№ 4 (98) 2013
| ||А.П.Нагурный, А.П.Макштас, В.Т.Соколов Результаты измерения концентрации метана в приледном слое атмосферы на дрейфующей ледовой станции СП-39 (2011–2012 гг.) – повышенный фон концентрации метана (.pdf)||5|
| ||И.А.Мельников, Т.Н.Семенова Характеристика криопелагической фауны
современного морского ледяного покрова Центрального Арктического бассейна (.pdf)||14|
| ||В.Н.Смирнов, Л.В.Панов, В.Т.Соколов Динамика процесса разлома
дрейфующего ледяного поля станции «Северный полюс-38» (.pdf)||26|
| ||А.А.Намятов, И.А.Семерюк Применение параметра δ18O для анализа
происхождения водных масс на примере моря Лаптевых (.pdf)||35|
| ||Е.А.Гусев, П.В.Рекант, Д.Ю.Большиянов, Р.В.Лукашенко, А.О.Попко Псевдогляциальные структуры подводных гор поднятия Менделеева (Северный
Ледовитый океан) и континентальной окраины Восточно-Сибирского моря (.pdf)||43|
| ||Л.А.Тимохов, И.М.Ашик, С.А.Кириллов, В.Ю.Карпий, Н.В.Лебедев, В.Т.Соколов Термохалинное состояние поверхностного слоя Северного Ледовитого океана
в 2012 г. и тенденции наблюдаемых изменений (.pdf)||56|
| ||Н.В.Горюнова, В.П.Шевченко Новые данные о распределении
и вещественном составе нано- и микрочастиц в снеге Арктики (.pdf)||71|
| ||П.В.Рекант, Е.С.Миролюбова, И.А.Андреева, Л.С.Смирнова Сравнительный
анализ минеральных ассоциаций донных отложений прилаптевоморского
сегмента хребта Ломоносова и поднятия Менделеева как один из критериев
оценки источников обломочного материала (.pdf)||79|
| ||В.Г.Дмитриев Полуэмпирический метод оценки экологического риска
шельфовой и прибрежной арктической зоны для ключевых арктических районов (.pdf)||96|
| ||А.А.Дмитриев, Ю.А.Горбунов Ледово-гидрологические патрули
в российских арктических морях (.pdf)||104|
Table of contents
| ||A.P.Nagurny, A.P.Makshtas, V.T.Sokolov Measurement of the concentration of methane
in the under-ice layer of the atmosphere on a drifting ice station “North Pole - 39” (2011–2012 y.) – Increased background concentrations of methane.||5|
12 сентября 2013 г.
The background concentrations of methane in the under-ice layer of the atmosphere of the central part of the Arctic Ocean were higher concentrations at the monitoring stations of greenhouse gas emissions, located on the adjacent parts of the land. Marked seasonal variation of the concentration of methane, which has the nature of the two regimes. One with a high background value during the polar night and the second with low background value with the onset of the polar day. In the scale of daily changes in the concentration of methane in the station “North Pole-39” marked changes in the frequencies of the semi-diurnal tide and internal waves which indicates the existence of under-ice methane sources and sources located at the lower border of ice and its thickness. The tidal movement of the water deforms sea ice, adjusting the exchange of gases between the atmosphere and the under-ice layer of the Arctic Ocean. A number of mechanisms that describe the nature of the sources and sinks of methane in the central part of the Arctic Ocean. Estimate the maximum possible amount of methane released into the atmosphere from the Arctic Ocean to the average for the year, gives a value of 2,7 Mt / year, about 30 % of the total amount of methane to the atmosphere of the oceans.
Keywords: methane, background layer of the atmosphere, ice drifting station, Arctic ocean.
| ||I.A.Melnikov, T.N.Semenova Cryopelagic fauna of recent sea-ice cover
of the Central Arctic ocean||14|
22 августа 2013 г.
