Top Downloaded

Published in last 1 year | In last 2 years| In last 3 years| All| Most Downloaded in Recent Month | Most Downloaded in Recent Year|

All

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

OUR UNDERSTANDING OF ARCTIC VORTEX ADVANCES IN POLAR SCIENCE    2006, 18 (1): 52-62.   Abstract （2614）      PDF（pc） （1887KB）（5132）       Knowledge map    Save The Arctic vortex is a persistent large-scale cyclonic circulation pattern in the middle and upper troposphere and the stratosphere. Its activity and variability are related to the semi-permanent active centers and the cyclone activity with the short-time scale in the pan-Arctic. Its variability in the strength, which is directly related to the atmosphere, ocean, sea ice and ecosystem in the Arctic, has an effect on the lower atmospheric circulation and affects the weather in the sub-Arctic and even at the middle latitudes. The transition of the circulation from a warm anticyclone to a cold cyclone occurred in the middle and upper stratosphere during 2003 Chinese Arctic Research Expedition. The mechanisms coupling the stratosphere and troposphere have been studied by some scientists for understanding the effect of the polar vortex change on the lower circulation. The effect of the stratospheric sudden warming on the polar vortex break down was found early in the fifties of the last century and has been taken great note. The Arctic Oscillation (AO), relating to the change of the Arctic vortex, has been used to study the effect of the Arctic vortex on the climatic change. The recent Arctic vortex research is simply reviewed in the paper. Our understanding of the Arctic vortex is given and some different view and questions are also discussed. Related Articles | Metrics | Comments（0） Cited: Baidu(12)

Select

A COMPARATIVE STUDY OF THE ADMINSTRATION FOR THE NORTHWEST PASSAGE AND NORTHERN SEA ROUTE Zou Leilei, Huang Shuolin, Fu Yu ADVANCES IN POLAR SCIENCE    2014, 26 (4): 515-521.   DOI: 10.13679/j.jdyj.2014.4.515 Abstract （1785）      PDF（pc） （629KB）（4401）       Knowledge map    Save Canada and Russia act as the de facto executive body for the Northeast Passage and Northern Sea Route, respectively. A comparative study will be conducted to explore similarities and differences in the administration for Arctic waterways by the two countries. The comparative study will provide insight into similarities and differences in sovereignty claims for Arctic waterways, priority for sovereignty claims or profit claims, and attitudes towards the prospects of commercial shipping in the Arctic waterways. Furthermore, the comparative study will identify differences in attitudes towards the importance of the Arctic waterways to national security, as well as different attitudes towards the environmental protection of Arctic waters. A good understanding of the administration for Arctic waterways will facilitate the understanding of current and future policies for Arctic passages of both countries. As a result, the international community will be well informed and well prepared for the future commercial shipping in the Northwest Passage and the Northern Sea Route. Related Articles | Metrics | Comments（0）

Select

APPLICATION OF ELECTROMAGNETIC-INDUCTION IN THE BALTIC SEA ICE THICKNESS MEASUREMENT ADVANCES IN POLAR SCIENCE    2007, 19 (2): 99-110.   Abstract （1864）      PDF（pc） （1492KB）（4328）       Knowledge map    Save Sea ice,as a component of the cryosphere,is very sensitive to the climate change.Study of sea ice physics needs accurate sea ice thickness data.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and its successful application in Baltic Sea.Based on the electromagnetic field theory and by applying the electrical properties of sea ice and seawater,this technique can detect the distance between the EM instrument and the ice/water interface accurately,so the sea ice thickness can be obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at the same position allows a construction of the transformable formula of the apparent conductivity and sea ice thickness,and the verification of the sea ice thickness calculated by this formula indicates that electromagnetic-induction technique is able to measure sea ice thickness with good accuracy.The average relative error between EM measurements and drill holes data was 12%.The statistic of all ice thickness profiles shows the distribution of smooth surface ice in the Bay of Bothnian was 0.4—0.6 m.This result is in consistent with the EM-bird measurement. Related Articles | Metrics | Comments（0）

