|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Variation of the thermal insulating properties of snow cover during the winter seasonтезисы доклада
- Авторы: Sokratov S.A., Barry R.G.
- Сборник: American Geophysical Union (AGU) 2000 Fall Meeting
- Серия: Eos, Transactions American Geophysical Union
- Том: 81
- Тезисы
- Год издания: 2000
- Место издания: American Geophysical Union
- Первая страница: H62G–09 (p. F446)
- Аннотация: For the present resolution and accuracy of climate models, snow depth and an effective heat conductivity of snow are the only characteristics involved in an estimation of the snow cover influence on the soil temperature regime. The effective heat conductivity of snow is low enough to expect that the snow cover always acts as a thermal insulator in the process of energy exchange between the underlying soil and the atmosphere. The effective heat conductivity depends on snow density, while the latter increases with an increase of snow depth. Data for 1958–1995 on the snow depth and the soil temperature at Irkutsk, Russia, was analyzed to estimate the effect of snow cover on temperature propagation into the soil. It was found that the intra-seasonal temperature change in the soil (at 20 cm depth) did not show any correlation with air temperature change in the early winter season. A correlation was observed for a snow depth exceeding some limiting value (20–25 cm) in mid-winter. The snow cover acted in the "expected'" manner (the higher the snow depth, the less the temperature change in the soil relative to that in the air) only in late winter. In the literature, the evolution of the snow cover properties is related to the recrystallization processes in the snow cover. The similarity of the snow cover evolution between years still allows us to represent the snow cover influence on soil temperature in models by the effective heat conductivity of snow. However, in characterizing the thermal insulation properties of snow cover, one has to consider not only the heat-flux dependence on snow density and depth, but also the change in the response of soil temperature to the snow cover over the course of the winter season. https://abstractsearch.agu.org/meetings/2000/FM/H62G-09.html
- Добавил в систему: Сократов Сергей Альфредович