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1.
王清华 《极地研究(英文版)》2003,14(1)
1 IntroductionFromitsoriginalformulationin 1 990 ,theInternationalTrans AntarcticScientificExpedition (ITASE)hashadasitsprimaryaimthecollectionandinterpretationofacon tinental widearrayofenvironmentalparametersassembledthroughthecoordinatedeffortsofscientistsfromseveralnations(Mayewskietal.1 996) .AsaconsequenceITASEhasbeenfocusedtoaddresstwokeyscientificobjectives:1 )Todeterminethespatialvariabil ityofAntarcticclimate (eg.accumulation,airtemperature,atmosphericcirculation)overthelast2… 相似文献
2.
1 Introduction The Grove Mountains is located at Princess Elizabeth land in East Antarctica, about 400 km from Zhongshan station and 160 km east of the Mawson Escarpment, consists of a scattered group of mountains and nunataks. The range extends73°-76°E… 相似文献
3.
LIU Jiying WEN Jiahong WANG Yafeng WANG Weili Beata M CATHSO Kenneth CJEZEK 《中国地理科学(英文版)》2007,17(2):160-165
Dome A, the highest dome of East Antarctic Ice Sheet, is being an area focused by international Antarctic community after Chinese Antarctic Expedition finally reached there in 2005, and with the ongoing International Polar Year (IPY) during August 2007. In this paper two data processing methods are used together to generate two 100-m cell size digital elevation models (DEMs) of the Dome A region (Dome A-DEM) by using Cokriging method to interpolate the ICESat GLAS data, with Ihde-DEM as a constraint. It provides fundamental data to glaciological and geophysical investigation in this area. The Dome A-DEM was applied to determining the ice-sheet surface elevations and coordinates of the south and north summits, defining boundaries of basins and ice flowlines, deducing subglacial topography, and mapping surface slope and aspect in Dome A region. The DEM shows there are two (north and south) summits in Dome A region. The coordinate and the surface elevation of the highest point (the north summit) are 80°21′29.86″S, 77°21′50.29″E and 4092.71±1.43m, respectively. The ice thickness and sub-ice bedrock elevation at north summit are 2420m and 1672m, respectively. Dome A region contains four drainage basins that meet together near the south summit. Ice flowlines, slope and aspect in detail are also derived using the DEM. 相似文献
4.
利用Bedmap2数据与中国第29次南极科学考察期间获取的冰雷达数据,在中山站至Dome A断面的Gamburtsev山脉地区首次构建11.3 km×11.5 km南极局部冰盖三维模型。着重介绍三维模型建立过程中的数据处理,其中冰雷达数据采集首次采用中国自主研发的冰雷达系统。详细阐述了冰雷达数据的处理流程,包括数据预处理、常规图像修正技术以及冰下地形获取,得到冰下基岩埋深和冰盖内部等时层埋深,插值得到100 m分辨率的冰下基岩DEM（海拔1 729 m~2 718 m）和等时层DEM（海拔2 601 m~2 950 m）,利用南极Bedmap2冰表面栅格影像得到100 m分辨率的冰盖表面DEM（海拔3 679 m~3 745 m）。结合冰盖内外部数据处理结果,构建包含冰盖表面、冰盖内部等时层和冰下基岩地形特征的三维模型,并对模型进行检验,对冰盖内外部地形特征进行初步分析。 相似文献
5.
A preliminary application GIS in glaciological research along the traverse route from Zhongshan Station to Dome A, Antarctica 总被引：1，自引：0，他引：1
1 IntroductionGeographicalinformationsystem (GIS)isanefficientwayandimportanttechniquetomanage,displayandanalyzeAntarcticspatialdata.GIScanbeusedtomakeandre newmapproductsquickly ,evaluateenvironment,supportlogisticmanagementandfieldoperation,providechancetoextractnewknowledge,andtopromoteinformationex changeamongnationsunderthedemandoftheMadridProtocol(AADC 2 0 0 1 ;MAGIC1 998;1 999) .WorkingGroupofGeodesyandGeographicInformation (WG GGI)ofScientificCommitteeonAntarcticResearch (… 相似文献
6.