Select

THE LEVEL,DISTRIBUTION AND TRANSPORTATION OF PERFLUORINATED COMPOUNDS IN ARCTIC AND ANTARCTIC WU Xiao-Guan, XIE Zhou-Qing ADVANCES IN POLAR SCIENCE    2009, 21 (3): 197-210.   Abstract （2650）      PDF（pc） （552KB）（4285）       Knowledge map    Save PFCs has been widely used in the industry and our life. Recently,it has been found to be significant toxic for human and biology and then received intensively concerns. In the remote Antarctic and Arctic region,such compounds have also been found in the biological tissues and the other environmental materials,indicating that PFCs become a new global persistent organic pollution (POP). Its level,distribution and transportation should be attracted much attention and further investigation. Related Articles | Metrics | Comments（0） Cited: Baidu(8)

Select

Interaction between sea ice/iceberg and ship structures: A review JI Shunying & LIU Shewen ADVANCES IN POLAR SCIENCE    DOI: 10.3724/SP.J.1085.2012.00187

Select

DEM GENERATION AND ANALYSIS OF FILDES PENINSULA USING IKONOS STEREO PAIRS ADVANCES IN POLAR SCIENCE    2007, 19 (4): 266-274.   Abstract （1936）      PDF（pc） （676KB）（3802）       Knowledge map    Save The paper mainly addresses DEM generation and analysis of the Fildes Peninsula using IKONOS stereo pairs.IKONOS uses the Rational Polynomial Camera(RPC) model, also called an Image Geometry Model(IGM),as a substitute of rigid geometrical model based on the collinearity equation.The horizontal and vertical accuracies of generated DEM are mainly dependant on the accuracy of RPC model.By only using RPC model,the positional accuracy and vertical accuracy of reference product suite are 25 m(CE90) and 22 m(LE90) respectively,which can't meet the requirements of high accuracy topographic map.In order to improve the accuracy,the ground control points collected during CHINARE-23,2006/2007,are used to revise the previous RPC model.It reveals that the accuracy of extracted DEM improves apparently,which can meet the requirements of 1∶5000 remote-sensing cartographic map and 1∶10000 topographic map. Related Articles | Metrics | Comments（0） Cited: Baidu(11)

Select

EFFECTS OF THE WINTER AO AND THE ARCTICSEA ICE VARIATIONS ON CLIMATEVARIATION OVER EAST ASIA ADVANCES IN POLAR SCIENCE    2004, 16 (3): 211-220.   Abstract （2146）      PDF（pc） （465KB）（3793）       Knowledge map    Save This paper briefly reviews effects of the winter Arctic Oscillation (AO)(the North Atlantic Oscillation, NAO) and the Arctic sea ice variations on climate variations over East Asia, problems existed in studies, and scientific issues that need to be resolved urgently in the future. Related Articles | Metrics | Comments（0） Cited: Baidu(83)

Select

CHANGE DETECTION ON ANTARCTIC GLACIER FROM THE FLUCTUATION OF SAAS AND NSCAT BACKSCATTERING ADVANCES IN POLAR SCIENCE    2004, 16 (2): 106-113.   Abstract （1825）      PDF（pc） （244KB）（3780）       Knowledge map    Save The backscattering characteristic of firn layer in Antarctica has tight relevance to liquid water content. The increasing of liquid water content caused by melting will reduce the backscattering greatly. Using the Ku band scatterometer data from SAAS(1978) and NSCAT(1996) for differential analysis, the regions showing remarkable fluctuations are given. Focusing on Ellsworth Land, the historic weather record is combined for analysis. It is concluded that the reduction of backscattering is partly out of the increasing temperature or melting. Related Articles | Metrics | Comments（0）

