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Chemical Properties of Glacial and Ground Ice,, , P. 265–295статья
- Автор: Vasil'chuk Yu K.
- Сборник: Types and Properties of Water, Encyclopedia of Life Support Systems (EOLSS)
- Том: 2
- Глава в коллективной монографии
- Год издания: 2006
- Место издания: Developed under the Auspices of the UNESCO, Eolss Publishers Paris
- Первая страница: 265
- Последняя страница: 295
- Аннотация: Marine aerosols are the main source of Cl, Mg, Na, K, Mg, SO4, in ice sheets of Greenland and Antarctic. Marine salts accumulate along the coastline, their concentration decreases sharply away from the coastline. Concentration of elements of continental origin is independent on the distance from coastline. In Greenland dust concentrations in ice–age ice are 3 to 70 times those in Holocene ice. The ice–age dust contains a strong component of calcium carbonate. This neutralized acid aerosols in atmosphere so that in contrast to Holocene ice, nearly all ice–age ice is alkaline. Air clathrate hydrates are observed in deeper ice sheets. Mineralization of ground ice is an important indicator of ice origin; ground ices are classified according to their salinity. Ice with mineralization 0.02– 0.1 g/l is predominant in Holocene ice wedges of Northern Yakutia. The mineralization of Pleistocene ice wedges is 60 – 478 mg/l. Salt concentration ranges in dependence of distance from the sea. Most ice–wedge ice is fresh. Maximum concentration of heavy metals in Greenland ice cores Pb –151 pg/g, Cu – 238 pg/g, Zn – 644 pg/g, Cd – 3.0 pg/g and in Vostok ice core: Pb –38 pg/g, Cu – 33 pg/g, Zn – 101 pg/g, Cd – 3.0 pg/g. Because the δ18О composition of water infiltrating through the snow layer reflects the isotopic composition of the snow, the isotopic composition of modern ice wedges also corresponds with that of winter snow. For example, the mean values of δ18О composition of snow from three localities in the permafrost zone of Northern Eurasia are similar to or isotopically lighter than δ18О values in modern adjacent ice wedges. The isotope record of ice wedges is averaged oxygen isotope composition of snow precipitation for many years. The oxygen isotope composition of ice-wedge ice varies spatially along the northern coastline of Siberia and temporally during the last 40 ka. This indicates a dependence of the δ18О composition of ice wedges upon climatic conditions.
- Добавил в систему: Васильчук Юрий Кириллович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Vasilchuk_2006_CHEMICAL_PROPERTIES_OF_GLACIAL_AND_GROUND_IC… | Vasilchuk_2006_CHEMICAL_PROPERTIES_OF_GLACIAL_AND_GROUND_IC… | 504,1 КБ | 6 ноября 2016 [vasilchuk] | |
| 2. | Vasilchuk_2006_CHEMICAL_PROPERTIES_OF_GLACIAL_AND_GROUND_IC… | Vasilchuk_2006_CHEMICAL_PROPERTIES_OF_GLACIAL_AND_GROUND_IC… | 724,5 КБ | 6 ноября 2016 [vasilchuk] |