利用高频GPS数据长基线双差精密定位技术,获取2011年3月日本Mw9.0强震近场和远场GPS连续参考站的瞬时动态形变。分析表明：距震源较近的IGS站（USUD）的同震动态形变水平方向幅度超过60 cm,震后水平形变达到30 cm;位于远场的GPS连续参考站（JLYJ）的动态形变,清晰地给出了地震面波引起的地表形变波形。对JLYJ站的谱分析表明,地震面波引起的动态形变周期为10～17 s,并出现了两次峰值,东西向和垂向上的动态位移量远大于北南向,说明JLYJ站的形变主要由Rayleigh波及其谐波所主导,Rayleigh波的传播速度为3.5 km/s,波长约50 km。 相似文献
7.
设计了位移形变模拟试验场并进行位移形变模拟试验,利用Bernese 5.0软件的单历元单点定位功能,处理并分析了位移模拟形变试验获取的1 Hz GPS数据.并以2008年5月12日汶川地震为例,获取了震中附近3个GPS站(成都、简阳和郫县)震前的短临位移过程及震后短时间的动态时变序列,结果显示各站的形变结果在时间上具有很好的一致性.利用动态时序的地震波到时和震中距离估计地震波地壳平均速度为3.17 km/s. 相似文献
8.
??????????????Χ??GPS??????????????з?????????t???????λ?????????α?????50 km??Χ????GPS????α???????????????????70 mm????????????30 s???????λ??????????????????α????????λ???????????У???С?????о???????????????29 km????????λ???21 mm????????150 km???λ???1??2 mm????GPS???????α????????????????????????????????????????????λ?????и???20 km????????廬?????0.6 m??GPS????????α??о????????????????????????????????ε????????????????? 相似文献
9.
����TRACK����GPS����Ԫ��λ 总被引：5，自引：0，他引：5
????GPS??????????GAMIT?е???????λ??飨TRACK??????1 Hz??3 s??????GPS?????????????ж?λ??????????????????????????????????????????????????????30 s??????1Hz???????????????????С??10 km??10~100 km??????????100 km 3????????д??????λ??????????????????????????????????????????￡??????λ???????????????????5 mm?? 相似文献
10.
Based on the field data acquired in the program of fast ice observation off Zhongshan Station, Prydz Bay, East Antarctica during the austral summer 2005/ 2006, physical properties evolution of fast ice during the ice ablation season is analyzed in detail. Results show that the annual maximum ice thickness in 2005 occurred in later November, and then ice started to reek, and the ablation duration was 62 days; sea water under the ice became warmer synchronously; corresponding to the warming sea ice temperature, a ＂relative cold mid-layer＂ appeared in sea ice; the fast ice marginal line recoiled back to the shore observably, and the recoil distance was 20.9 km from 18 December 2005 through 14 January 2006. In addition, based on the data of sea ice thickness survey along the investigation course of MV Xuelong on December 18 of 2005, the ice thickness distribution paten in the marginal ice zone have been described ： sea ice thickness increased, but the diversity of floe ice thick-ness decreased from open water to fast ice zone distinctly. 相似文献
11.
The heights of automatic weather station (AWS) sensors over the Antarctic ice sheet are nominal and change with snow accumulation or ablation. Therefore, the measured data may not be used directly. In this study, we analyzed the impact of snow accumulation on AWS observations using continuous measurements from three AWS that were deployed on the traverse route from the Zhongshan Station to Dome A over East Antarctica. We then corrected the measured air temperature to account for changes in the sensor height relative to the snow surface to improve the authenticity and representativeness of the observation data from the AWS. The results show that (i) the annual mean snow accumulations at Dome A, Eagle and LGB69 were approximately 0.11 m, 0.30 m and 0.49 m, respectively, and the corresponding annual mean air temperature differences between the corrected and measured values at 1 m in height were 0.34℃, 0.29℃ and 0.35℃; (ii) the impact on air temperature from accumulation decreases with height from the surface; (iii) the air temperature difference between the corrected and measured values was not directly proportional to the snow accumulation but was related to the seasonal air temperature variations and the intensity of the local surface inversion; and (iv) the averaged corrected air temperature was higher than the measured values except during the summer when there were days without temperature inversion. The magnitude of the temperature difference between the corrected and measured was mainly determined by snow accumulation and the intensity of the local surface inversion. 相似文献
12.