Select

USING MODIS SATELLITE DATA TO ANALYSE THE RELATIONSHIOP BETWEEN CHLOROPHYLL A AND AEROSOL OPTICAL DEPTH IN THE GREENLAND SEA QU Bo, LU Hai-Lang, Albert Gabric, LIN Dao-Rong, QIAN Feng, ZHAO Wei-Hua ADVANCES IN POLAR SCIENCE    2011, 23 (1): 68-76.   DOI: 10.3724/SP.J.1084.2011.00068 Abstract （2684）      PDF（pc） （595KB）（3501）       Knowledge map    Save Arctic ecosystems and global climate are closely related. This paper studies the distributions and the coupling relationship between Chlorophyll a (Chl a) and aerosol optical thickness (AOD) in Greenland Sea (10°W—10°E, 70°N—85°N) during 2003—2009 using satellite ocean colour data from MODIS Aqua. The regression analysis of EViews shows that Chl a and AOD are correlated with a time lag. Based on the lag of Chl a and AOD, co-integration inquiry finds that there is co-integration between them, which means that they will have a long-term equilibrium relationship. In general, Chl a starts from March, and gradually increases to a peak in July. The peak of AOD is usually in May, 11 weeks before Chl a. After shifting the time lag, the correlation between Chl a and AOD is 0.98 in the spring in 80°N—85°N. Apart from the year of 2005, when Chl a and AOD had no time lag, the other years’ intervals increased about 6 weeks within the 7 years. The peaks of AOD shifted one and half months ahead, while Chl a also shifted about two months ahead. In northern part (75°N—85°N), Chl a and AOD were much higher in the summer and autumn of 2009 than those in other years. The reason could be the much larger ice melting and higher AOD. The results indicate that the global warming has significant impact on the ecosystem in the Arctic Ocean. Related Articles | Metrics | Comments（0） Cited: Baidu(5)

Select

GEOCHEMICAL EVIDENCE FOR THE INFLUENCE OF HISTORICAL SEA BIRD ACTIVITIES ON MOCHOU LAKE SEDIMENTS IN THE ZHONGSHAN STATION AREA, EAST ANTARCTICA ADVANCES IN POLAR SCIENCE    2004, 16 (4): 295-309.   Abstract （2073）      PDF（pc） （652KB）（3490）       Knowledge map    Save An 85cm long sediment sequence from Mochou Lake on Mirror Peninsula in the Larsemann Hills, East Antarctica, was investigated for elemental geochemistry, biogeochemistry and strontium isotopic compositions in the acid-insoluble and acid-soluble fractions. The geochemical characters of the elements in the bulk sediments and the ~~ ~87 Sr /~~ ~86 Sr ratios in the acid-soluble fractions suggest that the lake is strongly affected by historical sea bird activities in the catchment area. The depth distributions of amino acids in the sediments show that the sedimentary organic matter is not influenced by post-depositional diagenetic processes, and their concentrations mainly reflect the historical variation in the primary biogenic production produced in the lake. The ~~ ~87 Sr /~~ ~86 Sr ratios in the acid-soluble fraction of the sediments are found to be negative correlation with the concentrations of total amino acid, indicating the enormous role of historical seabirds on nutrient supply into the Mochou Lake. The present results provide a foundation for further studies at a large temporal scale on the reconstruction of lacustrine palaeoecology and the records of palaeoclimate and historical sea bird occupation in the catchment area of the lake. Related Articles | Metrics | Comments（0） Cited: Baidu(22)

Select

PROSPECT OF RESEARCH ON ARCTIC BLACK CARBON AEROSOL Zhan Jianqiong, Chen Liqi, Zhang Yuanhui, Yang Xulin, Li Wei Chinese Journal of Polar Research    2010, 22 (1): 56-68.   DOI: 10.3724/SP.J.1084.2010.00056 Abstract （3146）      PDF（pc） （1172KB）（3451）       Knowledge map    Save Over the past 100 years, the average temperature increasing rate in the Arctic is about twice as the global average temperature increasing rate. Althouth the anthropogenic long-lived greenhouse gases play a predominate role in radiation forces in weather system, the black carbon aerosol and other short-lived pollutants could also explain a significant fraction of the Arctic warming. Therefore, reducing the emission of black carbon aerosol into the atmosphere will cool the planet and make a negative feedback... Related Articles | Metrics | Comments（0） Cited: Baidu(20)

