排序方式： 共有83条查询结果，搜索用时 15 毫秒
41.
N. A. Kalinin A. V. Kislov E. D. Babina A. L. Vetrov 《Russian Meteorology and Hydrology》2010,35(10):659-664
The quality estimation of diurnal air temperature course reproduction by the hydrodynamical MM5 model in the Urals in July
is carried out by means of the comparison with the station observational data. The MM5 model reproduces the temperature maximums
better than the minimums which are considerably overestimated by the model. The highest accuracy of air temperature reproduction
is demonstrated by the model at 03:00, 06:00, 09:00, 12:00, and 24:00, whereas the lowest one, at 15:00, 18:00, and 21:00.
The correlation coefficients between the model and actual data vary from 0.74 at 21:00 to 0.87 at 09:00 and 12:00. The autocorrelation
functions computed for the actual and model data indicate that the MM5 model reproduces the temperature field with higher
quality than the technique based on the inertial properties of the atmosphere. 相似文献
42.
Kalinin D. V. Serdobintseva V. V. Eliseev A. P. Sobolev N. V. 《Doklady Earth Sciences》2009,427(2):1040-1042
Doklady Earth Sciences - 相似文献
43.
Yu.A. Kalinin K.R. Kovalev E.A. Naumov M.V. Kirillov 《Russian Geology and Geophysics》2009,50(3):174-187
A comparative analysis of morphology and geochemistry was made for gold from the primary ores and weathering crust of the Suzdal' gold deposit, Eastern Kazakhstan. The deposit is localized in Carboniferous carbonaceous-terrigenous strata and is of gold-sulfide type. Study of gold from primary ores showed that it occurs mainly in two species: free and so-called invisible. Free gold is crystallomorphic segregations and irregular-shaped grains up to tens of microns in size; it occurs in intergrowths with sulfides, quartz, carbonate, and mica-chlorite aggregate. Most of gold particles have a fineness of 930–980‰, with some grains showing wide variations in composition. Invisible gold (probably chemically combined) is present in fine-acicular arsenopyrite and, less frequently, pyrite.Being transported to the weathering crust, all this gold served as a source for “neogenic” gold of diverse morphologic forms. We recognized crystalline (isometric, prismatic, acicular, and tabular) particles and drusoid gold aggregates in the form of exotic intergrowths of crystallomorphic and sinter-shelly grains. The grains tend to coarsen from bottom to top of the weathering crust. Several generations of gold of different granulometric classes are observed. We have revealed seed and layer growth and dissolution structures in crystals of early generations overgrown with fine grains. All these gold varieties are associated with hypergene minerals. Most of this gold is of high fineness (on the average, 995‰). The hypergene gold particles are chemically homogeneous high-grade, without rims.The results of studies suggest that the high-grade hypergene gold formed in the weathering crust as a result of the dissolution of invisible gold of sulfides and its local redistribution and deposition in oxidizing media. This is also evidenced from the tendency of gold to coarsen from bottom to top of the weathering crust. A distinctive feature of secondary gold is well-expressed crystals and their great diversity. 相似文献
44.
Khazheeva Z. I. Urbazaeva S. D. Bodoev N. V. Radnaeva L. D. Kalinin Yu. O. 《Water Resources》2004,31(1):64-67
The overall concentration of Cu, Pb, Zn, Cr, Mn, and Fe are determined in the water and bottom sediments of the Selenga River delta. The concentration of Cu, Pb, and Zn is found to decrease in the lower course of the river, at the delta outlet. The concentration of Mn and Fe is found to decrease in the downstream direction from the river's upper course along the investigated delta arms, whereas the concentration of Zn and Cr in certain arms exceeds their concentration in the upper section of the delta. 相似文献
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47.
Soloviev S. G. Kryazhev S. G. Semenova D. V. Kalinin Y. A. Bortnikov N. S. 《Doklady Earth Sciences》2021,499(1):538-544
Doklady Earth Sciences - The isotopic U–Pb ages are estimated for zircons (for the first time by the LA–ICP–MS method) from biotite (Eldzhurty) granites and for the first time... 相似文献
48.
Soloviev S. G. Kryazhev S. G. Semenova D. V. Kalinin Yu. A. Kryazhev V. S. Emkuzhev M. S. Bortnikov N. S. 《Geology of Ore Deposits》2021,63(5):409-430
Geology of Ore Deposits - The authors' determinations of the U–Pb isotopic age of zircon (LA–ICP–MS method) in the main types of igneous rocks emphasize the presence of both... 相似文献
49.
Sergey V. Pyankov Andrey N. Shikhov Nikolay A. Kalinin Eugene M. Sviyazov 《地理学报(英文版)》2018,28(2):221-237
Coupled hydrological and atmospheric modeling is an efficient method for snowmelt runoff forecast in large basins. We use short-range precipitation forecasts of mesoscale atmospheric Weather Research and Forecasting (WRF) model combining them with ground-based and satellite observations for modeling snow accumulation and snowmelt processes in the Votkinsk reservoir basin (184,319 km2). The method is tested during three winter seasons (2012–2015). The MODIS-based vegetation map and leaf area index data are used to calculate the snowmelt intensity and snow evaporation in the studied basin. The GIS-based snow accumulation and snowmelt modeling provides a reliable and highly detailed spatial distribution for snow water equivalent (SWE) and snow-covered areas (SCA). The modelling results are validated by comparing actual and estimated SWE and SCA data. The actual SCA results are derived from MODIS satellite data. The algorithm for assessing the SCA by MODIS data (ATBD-MOD 10) has been adapted to a forest zone. In general, the proposed method provides satisfactory results for maximum SWE calculations. The calculation accuracy is slightly degraded during snowmelt periods. The SCA data is simulated with a higher reliability than the SWE data. The differences between the simulated and actual SWE may be explained by the overestimation of the WRF-simulated total precipitation and the unrepresentativeness of the SWE measurements (snow survey). 相似文献
50.
Analyzed is a phenomenon of the freezing rain observed in Perm krai on December 14, 2010, when the surface temperature was ?10.9°C. The process of cooling of falling drops is numerically simulated and their temperature is computed on the basis of the data of radio sounding of the atmosphere. It is demonstrated that the large-size drops do not have time to reach the supercooling state and, when falling to the ground, have a positive temperature. The finer drops are cooled to the negative temperature. An executed estimation of the process of transformation of falling drops into ice at the crystallization of the supercooled water demonstrated that the volume fraction of the ice crust of drops at the phase transition does not exceed 3% even under optimum cooling conditions. 相似文献