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    30 June 2002, Volume 14 Issue 2 Previous Issue    Next Issue

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    COMPARISON ON ECOLOGY OF SKUA POPULATIONS BETWEEN GREAT WALL STATION AND ZHONGSHAN STATION
    2002, 14 (2):  83-92. 
    Abstract ( 1438 )   PDF (411KB) ( 1671 )  

    The skua's nesting, feeding behavior, population variances and breeding success as well as their habitat natural conditions in the areas near Great Wall Station and Zhongshan Station in Antarctica were compared. The results show that there are evident differences in their population ecology. The habit in foraging is much related to regional ecosystem and food resources near their breeding grounds. Dependence on human food remains does influence skua's diet,which affects considerably ecological behavior as well as population variation of both species in both areas. The population in higher latitude, such as Zhongshan Station, could shorten and/or regulate the timing for their egg lying and hatching, and take precedence of one chick brooding, so that it could keep their breeding success for species continuation.

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    PRELIMINARY STUDY ON METAMORPHIC BASIC ROCKS IN THE GROVE MOUNTAINS, EAST ANTARCTICA
    2002, 14 (2):  93-104. 
    Abstract ( 1415 )   PDF (257KB) ( 1230 )  

    Mafic granulites and amphibolites that underwent granulite facies metamorphism are outcropping in the Grove Mountains (GMs), East Antarctica. The mafic granulites underwent a near isothermal decompression (ITD) P T history from 0.93GPa and 800℃ (M1) to 0.64GPa and 805℃ (M2). This clockwise P T path can be explained in a model involving extensional collapse and exhumation of thickened crust, which was common with that of Larsemann Hill, East Antarctica. The compositions of major elements from the rocks are consistent with those of basalt and have evolutional current of tholeiite. Based on more geochemical signatures, two types of basalt are recognized, namely, ocean island basalt (OIB) and mid ocean ridge basalt (MORB). Type 1 rocks have similar geochemical characteristics, with high in Ti (TiO 2 =2.68%), REE (=202μg/g), LREE \[(La/Yb) N =4.8\], Ti/Y (=343) and Zr/Ti (=3.1), which are similar to those of OIB, and are considerable to be products of magma from enriched mantle sources (EM). Type 2 rocks are characterized by low Ti (TiO 2 = 1.1-1.31% ), REE (47-93μg/g), LREE/HREE (2.27-2.54), (La/Yb) N (=1.30-1.62) and lower P (P 2 O 5 =0.1-0.2%) than those of OIB, which are similar to those of MORB. The presence of such rock assemblages suggests the existence of an ocean basin in this region during Pan Africa ages.

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    SR-XRF ANALYSIS OF THE 3 SPECIES OF POLYTRICHUM IN THE FILDES PENINSULA OF ANTARCTICA
    2002, 14 (2):  105-112. 
    Abstract ( 1313 )   PDF (363KB) ( 1286 )  

    In order to study the elemental composition and distribution of various mosses and different parts of Antarctica, we have analyzed the heavy elements of 3 species of Polytrichum by synchrotron radiation X ray fluorescence in Fildes Peninsula. The experimental specimens are P. alpinum, P. juniperinum and P. alpestre , and their elements are same nearly, including mainly K, Ca, Mn, Fe, Cu, Zn and Sr and so on. It'll show us the habitats of 3 species of Polytrichum are sililar in Fildes Peninsula. But the peak of K is very high than one of Ca, and the peak of Ca is higher than one of Fe in P. alpinum . In P. juniperinum the peak of K is higher than one of Ca, and the peak of Ca is close to one of Fe. The peak of K is nearly equal to them of Ca and Fe in P. alpestre . By X ray fluorescence analyzing different parts of P. alpestre and counting relative concentration of elements by fluorescence counts, we found that the difference of the parts is clear. The concentration of K of apical bud is the highest among parts, the proportion of K/Ca is 1.30, but that are all below 1 in the other parts. The concentration of Mn of pseudo root is the highest among parts, and the ratio of Mn/Fe is the largest, and the proportion is 0.21. In the parts of older leaf and pseudo root, the ratios of Cu/Zn are separately 1.20 and 1.84, but that are not enough 1 in the other parts. The element of Br is arisen specially in the older leaf and pseudo root parts, and that may has something to do with the organs aged.

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    SPECIES COMPOSITION AND DISTRIBUTION OF PHYTOPLANKTON IN CHUKCHI SEA AND BERING SEA
    2002, 14 (2):  113-125. 
    Abstract ( 1936 )   PDF (237KB) ( 1846 )  

    Based on 48 net samples and 24 water samples from Chukchi Sea(66°0.3N-75°18.6N,153°36.5E-174°59.5W) and Bering Sea (55°59.8N -66°0.3N, 173°21.1E-175°53.9W) collected during FCNARE(1999) cruise of Xuelong Research Vessel of SOA, China, 121 phytoplankton species (including varieties and forms) in 43 genera of 3 phyla have been identified. Among them, 103 species in 33 gerera were from Chukchi Sea , 71 species in 25 genera were from Bering Sea, and 49 species were from both two seas. These species can be divided into 4 ecological groups:(1) Arctic group; (2) Arto-subarctic group; (3) Boreal-temprate group and (4) Eurythemal group. The dominant species were respectively Nitzschia grunowii, Thalassiosira nordenskioldi and Chaetoceros socialis in Chukchi Sea, and Denticula seminae, Nitzschia delicatissima, Nitzschia seriata and Thalassiothrix longissima in Bering Sea. The average abundance (8.32×10 7cells/m 3) of phytoplankton from Chukchi Sea was higher than that (1.58×10 6cells/m 3) in Bering Sea. The distribution characteristics of phytoplankton in surveyed areas and their relationship with the environmental factors (including biological factors) are discussed .

