Medium-range forecasting of the extent of forest fire hazard from meteorological conditions

A new method of medium-range forecasting of a class of fire hazard is developed based on more precise accounting of accumulated moisture deficiency that is reflected by the Nesterov standard index. A physico-statistical interpretation of hydrodynamic forecasts of fields of meteorological variables is used for finding of prognostic values of the elements of the fire hazard index, using forecasts of maximum air temperature and precipitation in the Novosibirsk region from the earlier developed scheme. The initial set of variables contains data on the isobaric surface geopotential at 500 hPa, surface pressure, temperature at 850 hPa at the regular grid points at 2.5° × 2.5° resolution and their derivatives. For formulation of forecasting equations, the algorithm of model self-organization is used with external criteria. The input of initial information, forecast issuance, displaying results and their delivery to customers based on GIS-technologies are totally automated.     

Time Variations in the Composition of Atmospheric Aerosol in Moscow in Spring 2020

Izvestiya, Atmospheric and Oceanic Physics - The results of an intensive complex experiment carried out from March 25 to May 3, 2020, to study the composition and time variability of urban aerosol...     

Atmospheric Loading Displacements

Izvestiya, Atmospheric and Oceanic Physics - A method for calculating of the Earth’s surface displacements due to atmospheric loading effect is presented. The load displacements are...     

Evidence for the volcanoclastic genesis of the Carnian diamondiferous bed in the Ust’-Olenek area (from petrographic and geochemical data)

A detailed petrographic study of a 0.4–1.2 m thick Carnian diamondiferous bed of the Angardam-Tasa Ridge (Ust’-Olenek area, northern Siberia) was performed. It showed that the bed earlier referred to as a terrigenous deposit might be interpreted as an intensely altered volcanoclastic lapilli tuff of basic and, probably, ultrabasic composition. The tuff occurs within a 100 m thick Ladinian–Carnian volcanosedimentary sequence. It consists mainly of resurgent material: altered lithoclasts (nodules of basic-ultrabasic? lithology), devitrified volcanic glass, fragments of autolithic breccia, etc. The thin volcanoclastic sheet is supposed to have formed within a sedimentation basin as a result of phreatomagmatic eruptions of kimberlite volcanoes. The substantiation of the volcanogenic origin of the Carnian diamondiferous bed might be a new approach to elucidate the primary source of widespread placer diamonds in Arctic Siberia.     

Air Temperature and Black Carbon Concentration in the Surface Atmosphere at Tiksi,Yakutia

Izvestiya, Atmospheric and Oceanic Physics - Temporal variations of the black carbon (BC) concentration and air temperature measured in the surface atmosphere at the Tiksi Hydrometeorological...