Comparison of methods for argo drifters data assimilation into a hydrodynamical model of the ocean     

K. P. Belyaev  C. A. S. Tanajura  N. P. Tuchkova 《Oceanology》2012,52(5):593-603

Different data assimilation methods such as an extended Kalman filter, the optimal interpolation method, and a method based on the Fokker-Planck equation applications are considered. Data from the ARGO drifters are assimilated into the HYCOM shallow water model (University of Miami, USA). Throughout the study, the schemes and methods of parallel computations with an MPI library are used. The results of the computations with assimilations are compared between themselves and with independent observations. The method based on the Fokker-Planck equation and the extended Kalman filter are preferable because they give better results than the optimal interpolation scheme. The various model characteristics of the ocean, such as the heat content fields and others, are analyzed after the data assimilation.  相似文献   

Disturbances of the topside ionosphere caused by typhoons     

N. V. Isaev  V. M. Kostin  G. G. Belyaev  O. Ya. Ovcharenko  E. P. Trushkina 《Geomagnetism and Aeronomy》2010,50(2):243-255

The measurements on board the Cosmos-1809 satellite of various parameters of the topside ionosphere plasma during more than ten typhoons in various regions are analyzed. It is shown that specific zones of increased pressure of the electron gas, electric field, and intense ion oscillations are formed during the intensification stage. In some cases the “typhoon eye” is formed over the tropical depression zone in the ionosphere, that is, the region with sharply decreased plasma density and pressure is observed a day and more prior to the moment when it happens in the atmosphere.  相似文献   

Geochemical features of metabasite inclusions in gray gneisses of the Baidarik block (Central Mongolia)     

V.A. Belyaev  M.A. Gornova  A.Ya. Medvedev  N.N. Pakhomova 《Russian Geology and Geophysics》2012,53(4):321-333

The Baidarik block of the Dzavhan microcontinent (Central Asian Fold Belt) includes the Upper Archean Baidaragin gray-gneiss complex. Among gray plagiogneisses, there are metabasic bodies, which are probably relics of early volcanics. By composition, the metabasites are divided into three petrochemical groups, whose protoliths were tholeiitic basalts, Al-undepleted and Al-depleted basaltic komatiites. Only a few samples are similar in REE composition to these protoliths. We have found metabasites with crustal-contamination features. The unusual geochemical properties of the metabasites (LREE enrichment and Nb, Zr, and Ti depletion) are related to their metasomatism.  相似文献   

Geochemical Typing of Organic Matter in the Bottom Sediments Based on the Molecular Composition of Saturated Aliphatic Hydrocarbons     

Ulyantsev  A. S.  Prokuda  N. A.  Streltzova  E. A.  Belyaev  N. A.  Romankevich  E. A. 《Oceanology》2021,61(5):727-735

Oceanology - The paper presents approaches to typing organic matter (OM) from bottom sediments based on molecular indicators and statistical analysis. The results of analyzing the molecular...  相似文献   

Transformation of suspended particulate matter into sediment in the Kara Sea in September of 2011     

A. Yu. Lein  P. N. Makkaveev  A. S. Savvichev  M. D. Kravchishina  N. A. Belyaev  O. M. Dara  M. S. Ponyaev  E. E. Zakharova  A. G. Rozanov  M. V. Ivanov  M. V. Flint 《Oceanology》2013,53(5):570-606

The biogeochemical processes participating in the transformation of the particulate matter into sediment along the Yenisei River-St. Anna Trough (Kara Sea) meridional profile were studied using hydrochemical, geochemical, microbiological, radioisotope, and isotope methods. The water-sediment contact zone consists of three subzones: the suprabottom water, the fluffy layer, and the surface sediment. The total number, biomass, and integral activity of the microorganisms (dark ¹⁴CO₂ assimilation) in the fluffy layer are usually higher than in the suprabottom water and sediment. The fluffy layer shows a decrease in the oxygen content and the growth of the dissolved biogenic elements. It was provided by the particulate organic matter supporting the vital activity of the heterotrophs from the overlying water column and by the flux of reduced compounds (NH₄, H₂S, CH₄, Fe²⁺, Mn²⁺, and others) from the underlying sediments. The C_org isotopic composition of the fluffy layer and the sediments is 2–4 ‰ heavier than that of the particulate matter and sediment due to the presence of the isotopically heavy biomass of microorganisms. A change in the isotopic composition of the C_org in the fluffy layer and surface sediment as compared to the C_org of the particulate matter is a widespread phenomenon in the Arctic shelf seas and proves the leading role of microorganisms in the transformation of the particulate matter into sediment.  相似文献   

Underthrusting of Tarim beneath the Tien Shan and deep structure of their junction zone: Main results of seismic experiment along MANAS Profile Kashgar-Song-Köl     

V. I. Makarov  D. V. Alekseev  V. Yu. Batalev  E. A. Bataleva  I. V. Belyaev  V. D. Bragin  N. T. Dergunov  N. N. Efimova  M. G. Leonov  L. M. Munirova  A. D. Pavlenkin  S. Roecker  Yu. V. Roslov  A. K. Rybin  G. G. Shchelochkov 《Geotectonics》2010,44(2):102-126

The results of reflection CMP seismic profiling of the Central Tien Shan in the meridional tract 75–76° E from Lake Song-Köl in Kyrgyzstan to the town of Kashgar in China are considered. The seismic section demonstrating complex heterogeneous structure of the Earth’s crust and reflecting its near-horizontal delamination with vertical and inclined zones of compositional and structural differentiation was constructed from processing of initial data of reflection CMP seismic profiling, earthquake converted-wave method (ECWM), and seismic tomography. The most important is the large zone of underthrusting of the Tarim Massif beneath the Tien Shan.  相似文献