Select

PROGRESS ON INVESTIGATION AND RESEARCH OF POLAR MICROBIOLOGY IN CHINA ADVANCES IN POLAR SCIENCE    2005, 17 (4): 299-307.   Abstract （1819）      PDF（pc） （358KB）（3436）       Knowledge map    Save Investigation and Research Organized and constructed on polar microbiology of China own accord began at the early of the eighties of the last century. During about twenty years till now, the plentiful and substantial achievement of the research on polar microbiology was obtained by Chinese scientists. The areas surveyed included the locations of great wall station and Zhongshan station, and their surrounding country and air, water, the waters of the southern ocean, Antarctic region, Bering Sea and Chukchi Sea etc, the Arctic Ocean, the living and nonliving materials and Qinghai-Tibet plateau. The samplings were studied and analyzed extensively and more deeply. On the kinds and groups, content, biodiversity, Characteristics of growth, Specific physiological and biochemical properties, and phylogeny development. The significant discovery was progressed on some of polar microbial bioactive substances.Lastly, this paper looks forward to the future on Chinese polar microbiological research. Related Articles | Metrics | Comments（0） Cited: Baidu(9)

Select

ACCUMULATION OF SEDIMENTARY ORGANIC CARBON IN THE ARCTIC SHELVES AND ITS SIGNIFICANCE ON GLOBAL CARBON BUDGET ADVANCES IN POLAR SCIENCE    2004, 16 (3): 193-201.   Abstract （2270）      PDF（pc） （407KB）（3432）       Knowledge map    Save Sedimentary organic carbon accumulation rate in continental margin seas is more than one order higher than that of the oceans. Ocean margins play a very important role in global carbon budget since about 80% of terrestrial and marine organic carbon buried in the continental shelves. Of the Arctic Ocean total area over 30% is shelf, and it is accounted for one-fourth of global shelf area. Because of its ice cover biological pump in the Arctic Ocean was thought to be very limited, thus it has not been considered as a sink of carbon dioxide. With the recent observation of global warming, decreasing of ice cover in shelf area would lead to potential simulate primary production, thus increase sedimentary organic carbon accumulation rate in the shelves. In this review paper, organic carbon sources, riverine discharge of sediment and nutrients, sea ice cover variation, and biological pump were discussed in order to evaluation potential increasing of sedimentary organic carbon accumulation in the arctic shelves under global warming. Related Articles | Metrics | Comments（0） Cited: Baidu(50)

Select

THE ARCTIC SEA ICE,CLIMATE AND ITS RELATION WITH GLOBAL CLIMATE SYSTEM ADVANCES IN POLAR SCIENCE    1999, 11 (4): 301-310.   Abstract （1625）      PDF（pc） （473KB）（3257）       Knowledge map    Save The Arctic sea ice distribution, thickness variation, surface characteristics and snow cover variation as well as the climatology and its regional differentiating are discussed according to previous research results and our observation in the Arctic Ocean, August 1999. A comparison of sea ice between Arctic and Antarctic areas is conducted. It can be found that, the climate trend in Arctic Ocean is different from the areas around the ocean. This is mainly due to alternate distribution of ice floes and open water in Arctic Ocean in summer, the drifting, melting and absorbing heat of sea ice, which balance the temperature fluctuation around. Related Articles | Metrics | Comments（0） Cited: Baidu(29)

Select

MOLECULAR MECHANISM OF COLD-ADAPTATION OF POLAR MICROORGANISMS ADVANCES IN POLAR SCIENCE    2003, 15 (1): 75-82.   Abstract （1893）      PDF（pc） （429KB）（3249）       Knowledge map    Save Polar microorganisms possess specially genetic, physiological and biochemical properties for the uniquely geographic and climatic features in Antarctic and Arctic. The cold temperature of polar environment has a wide ranging influence on all of the microbial ecosystems of this region. Adaptation mechanisms of polar microorganisms for this environmental factor are studied in detail in recent years. This paper briefly describes the advances in molecular mechanism of cold adaptation of polar microorganism in aspects including low temparature enzymes, cell membrane, cytoplast and so on. Related Articles | Metrics | Comments（0） Cited: Baidu(36)

