First results on determination of chlorophill <Emphasis Type="Italic">A</Emphasis> and its derivatives in the system of trapped sedimentary material–fluffy layer–bottom sediment of the Caspian Sea     

M. D. Kravchishina  A. P. Lisitzin  A. Yu. Lein  V. N. Lukashin  A. N. Novigatsky  A. A. Klyuvitkin 《Doklady Earth Sciences》2016,467(1):284-288

The first data were obtained on the vertical chlorin flux in the water column and its accumulation in the upper layer of sediments of the Caspian Sea. Seasonal variability of the chlorine concentration in sedimentary matter was evaluated. The tendency of decrease in the phytoplankton-synthesized (allochtonous) organic matter content was revealed over approximately the past 60 years.  相似文献   

Detachment folding in a Lower Cambrian–Upper Permian karst reservoir: 3D model of the Yubei 3D area (eastern Markit Slope,Tarim Basin,Northwest China)     

JiuMei Li  LiangJie Tang  Yong Yue  Meng Li  ShengLong Zhang  Yu Long  ShaoHui Luo 《Arabian Journal of Geosciences》2016,9(14):630

A three-dimensional (3D) structural modeling of the Lower Cambrian–Upper Permian Yubei 3D area was performed to understand its structural evolution. This model reproduces the present-day structure of the basin and comprises 11 horizons within Lower Cambrian to Upper Permian rocks. The analysis is based on 3D depth views and faults. The results image salt movements due to tectonics and/or burial. From these observations, this paper deduces that salt structures are correlated to the main faults and tectonic events. From the model analysis, we interpret the timing and geometry of Tarim Basin tectonics. The fault geometry can be resolved based on the strike of the fault, the morphology of hanging wall strata, and the stratigraphic distribution. Emphasis is placed on gypsum rock detachment, considering its movements during the Middle Caledonian event and decoupling effects during tectonic evolution. Moreover, we point to the structural control of the Paleozoic basement and the crustal architecture (Yubei 3D Zone) on the geometry of the Tarim Basin.  相似文献   

Results of test experiment comparing measurement data of three adjacent ADCP bottom stations     

V. B. Piotukh  V. I. Baranov  S. B. Kuklev  O. I. Podymov 《Oceanology》2016,56(4):601-613

The results of a test experiment comparing quasi-synchronous data of three adjacent acoustic Doppler current profilers (ADCPs) deployed on the shelf bottom of the Black Sea in September 2014 are considered. The direct aim of the experiment was quantitative comparison of data from different ADCPs placed in maximally similar conditions to simultaneously measure the sea current parameters at one geographic point. The goals and the scheme of the experiment, methods for processing the measurement results, main results, and their interpretations and analysis, including practical results and conclusions, are described.  相似文献   

Macrophytobenthos of the Caspian Sea: Diversity,distribution, and productivity     

O. V. Stepanian 《Oceanology》2016,56(3):395-405

In the Russian sector of the northern and middle Caspian Sea, 36 species of macroalgae have been identified. The green and red algae from the mesosaprobic group are dominant. An increase in the number of green algae species is revealed. The distribution of macroalgae is inhomogeneous. It is confined to the solid substrate and epiphyton. The biomass of seaweeds reaches 1.5 kg/m². Climate change has little influence on the appearance of new species in the northern Caspian Sea, but new invaders can appear in the Middle and Southern Caspian. The distribution of aquatic and coastal hygrophytic vegetation shows considerable spatial dynamics due to fluctuations in the level and salinity of the Caspian Sea. The biomass of aquatic vegetation varies in a wide range from 0.5 to 10.0 kg/m₂. Spatially detailed mathematical models adequately reflect the changes in key species of aquatic plants in space and time. It is shown that expansion of the zone of the seagrass Zostera noltii to shallow water areas is occurring at present, as well as shrinkage of the range of the dominant littoral aquatic plant Phragmites australis.  相似文献   

Study of the contourite systems of the west Atlantic in the 50th cruise of research vessel <Emphasis Type="Italic">Akademik Ioffe</Emphasis>     

E. V. Ivanova  I. O. Murdmaa  D. G. Borisov  E. A. Seitkalieva  L. D. Bashirova  E. A. Ovsepyan  E. V. Bulycheva  N. V. Simagin  A. V. Krek  D. T. Fidaev 《Oceanology》2016,56(6):888-889

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Variations of the aerosol concentration and chemical composition over the arid steppe zone of Southern Russia in summer     

