IKBFU's Vestnik

2014 Issue №1

The characteristics of the energy spectrum of mixture ratio and air temperature in the troposphere of the Antarctic

Abstract

This article analyses the characteristics of the energy spectrum of mixture ratio and air temperature in the troposphere of the Antarctic obtained by Fourier analysis. Selected peaks of spectral density of mixing ratio and air temperature monthly averages are interpreted as annual and semi-annual fluctuations. The spectral density of random function is considered as the energy spectrum of functions. It is shown that activity zones are present in the troposphere of the Antarctic.

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Climate change in the mountainous regions of the Republic of Tyva: The case of the Bay-Tayginsk district

Abstract

The most considerable increase in the temperature of soil surface was observed in the cold period (1,5 °С, a 53,9% rise in temperature), the smallest in August (0,3 °С, 2,1 %), whereas, in May-June, the increase was negative (–1,3 °С, 27,1 %). Major increases in air temperature take place in April-July, September, and October (68,8 %), summer and winter accounted for 35,0 % and 29,9 % respectively. Soil surface and air temperature increased by 1,7ºС. In the warm period, air temperature is lower than soil surface temperature; in the cold period, on the contrary, it is higher. The air temperature increase is 33% lower than that of soil surface.

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An assessment of drought conditions in Ukraine in the end of the 20th the beginning of the 21st centuries

Abstract

The drought conditions in the 1995—2012 vegetation period in Ukraine are estimated using the fields of Selyaninov hydrothermal coefficient (SHC). The analog method helps identify the most probable seasonal and monthly SHC fields. The lowest SHC values are observed in the steppe regions and Crimea. Frequency of drought months reaches 60—70 % in the southern regions. The most severe seasonal droughts occurred in 2007 and 2009 with a spread area of over 35 % of the country’s territory.

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