Camp EXPedition (PAICEX) in 2007-2011 have been investigated. Horizontal under-ice SCUBA diving catches were performed in parallel with vertical plankton net catches in the 0-50 m water column for identification of aborigine and immigrant animals of the cryopelagic community. Total list of indicated species is enumerated by 29 taxa in which the 20 were noticed on the under-ice surface and 24 in 0–50 m water column, respectively. The Sorensen similarity index between two groups is 0, 5. Remarkable differences by quality and quantity composition of the cryopelagic fauna during the 5-years period were observed. Fauna in the 2007–2009 periods were poor by number of species and individuals: only 5 species in which amphipod Apherusa glacialis and cyclopoid Oithona similis were yearly observed but copepods Metridia longa, Pseudocalanus minutus and cyclopoid Oncaea borealis were detected only once during the period of observation. The remarkable difference in species composition of the under-ice fauna during the 70-80th and the recent investigation were detected: from 11 invertebrate species – Apherusa glacialis, Gammarus wilkitzkii, Gammaracanthus loricatus, Metopa af. wiesci, Neupleustes sp., Pseudalibrotus nanseni, Mysis polaris, Tisbe furcata, Jaschovia johnoni and Antionella sarsi – aborigine mass numbered fauna in 1977–1981 – in recent study, the A. glacialis, G. wilkitzkii и T. furcata, were observed by which the last two species were noticed only ones during period of observation. Revealed differences in cryopelagic species composition can be explained by changes in the recent sea-ice cover of the Central Arctic Ocean where the multi -year ice domination is changed by the seasonal ice. After degradation of the physical substrate, the benthic-type animals (like amphipods) were not able to acclimate so fast to the plankton type of life that is required more time for adaptation.
Keywords: Central Arctic Ocean, sea ice, cryofauna, plankton, number.
| ||V.N.Smirnov, L.V.Panov, V.T.Sokolov Dynamics of the fracture process
of the drifting ice field of the station “North Pole-38”||26|
11 октября 2013 г.
Results of study of physical-mechanical process during compression and fracture of the ice field at the drifting station “North Pole-38” are discussed. The data of the observation of velocity, displacement and acceleration of the ice during a few months are presented. Processes of typical event caused by interaction of ice fields during which primary microshearings, cracks in the ice, mechanical self-excited oscillations and flexural-gravity waves waves are described. Features of this phenomena of interaction in the system atmosphere–ice–ocean can be considered as possibility of appearance of extreme events in the ice cover in the Arctic Ocean.
Keywords: drifting sea ice, waves, self-excited oscillations, fractures of ice, satellite images.
| ||A.A.Namyatov, I.A.Semeryuk The delta 18O values as tracer of water masses
formation by example of the Laptev Sea||35|
19 июня 2013 г.
Distribution of hydrological and hydro-chemical characteristics in the Arctic Ocean is under influence of distribution of river water, marine water and water formed in the processes of ice melting and formation. Fraction of marine water (fm), sea-ice melt water fraction (fi) and river runoff fraction (fr) for samples from the Laptev Sea were calculated on the base of temperature, salinity and δ18О datasets published on the official NASA website. Calculations of fractions were performed using system of equations describing the simple mixing of different water masses. The correlation coefficients fm and fr to the values of salinity were unusually high. Thus, the correlation coefficient between fm and salinity is 1 and fr and salinity – –0,95. Correlation coefficient between fi and salinity is low and depends on salinity range. In a salinity range from 0 to 10 ‰ value fi is positive, up to 40 %, or there is the predominance of the ice melting processes. In range of salinity from 10 to 35 ‰ fi value is mainly negative, it means the predominance of ice formation process. At salinities close to 35 ‰, fi values tend to zero. Gained characteristics δ18O, fm, fr, fi can provide additional information about origin and structure of the water masses.
Keywords: oxygen isotope, the Laptev Sea, river runoff, process of sea ice melting/formation, salinity anomalies.
| ||E.A.Gusev, P.V.Rekant, D.Yu.Bolshiyanov, R.V.Lukashenko, A.O.Popko Pseudoglacial structures of Mendeleev rise seamounts (Arctic Ocean)
and East Siberian continental margin||43|
31 октября 2013 г.
Observations made on the continental margin of the East Siberian Sea and the Mendeleev Rise, detected pseudoglacial structures that looks like structures formed by ice sheets. Circus-like structures at the edges of flat tops of the Mendeleev Rise seamounts associated with the slumping processes of waterlogged sediments. Lineaments on the sea floor could be formed by bottom currents.
Keywords: lineaments, ocean floor relief, slumping processes, ice sheets, Mendeleev Rise.
| ||L.A.Timokhov, I.M.Ashik, S.A.Kirillov, V.Yu.Karpiy, N.V.Lebedev, V.T.Sokolov The termohaline state of surface layer in the Arctic Ocean in 2012
and the tendencies of observed changes||56|
6 ноября 2013 г.
