排序方式： 共有8条查询结果，搜索用时 31 毫秒
1
1.
Natural Hazards - Large-scale wildfires and windstorms are the most important disturbance agents for the Russian boreal forests. The paper presents an assessment of fire-related and wind-induced... 相似文献
2.
Yu. V. Barkhatov A. A. Tikhomirov S. A. Ushakova V. N. Shikhov S. I. Bartsev A. G. Degermendzhi 《Doklady Earth Sciences》2016,471(1):1168-1170
A sealed vegetation chamber was designed and constructed for physical simulation of climate conditions in the Subarctic zone during the spring–summer time. The small laboratory tundra-simulating ecosystem (TSE) was created for comparative evaluation of the rates of soil respiration and of the total balance of carbon fluxes in tundra ecosystems. The test experiment was performed to study the TSE response to a temperature rise in air and soil by 2°C in terms of the intensity of the СО2 flux. It was shown that this increase in temperature would cause a pronounced shift in the balance of СО2 production and utilization in the ecosystem from near-zero values to a stable generation of 24 μmol/h of CO2 per 1 kg of dry biomass. 相似文献
3.
Barkhatov Yu. V. Ushakova S. A. Shikhov V. N. Evgrafova S. Yu. Tikhomirov A. A. Degermendzhi A. G. 《Doklady Earth Sciences》2018,483(2):1539-1541
Doklady Earth Sciences - Laboratory experiments were conducted in a hermetically sealed growth chamber with two soil samples obtained from the arctic tundra zone with different levels of moisture.... 相似文献
4.
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
5.
6.
A procedure for computing the parameters of internal and swell waves based on the radiopanorama of the sea surface obtained from on board a ship in the side-looking regime using the dispersion equation is suggested. Compared with the procedure of ref. 1, it simplifies the methods of measurements. Specific examples of computing the swell and internal wave parameters using radiopanoramas of the sea surface are considered which support the efficiency of the procedure suggested.Translated by Mikhail M. Trufanov. 相似文献
7.
The results are presented ofmodeling the formation and evolution ofmesoscale convective systems (MCS) accompanied by severe weather events over the territory of the Western Urals by the WRF-ARW numerical model of the atmosphere. Twenty-three cases of mesoscale convective complexes and mesoscale squall lines are considered for 2002-2015. The Terra/Aqua MODIS data, the data of weather radars installed in Perm and Izhevsk, and the data from the Roshydromet observation network were used to verify the model forecasts. It is demonstrated that the parameters of MCS intensity are simulated by the model with high reliability; however, the quality of the forecast of the spatial position of MCS is unsatisfactory in most cases. It is revealed that the model grid spacing strongly affects the forecast skill scores. In some cases the model successfully simulates the formation and evolution of MCS accompanied by severe weather events and can be used for their short-range forecast with the time accuracy of ±(1-2) hours. 相似文献
8.
N. A. Kalinin A. L. Vetrov E. V. Pishchal’nikova E. M. Sviyazov A. N. Shikhov 《Russian Meteorology and Hydrology》2016,41(3):193-198
The results of the forecast of two heavy snowfalls registered on October 18 and 23, 2014 in the Urals using the WRF model are presented. The application of the WRF-ARW atmospheric model to the computation of weather forecasts for the conditions of heavy widespread precipitation in the form of snow is considered. The obtained estimates of precipitation forecast are compared with the estimates of the GFS NCEP global model. The results demonstrate that both models have approximately the same accuracy of precipitation forecast in the context of the process under consideration. 相似文献
1