Reference:
Vasil'chuk Y.K., Bludushkina L.B., Budantseva N.A..
Experimental study of isotope composition of evaporating moisture from sandy soils
// Arctic and Antarctica. – 2018. – ¹ 4.
– P. 62-74.
DOI: 10.7256/2453-8922.2018.4.28589.
DOI: 10.7256/2453-8922.2018.4.28589
Read the article
Abstract: In this article the influence of drying temperature and dispersion of sandy soils on isotopic composition of water evaporated from soils is investigated. These studies are relevant for those permafrost areas, where sharply continental conditions with very warm summers and active evaporation. During evaporation water molecules with the lightest isotopes evaporate first, after then the molecules with more heavy isotopes evaporate. At high drying temperatures (180, 200, 220 °C) the isotopic composition of moisture categories in soils becomes heavier in the series: free water< transitional water < bound water. The effect of soil grain size on the isotopic composition of water evaporated from sands is more noticeable at lower temperatures, wherein the water vaporized from silty sand at the same temperature is isotopically heavier than water evaporated from medium-grained sand. For medium-grained sand portions of the condensate evaporated at a higher temperature have a heavier isotopic composition in δ18O and δ2H values, the same relationship is observed for silty sand in deuterium values, but the effect of temperature is less pronounced for silty sand in oxygen values.
Keywords: hydrogen isotope, oxygen isotope, isotopic composition, stable isotopes, evaporation temperature, water evaporation, soils, sand, laboratory experiment, permafrost
References:
Zimmermann U., Ehhalt D., Münnich K.O. Soil–water movement and evapotranspiration: changes in the isotopic composition of the water // Proc. Symp. Isot. Hydrol., Vienna, IAEA., 1967, p. 567–584.
Yepez E.A., Williams D.G., Scott R.L., Lin G. Partitioning overstory and understory evapotranspiration in a semiarid savanna woodland from the isotopic composition of water vapor // Agricultural and Forest Meteorology, 2003, vol. 119, iss. 1–2, p. 53–68.
Yakir D., Sternberg L. da S.L. The use of stable isotopes to study ecosystem gas exchange // Oecologia, 2000, vol. 123, p. 297–311.
Dansgaard W. Stable isotopes in precipitation // Tellus, 1964, vol. 16, N4, p. 436–468.
Gonfiantini R. Environmental isotopes in lake studies // Handbook of environmental isotope geochemistry, Vol. 3, P. Fritz and J. C. Fontes, eds., Elsevier, New York, 1986, p. 113–168.
Price J.S., Edwards T.W.D., Yi Y., Whittington P.N. Physical and isotopic characterization of evaporation from Sphagnum moss // Journal of Hydrology,