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This article describes the atmospheric boundary layer structures and the turbulent flux transfers of heat and momentum over Zhongshan Station area, using Tethersonde Meteorological Tower (TMT) observation data, in the summer expedition of 1994-1995. With comparison of the atmospheric boundary layer structures and the turbulence transfers at three observation sites (with different topographic features) close to Zhongshan Station (69°22′S, 76°22′E), it is showed that the atmospheric boundary layer structure and the turbulence flux transfer are rather complicated and quite dependent on local topographic feature in Antarctica.
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The age of the volcanic rocks of the Mount Bowles Formation (MBF) on the eastern part of Livingston Island, South Shetland Islands, Antarctica is redetermined by using 40Ar/39Ar and laser microarea isochron age dating method with a continuous laser system and mass spectrometer. The isochron ages of an andesite sample and a basaltic andesite sample are (105.62±2.11) Ma and (111.48±2.23) Ma with the , 0Ar/36Ar initial ratios of 295.3 and 294.6 respectively, being almost the same as the atmospheric valuer which proves that there exists no excess argon in these rocks. The 40Ar/39 Ar plateau age of an aplite sample is (96.7± 1.6) Ma and the calculated isochron age is 96.6 Ma, which indicates that the aplite occurred after lava eruption. These data suggest that the MBF volcanic rocks were formed during Cretaceous.
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This paper is based on the surface wave seismogram of South Sandwich Island earthquake (Ms = 6. 4) recorded by Antarctic General Bernardo O'Higgins Station. We computed a group velocity dispersion of Love surface wave and obtained lithosphere structure by using the method of the matched-filter frequency-time analysis and grid dispersion inversion. Our result shows that crust structure below Antarctic Peninsula may be divided into three layers and their thickness are respectively 5 km, 8 km and 10 km. Upper mantle velocity is 5. 32 km/s and gradually changes into 5. 11 - 4. 9 km/s below 53 km. The mininum velocity is 4. 8 km/s. It can be referred that Antarctic mantle is also of layered structure.
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In this papers shapes and surface textures of quartz grains in 13 layers of a core (NP95-1) collected from a continental slope at the Antarctic Prydz Bay were quantitatively and statistically analyzed. The quartz grain surfaces exhibit the characteristics caused by intense glaciation and a weaker chemical solution-precipitation, indicating the sediments are mainly morainic debris under a low energy marine environment. The obtained quantitatively statistical results of the assemblages of surface textures caused by the chemical solution-precipitation are well correlated to the analytical results of micropaleontologic analysis and can be used to better explain the changes of sedimentary environment and paleoclimate occurred in the marine zone concerned.
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The Great Wall Station of China (62°13′S, 58°58′W) is located at the Fildes Peninsula of King George Island, South Shetland Islands, Antarctica. Sediments in the area can be divided into glacial 9 periglacial 9 fluvial lacustrine and littoral deposits in origin. Analysis of the fine particals (below 3.52 mm) shows obviously difference among grain size composition, frequency curve, accumulative curve and scatter diagram. In order of periglacial-glacial-fluvial-littoral deposit, sand increases, silt and clay decreases;sorting changes from poor to good;mean grain size is at very fine-fine-medium-coarse sand respectively; skewness changes from very positive to near symmetric. Scatter diagram of grain size parameters shows difference in the sediments. Variation among frequency curves reflects processing and forming condition of the sediments. The fluvial and littoral deposits follow normal distribution, they are straight lines in normal accumulative diagram. The glacial and periglacial deposits follow Rosin, s distribution, they are straight lines in Rosin's accumulative diagram.
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Information on the organic compounds in water of Mochou Lake and Heart Lake, Antarctica is given in this paper. 93 organic compounds were identified from 121 chemical constituents in lake water, including n-alkanes, lipidal isopentadi-enes, aromatic hydrocarbons, polycyclic aromatics, alcohols, aldehydes, ketones, esters , monocarboxylic acids and phthalic esters in the range of 0.027-4.79μ/L. Organic compounds of global occurrence like BHC, DDT and PCBs were detected in the water, at the concentration of 0.012-0.356 μ/L.
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Ionograms taken from a Digisonde Portable Sounder (DPS-4) at Zhongshan Station of Antarctica in 1995 are used to analyse the mean ionospheric properties in winter. The F region is rather unstable in winter and has large diurnal variation. The monthly medium value of
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In order to research contemporary crustal movement of Antarctica, China has constructed the deformation monitoring network in the Fildes Strait region,West Antarctica, monitored the network by using DI-20 geodimeter and GPS instruments, and participated the Antarctic GPS Campaign Observation organized by SCAR as well. During mathematics processing of crustal horizontal deformation observations, a method to bring deformation parameters into the error equations of observations is discussed in this paper. Several classical deformation models,such as rigid body displacement and strain,are introduced. By analyzing the reference datum of static and dynamic geodetic network, the method is developed to set up different additional weight matrix for every different kind of parameter. A series of programs are developed to implementing the method mentioned above and the analysis of West Antarctic Fildes Strait deformation monitoring network. Discussion is also made of GPS monitoring data by using the principle of monitoring network strain analysis in the paper. The research results indicate that the displacement did occur in Fildes rift region,but the displacement was not larger just a slight rift shear movement.
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An unidentified geophysical event is first reported in this paper. It was recorded with Lacoste Romberg earth tide gravity meter (ET-21 ) at Chinese Antarctic Zhongshan Station.
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Antarctic data management is the research focus, which the international Antarctic organizations, e. g. Antarctic Treaty Consultative MeetingCATCM) , Scientific Committee on Antarctic Research (SCAR) , and Council of Managers of National Antarctic Programmes (COMNAP) have been paying close attention to and promoting actively. Through the co-effort of international Antarctic organizations and member countries concerned in recent years, Antarctic Data Directory Syatem (ADDS) is established as the most important basic programme for development of the international Antarctic data management system. At present, Joint Committee on Antarctic Data Management (JCADM) is responsible for organizing and coordinating the international Antarctic data management, and implementing the project ADDS. In this paper the background on Antarctic data management in time-sequence and the structure of international framework are introduced, meanwhile, it is necessary to develop ADDS first of all. The ADDS mainly consists of the two principal parts : National Antarctic Data Center (NADCs) of all the party members and Antarctic Main Directory (AMD) , the best available technology for creating ADDS is to make full use of International Directory Network (IDN) and adopt its Directory Interchange Formats (DIF) . In the light of the above requirements, combined with Chinese-specific situation, the contents, technical and administrative methods on Chinese Antarctic data management are discussed to promote our related work.
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