M. S. Artamonova  D. P. Gubanova  M. A. Iordanskii  V. A. Lebedev  L. O. Maksimenkov  V. M. Minashkin  Y. I. Obvintsev  O. G. Chketiani 《Izvestiya Atmospheric and Oceanic Physics》2016,52(8):769-783

Variations in the surface aerosol over the arid steppe zone of Southern Russia have been measured. The parameters of atmospheric aerosol (mass concentration, both dispersed and elemental compositions) and meteorological parameters were measured in Tsimlaynsk raion (Rostov oblast). The chemical composition of aerosol particles in the atmospheric surface layer has been determined, and the coefficients of enrichment of elements with respect to clarkes in the Earth’s crust have been calculated. It is shown that, in summer, arid aerosols are transported from both alkaline and sandy soils of Kalmykia to the air basin over the observation zone. Aerosol particles in the surface air layer over this region have been found to contain the products of combustion of oil, coal, and ethylized fuel. These combustion products make a small contribution to the total mass concentration of atmospheric aerosol; however, they are most hazardous to the health of people because of their sizes and heavy-metal contents. A high concentration of submicron sulfur-containing aerosol particles of chemocondensation nature has been recorded. Sources of aerosol of both natural and anthropogenic origins in southern Russia are discussed.  相似文献   

Cycles of seismic activity in the second half of the holocene in the Western Caucasus and their correlation with stages of civilization development: A case study of the upper reach of the Mzymta River     

A. N. Ovsuchenko  M. Yu. Menshikov  E. A. Rogozhin  A. M. Korzhenkov 《Izvestiya Atmospheric and Oceanic Physics》2016,52(8):816-840

The results of comprehensive research into the area of the upper reach of the Mzymta River (Western Caucasus) are presented. The evidence of strong earthquakes that struck the study area throughout history is studied. The periods when mud flows and rockslides associated with the earthquakes are identified to fall between 3100–4000 and 700–1200 years ago. Paleoseismological results are correlated to the results of archeological excavations. As a result, it is revealed that the periods of tectonic disasters coincided with the onsets of the period when the area was uninhabited (abandoned) by people. The results of the present comprehensive research provide additional information to specify the seismic hazard and the chronology of human habitation in the region.  相似文献   

Iceberg drifting and distribution in the Vilkitsky Strait studied by detailed satellite radar and optical images     

A. A. Kucheiko  A. Yu. Ivanov  A. A. Davydov  A. Yu. Antonyuk 《Izvestiya Atmospheric and Oceanic Physics》2016,52(9):1031-1040

This paper is devoted to the detection and identification of icebergs in the Russian Arctic Seas from the use of high- and medium-resolution radar and optical images from EROS-B, Radarsat-1, Radarsat-2, SPOT-4 and SPOT-5 Earth observation satellites. In July–September of 2011–2013, the SCANEX Research and Development Center, the Federal State Unitary Enterprise Atomflot, and other partner organizations provided operational satellite monitoring of icebergs in the Kara Sea and the Laptev Sea. More than 130 highly detailed optical and radar images were received and processed. The Vilkitsky Strait—one of the narrowest and most dangerous places within the Northern Sea Route—was chosen as an experimental polygon. As a result, iceberg location in the strait during the 2011–2013 navigation periods was analyzed, as were the iceberg size, area, drift direction, and height.  相似文献   

Observations of a cycle of intense coastal upwelling and downwelling at the research site of the Shirshov Institute of Oceanology in the Black Sea     

A. G. Zatsepin  K. P. Silvestrova  S. B. Kuklev  V. B. Piotoukh  O. I. Podymov 《Oceanology》2016,56(2):188-199

The paper presents the results of joint analysis of the response of vertical temperature and current velocity profile distributions in the coastal zone of the Gelendzhik region of the Black Sea to strong wind forcing in the third ten-day period of September 2013. This forcing was caused by the propagation of an atmospheric cyclone, which first initiated coastal upwelling that was later replaced by downwelling. We formulate a criterion for the development of full coastal upwelling and demonstrate its efficiency. We assume that frequent events of incomplete coastal upwelling and downwelling are associated with changes in the water dynamics (variations in the intensity and direction of the alongshore current) generally not related to local wind forcing.  相似文献   

Research during the 47th cruise of the research vessel <Emphasis Type="Italic">Akademik Ioffe</Emphasis>     

I. A. Nemirovskaya  A. N. Novigatskyi  Z. Yu. Redgepova 《Oceanology》2016,56(1):161-164

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