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    DISTRIBUTION OF THE ZOOPLANKTON IN BERING SEA IN SUMMER
    2002, 14 (2):  126-135. 
    Abstract ( 1599 )   PDF (483KB) ( 1574 )  

    A total of 90 species of zooplankton were found and recorded in samples collected in the Bering Sea (55° 59′-60° 40′N, 173° 21′E-175° 54′W) by the Chinese First Arctic Scientific Expedition during the period from July to August in 1999. These species can divided into 4 ecological groups of arctic, sub arctic, oceanic cool water and world wide eurytherma, The most important group was sub arctic whidh was dominated by Eucalanus bungii , Calanus plumchrus , C. cristatus and Metridia pacifica and characterised by sub arctic community of the pacific ocean. The total zooplankton biomass reached 425.4mg/m 3 , showing a high to low biomass distribution from south to north and from peripheral to centre. Vertically, it was high (43%) in layer of 50-0m and low (8.4%) in layers of 200-100m in deep waters (<500m) and the pattern varied significantly with maximum biomass moving to deeper waters during the daytime and toward the surface at night in shallow waters (<100m). The distribution of populations were different in water layers and ever it varied with different developing stages for the same population.

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    APPLICATION OF GPS TECHNOLOGY TO METEOROLOGY IN ANTARCTIC
    2002, 14 (2):  136-144. 
    Abstract ( 1672 )   PDF (290KB) ( 1943 )  

    This paper mainly discusses how to deduce the atmospheric Precipitable Water Vapor (PWV) from tropospheric zenith wet delay using ground based GPS receivers. The data from SCAR Epoch 1998/1999/2000 Antarctic GPS Campaigns are used to construct the GPS analytical networks. A high accuracy GPS processing software package--GAMIT/GLOBK is utilized; Multiple schemes are adopted and we got the tropospheric zenith all delay. Two kinds of models, Saastamonien and Hopfield, are used to calculate the zenith dry delay. Before calculating the atmospheric Precipitable Water Vapor (PWV), we firstly use the long term meteorological data of the two stations to calculate the K value, which is accommodated with the time January and February of the two stations. After that wet zenith delay is calculated into PWV, and field meteorologic data are combined to analyzing. Good results are achieved for all sessions and stations.

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    A STUDY OF TEMPERATURE AND HUMIDITY FIELD IN GREAT WALL STATION, ANTARCTICA
    2002, 14 (2):  145-156. 
    Abstract ( 1537 )   PDF (257KB) ( 2078 )  

    Based on the ten year (1985-1996) observational data and the facsimile charts from Chinese Antarctic Great Wall Station. The temperature, humidity fields and precipitation were studied. The result showed that low temperature, high humidity and long precipitation days are the significant characteristics in Great Wall Station area. This weather type was affected mainly by the local pressure fields, the activity of polar cyclones and the sea surface with drifting ice and snow in sub-polar region.

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    DESIGN OF CHINESE GIS IN ANTARCTICA AND ITS REALIZATION ON INTERNET
    2002, 14 (2):  153-162. 
    Abstract ( 1335 )   PDF (567KB) ( 1432 )  

    The requirement to Antarctica data's access, publishing and sharing on Internet increases each day with the rapid development of scientific research and groundwork surveying and mapping on Antarctica. The existing GIS data of Antarctic topographic database is almost isolated information and data is acquired, stored and analyzed to meet the need of single project or program, which results in data redundancy and inefficiency of data collection and storage. The development of Geographic Information System (GIS) application is based on concreting in dependent and close platform; moreover, they are conflict in data semantic, so that they can't realize data sharing between them. The increasing requirement to Antarctica information advances the development of cause of Antarctica scientific research. At the same time, human beings have the demand to acquire more and more information on Internet, especially the spatial information of Antarctica. By utilizing the Antarctic Surveying and Mapping data concerning the recent two decades, An internet based GIS of Antarctica was set up under the GIS software GeoStar. This paper briefly presented the design methods and its preliminary function of China's Internet based GIS of Antarctica. Compared with the traditional GIS, Internet GIS has the following benefits:Firstly, Internet technology transfers GIS which has only been used by professional to public information system which can be used by everyone who knows about Internet in any way or any time. In other words, it makes GIS enter into everyone.Secondly, it can reduce expenditure in data promulgation and improve geographic data's share extent and avoid data's collection repeatedly by means of accessing data on Internet.Thirdly, it can construct geographic information service network via Internet based GIS technology by means of the facilities of information highway. This system includes many functions. Firstly, It will be available on all platforms and operation systems where the JAVA Virtual Machine is equipped with. Users can start up this system with any WWW browser, such as Netscape Communicator and Internet Explorer. After being started, it has no relationship with the WWW browser. Secondly, this system can be operated expediently. Without installation, users can start this system when they know the IP address of this system. Thirdly, users can analyze map features and descriptive attribute information for query, spatial analysis, thematic map production, distance analysis and tabular manipulation and etc. Fourthly, this system provides the printing function. All kinds of results including mapping and tabular manipulation can be printed on the Client side printer and it is independent of the Server and the detailed printer type of the Client side. Fifthly, this system runs simultaneously in multi-languages at the same time such as Chinese, English and Japanese. Sixthly, the system produces the multi-scale graphics to be visually manipulated and users can acquire multi data source on Internet and provides the multi-media and explicatory function. Lastly, Security. Users can get data information, but can not save data information in client side.On the basis of it, a prospect for it better serving the Antarctic expedition, research and logistics management in the future was presented.

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