Water chemical composition in the salt lakes of the Ubsunur depression (Southeastern Tuva)

Presented are the results from determining the principal ion composition of the waters and the composition of chemical elements, including rare and rare-earth elements) in the waters of three salt lakes: Shara-Nur, Dus-Khol and Bai-Khol, on the territory of the drainless Ubsunur depression. Common to these lakes are their small depth, and their location in the bottoms of basins without outflow, between small bald mountains in the zone of dry climate with abrupt temperature fluctuations. More likely these lakes have their origins in the remnants of ancient water basins. Accumulation of salts in the lakes is associated with continental salinization processes.     

Effects of changes in the hydrological and hydrochemical regime of the Caspian Sea on the development of microalgae in the coastal zone

This paper analyzes the composition and distribution of coastal phytoplankton in the western portion of the Middle Caspian in the context of changes in the hydrological and hydrochemical regime under the conditions of the rising level of the Caspian Sea. It has been demonstrated that the changes in the water regime led to an increase in the taxonomic diversity, the quantitative characteristics of phytoplankton, and the succession of the size groups.     

Influence of water suspension dispersibility on the toxicity of Lake Ladoga blooming

Doklady Earth Sciences -     

Impact of wildfire in Russia between 1998–2010 on ecosystems and the global carbon budget

Verified estimates of wildfire area and related carbon emissions in territories of Russia are reported for the period of 1998–2010. It is shown that the average burnt area is estimated to be at 8.23 million hectares per year (uncertainty ±9.0%, confidence interval 0.9), and carbon emissions—121 Tg C yr⁻¹ (±23%), with a significant interannual variability of these indicators. A quantitative characteristic of fire emissions by species is reported. Forests are a source of three quarters of all carbon emissions caused by wildfires. A significant acceleration of fire regimes is expected during the 21st century as a result of climate change in the country.     

长牡蛎繁殖周期、生化成分的季节变化与环境因子的关系

为了阐明长牡蛎的繁殖策略,自2004年3月—2005年2月对乳山湾养殖海区的环境因子(水温、盐度、叶绿素a含量)、长牡蛎繁殖周期及其生化成分(糖原、脂肪、蛋白质、RNA/DNA比值)的季节变化进行研究。结果显示,水温在一年中呈现显著变化,夏季水温最高,最高值为29.5℃(8月),冬季水温最低,最低值为1.8℃(1月);盐度在夏季雨水较多的时候略有降低;叶绿素a含量在夏末秋初(8月和9月)和春季(4月)有2个峰值,冬季最低。长牡蛎的繁殖周期分为冬季的休止期和从春季到夏季的繁殖期,在长牡蛎的繁殖期,条件指数逐渐下降到最低值,表明繁殖期长牡蛎生长变慢。在长牡蛎的配子发生过程中软体部蛋白质和脂肪含量略有上升,而糖原含量显著下降,表明长牡蛎配子的发生需要储存的糖原提供能量;RNA/DNA比值在配子发生过程中逐渐升高,显示RNA/DNA比值可以作为一个指标来指示长牡蛎的性成熟。配子发生过程中,长牡蛎的灰分含量逐渐升高,表明长牡蛎通过分解自身的贮能物质提供能量,使体内有机物含量减少,从而导致灰分含量上升。实验结果表明长牡蛎的配子发生类型为保守种。     

Scalar-tensor bimetric theory of gravitation. I

Institute of Applied Physics Problems, Armenian Academy of Sciences. Translated from Astrofizika, Vol. 32, No. 3, pp. 491–500, May–June, 1990.     

Fine structure of motions in a quiescent prominence

The Ca⁺ K line of the quiescent prominence of 15 October 1969 observed at the Abastumani Astrophysical Observatory of the Academy of Sciences of Georgia, U.S.S.R. is studied in detail. The behaviour of various fragments of the prominence with the line-of-sight Doppler velocities is investigated for different places of the prominence along the spectrum height. Due to superposition of the fragments and the radial velocities a complex non-gaussian profile of the spectral line is formed. Decomposition of the non-gaussian profile into suitable gaussian ones is made with a computer yielding objectivity and high accuracy. The rms error for the intensities in the decomposition is about 5%.It is found that the components into which the Ca⁺ K line decomposes at each level, are traced while proceeding from one photometric section to another throughout the spectral height.A hypothesis on the preferably filamentary structure of the prominence is put forward.     

Spectral study of the flare star EV Lac

Spectral observations of the flare star EV Lac made on the 2.6-m telescope at the Byurakan Observatory in 2000–2002 are reported. A powerful flare was detected and it was possible to follow the variation in the equivalent widths of the Hα and Hβ lines, both during the flare and during the quiescent phase of the star. It is shown that the profiles and equivalent widths of the lines underwent substantial changes. The equivalent widths of these emission lines reached a maximum roughly 40 min after the flare maximum. __________ Translated from Astrofizika, Vol. 49, No. 4, pp. 573–583 (November 2006).