The termohaline state of the Arctic Ocean and seas in 2012 is discussed in the article based on data of oceanographic measurements. The positive anomalies of surface layer temperature and negative anomalies of salinity were observed on considerable part of the Canadian Basin during summer 2012. Along the continental slope of Eurasian Basin from the Fram strait and to the Laptev Sea more saline waters are evident in the surface layer while temperatures are within the mean climatic range excepting the area near the Fram strait. The dipolar structure of salinity anomaly spatial distribution over the Arctic is observed since 2007 and manifest the large negative anomalies in the Canadian Basin and insignificant positive anomalies in the Eurasian Basin. These dipolar anomalies remain in 2012 but underwent some changes: a tendency to salinity contrast decreasing between Eurasian and Canadian Basins is observed. The most essential changes occurred in the central part of Beaufort Gyre (Canadian Basin) during last 60 years are observed. The abrupt salinity decrease from 90th of last century to 2012 is found both for winter (from 30–31 ‰ to 26–27 ‰) and summer (from 29–31‰ to 24–25 ‰) periods.
Keywords: Arctic Ocean, oceanic surface layer, anomaly of surface layer temperature and salinity, tendency of changes, Eurasian basin, Canadian basin.
| ||N.V.Goryunova, V.P.Shevchenko New data on spatial distribution and composition
of nano- and microparticles in the Arctic snow||71|
20 мая 2013 г.
Study of nano- and microparticles in the Arctic is very important for understanding the processes of sedimentation. In this work the results of the field studies in the different Arctic regions during 2004–2009 are discussed. Snow samples were collected by a single method in different seasons of the year (including the polar night). More than 100 samples were studied.
Keywords: suspended particulate matter, Arctic, snow.
| ||P.V.Rekant, E.S.Mirolubova, I.A.Andreeva, L.S.Smirnova Mineralogy of the bottom sediment from Lomonosov Ridge and Mendeleev Rise as a possible proxy
to evaluation of the source rock||79|
3 сентября 2013 г.
Study of the mineralogical assemblages of the bottom sediments from 15 stations located nearby the bedrock outcrops on the Lomonosov Ridge and Mendeleev Rise done. Based on this regional diversity of the mineral assemblages of the Lomonosov Ridge and Mendeleev Rise revealed. In addition, the sub-regional spatial clusters differ by mineral assemblages, have been outlined within both structures. The limits of the clusters coincide with main tectonic boundaries. For those stations the ice rafted debris is not predominant in the deposits. Beside this in the sediments significant amount of the edaphogenetic debris occurs. The results allowed us to perform an assessment of the original bed rock rocks composition.
Keywords: mineralogical assemblages, Lomonosov Ridge, Mendeleev Rise, edafogenic deposits, ice rafted debris.
| ||V.G.Dmitriev Semiempirical approach to ecological risk assessment for marine
and coastal zones in Arctic||96|
12 ноября 2013 г.
Practical approach to ecological risk assessment is proposed. By this approach a general risk distribution for selected territory can be achieved. Method was applied to Russian Arctic (marine and coastal zones) and results were mapped.
Due to approach universality, maps with ecological risk distribution can be done with arbitrary details if sufficient information is collected.
Keywords: Arctic, shelf and coastal arctic zones, ecological risk, ecological risk assessment, ecological risk map.
| ||A.A.Dmitriev, Yu.A.Gorbunov Ice and hydrological patrols in Russian Arctic Seas||104|
19 августа 2013 г.
In the present work for the first time it was carried out the consolidation of information about ice and hydrological patrols worked in the Russian Arctic Seas from the moment of its creation in 1936 up to the termination of their navigation in the 90’s of the last century.
The goals and tasks of these expeditions, regions of carrying out, vessels names and names of the heads of expeditions were fixed.
It is emphasized a very important scientific and practical value of these expeditions.
This consolidation is a result of analysis of more than 150 reports of ice patrols expeditions (A-61, A-63, A-64, A-65) and reports of scientific and operative groups of West, Central and East regions of Arctic affiliated to Marine Operations Headquarters, stored in the science funds of AARI.
Key words: Arctic ice patrols in Russian Seas.
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