Select

STATISTIC CHARACTERISTICS OF THE AURORA OBSERVED AT ZHONGSHAN STATION, ANTARCTICA ADVANCES IN POLAR SCIENCE    1999, 11 (1): 11-21.   Abstract （1692）      PDF（pc） （269KB）（3239）       Knowledge map    Save The auroral data observed by All Sky TV Camera during 1995 and 1997 at Zhongshan Station of Antarctica are used to analyze the statistic characteristics of the aurora appearing over Zhongshan Station. Around postnoon(1400￣1800MLT)and midnight (2200￣0300MLT), aurora appears more frequently and stronger than that around evening(1800￣2200MLT).The corona type aurora mainly occurs at polarward and overhead of Zhongshan Station during postnoon and around midnight. The band type aurora mainly appears during postnoon, while during evening and around midnight only appears at equatorward. The active surges mostly appear around midnight, while the transpolar arcs mainly occur after midnight. And except for the transpolar arcs, the appearance frequences of other three kinds of aurora are related with Kp index. Usually Zhongshan Station enters the auroral oval at postnoon, the exact time depends on Kp index. Related Articles | Metrics | Comments（0） Cited: Baidu(60)

Select

STUDY ON KEY PROCESSES AFFECTING RAPID CHANGES IN THE ARCTIC ADVANCES IN POLAR SCIENCE    2003, 15 (4): 283-302.   Abstract （1755）      PDF（pc） （669KB）（3227）       Knowledge map    Save Recent evidences show that a rapid change has occurred in the Arctic since the last half century. Temperature increased 2-3 °C in some regions of the Arctic continents. Coverage of sea ice decreased 5% in the Arctic Ocean, thickness of sea ice shrunk in the center of the Arctic Ocean, the surface and intermediate water layers are freshening and warming, absorption of the atmospheric CO 2 increased in the marginal sea ice zone, and depletion of ozone appeared and ultraviolet radiation increased. To understand processes of air sea ice interaction and their impacts to global change, First Chinese National Arctic Research Expedition was conducted from July 1 to September 9 of 1999 to implement a multidisciplinary survey in the Chukchi Sea, the Canada Abyssal Plain, and the Bering Sea. Advancement has achieved to understand regional characteristics of the Arctic and the sub Arctic as well as their effective processes on global change. A phenomenon of persistent warming has been observed in the medial layer waters in the Canada Abyssal Plain where has also been found as a major sink of fresh water from rivers to the Arctic Ocean. Exchange of water masses between the western Arctic Ocean and the Bering Sea as well as warm water structure in secondary surface layers were studied. Using data from multidisciplinary investigations on a floating packed ice, the atmospheric boundary layer was characterized, variations of energy balance on the underlying surface were modeled, and as air sea and ice air turbulent fluxes were calculated respectively, as well as differences of their parameters in the boundary layer were discussed. Fluxes of air sea CO 2 showed that most of the surveyed waters would play as a sink of the atmospheric CO 2. Higher biological pump operations presented in the western Arctic Ocean with an effective organic carbon sink in the Chukchi Sea. Microbiological activities didn′t find remarkably suppressed even in the cold waters. Biological processes of iodine in the surveyed sediment cores indicated a trend of concentration distribution increases from low to high latitude, suggesting a potential sink of iodine in the Arctic region and implying iodine as a significant indicator for variations of paleooceanic geochemical elements in the polar regions. There was a diversity of community and a variety of ecological structure in the Chukchi Sea or the Bering Sea, but a higher nutrient and low chlorophyll (HNLC) appeared in the Bering Abyssal Basin and lower levels of primary production and particle organic matters occurred in summer sea ice melting season in the Chukchi Sea. Pb in marine aerosols over the Chukchi Sea showed a high concentration. Ozone concentrations in the surface air or their daily change magnitude decreased with increase of latitude, which could be attributed to impacts from climate system such as from a warm high passed or a change of the tropopause height. Related Articles | Metrics | Comments（0） Cited: Baidu(24)

