуха (τTmin = 140 сут.) и наибольшей толщине снежного покрова в конце холодно го периода глубина промерзания для снежного покрова толщиной 90 и 45 см равнялась 1,25 и 1,76 м соответственно. Если основное количе ство твёрдых осадков выпадет в первой полови не зимы, то увеличивается среднее термическое сопротивление снежного покрова и уменьшает ся глубина промерзания на 29 и 34% при толщи не снега hmax равной 90 и 45 см соответственно. В южных районах ЕТР в отдельные годы отрицательные температуры устанавлива ются после декабря
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