Select

THE IDENTIFICATION AND COMPARISON OF THE BIO-ELEMENTS OF THE ORNITHOGENIC SEDIMENT SAMPLE FROM DAVIS STATION AND GREAT WALL STATION,ANTARCTICA ADVANCES IN POLAR SCIENCE    2007, 19 (4): 247-254.   Abstract （2222）      PDF（pc） （427KB）（3217）       Knowledge map    Save During CHINARE-22(from December,2005 to March,2006),a lake sediment core named DG4,which contains penguin droppings,was collected from GD2 lake on the Gardner Island near Davis Station,East Antarctica.In this paper,we determined the concentrations of characteristic elements in the ornithogenic sediment,local bedrock and fresh penguin droppings.P,Se,F,S,As,Sr and Cu in DG4 were identified as bio-element assemblage by R-clustering analysis and compared with those in the local bedrock and fresh droppings.The results are similar to Y2 in Ardley Island,West Antarctica.On this basis,P and Se were identified as the optimum bio-elements in DG4,and F,P and S were identified in Y2,respectively.This provides the foundation for studying the past penguin populations in East Antarctica and the comparison of penguin populations between East and West Antarctica. Related Articles | Metrics | Comments（0）

Select

A STUDY ON THE MULTISTRATEGYBASED INTEGRATION OF POLAR REMOTE SENSING INVERSION MODEL HE Ya-Wen, YANG Xiao-Mei, GAO Xi-Zhang, ZHU Jian-Gang, LIU Jian ADVANCES IN POLAR SCIENCE    2011, 23 (1): 49-55.   DOI: 10.3724/SP.J.1084.2011.00049 Abstract （2850）      PDF（pc） （3448KB）（3217）       Knowledge map    Save Remote Sensing Inversion Model is a very important tool for polar research. This  paper points out the importance of remote sensing inversion model for polar res earch,and analyzes the characteristics of the remote sensing inversion mode. Sub sequently,this study proposes the integration architecture of remote sensing inv ersion model based on the targets of sustained,business and integration access. Based on the integration architecture,this study put forwards the multistrateg ybased model modification and encapsulation method,and the integration models of remote sensing inversion model are discussed in detail from three aspects. Fi nally,experimental remote sensing inversion models are modified and encapsulated  based on the EXEbased model modification and encapsulation method,and the int egration prototype system of remote sensing model is constructed,using the appli cation side model integration model,and the accuracy of integration methods is v erifier by the sea ice density inversion model. Related Articles | Metrics | Comments（0）

Select

PROGRESS OF PREDICTION OF THE GLOBAL CRYOSPHERE CHANGE ADVANCES IN POLAR SCIENCE    2008, 20 (3): 275-286.   Abstract （1886）      PDF（pc） （967KB）（3031）       Knowledge map    Save The modeling simulation and modeling prediction of each component (sea ice,snow and frozen ground,ice sheet and shelves,glacier and ice cap,lake and river ice) of the Cryosphere is reviewed. Firstly,the ability of the modeling simulation to reproduce each component’s changes observed during the last decades is investigated. Secondly,the reliability of the modeling prediction to project over the 21st century is assessed. The conclusion is drawn: the seasonal and interannual variability of some components (eg. sea ice) observed on the large scale is successfully reproduced by current models,and the ability of simulation is greatly improved. On the other hand,the dynamical and thermal process of some components (eg. ice sheet) is not well represented in models,even some components' (eg. river ice) models are based on statistics. The development of models is not equivalent among the cryosphere components. The uncertainty of current simulation and prediction of global cryosphere by models always exist. All the uncertainty is mainly from the detail of physical process which is poorly understood. The physical process and observation research on cryosphere components is urgently needed. Reference | Related Articles | Metrics | Comments（0） Cited: Baidu(6)