During the Austral summer of 1996/1997, the First Chinese Antarctic Inland Expedition reached the inland area about 330 km along the direction around 76°E from Zhongshan Station, and collected 84 surface snow samples at an interval of 4 kin. Micro-particle analysis of the samples indicates that the micro-particle concentration apparently decreases with the increasing of altitude, and the amplitudes of micro-particle concentration is much larger in the lower altitude than in the higher altitude. Further analysis of grain-size distributions of micro-particle, percentage of micro-particles from different sources and variations with altitude suggest that microparticles in this area are from a considerably dominant source. Although this area is controlled by polar easterly wind and katabatic wind, transportation and deposition of the micro-particles are mainly influenced by marine transportation in coastal area. 相似文献
13.
在组合PPP函数模型分析的基础上，采用CNES提供的多系统实时轨道和钟差信息，实现GPS/Galileo组合单双频实时静动态PPP，并选取10个MGEX站10 d的观测数据进行解算分析。结果表明，单双频实时静态PPP中，GPS/Galileo组合的定位精度略优于单纯的GPS；单双频实时动态PPP中，GPS/Galileo组合具有较好的定位效果。相较于单纯的GPS，GPS/Galileo组合单频PPP在E、N、U方向平均精度为10.6 cm、9.8 cm、22.5 cm，分别提高了5.4%、4.9%、10.4%；双频PPP在E、N、U方向平均精度为4.3 cm、2.9 cm、7.0 cm，分别提高了6.5%、6.5%、5.4%。同时，GPS/Galileo组合PPP较GPS在收敛时间方面也有一定的改善。 相似文献
14.
提出基于单观测值的Kalman滤波快速计算方法，并引入共享存储并行编程（OpenMP）技术实现协方差快速更新，从而实现非差GPS卫星钟差的快速实时计算。均匀选取55个IGS参考站，计算2017-03-20~03-30采样率为60 s的卫星钟差。与IGS事后30 s钟差相比，两者具有很好的一致性，RMS互差优于0.5 ns。选取未参与钟差解算的10个IGS参考站进行精密单点定位，结果表明，实时静态PPP水平方向精度优于2 cm，高程方向精度为2~4 cm；实时动态PPP水平方向精度为2～4 cm，高程方向精度为4～6 cm，能够满足实时PPP的精度要求。该方法在主频1.2 GHz服务器上8线程并行模式下单历元耗时4 s，相比串行模式效率提升1/3。 相似文献
15.
GPS实时单站测速和相对测速的误差比较与精度分析 总被引：1，自引：0，他引：1
基于GPS多普勒测速原理，结合广播星历介绍实时单站测速和相对测速的数学模型，分析并对比两者的误差源及其对测速精度的影响，然后采用实测数据进行静态环境下和低动态环境下测速精度的实验验证。结果表明，在基线长度约为600 km的静态环境下，采用原始多普勒观测值相对测速精度和单站测速精度都为cm/s级，且相对测速RMS值大于单站测速RMS值；采用高频相位导出多普勒观测值两种测速模式的精度都为mm/s级，且相对测速RMS值略小于单站测速RMS值。在低动态环境下，采用原始多普勒观测值两种测速模式精度都为dm/s级，采用高频相位导出多普勒观测值两者精度都为cm/s级。 相似文献
16.
Surface meteorological observations have been carried out at the Great Wall station (GW) and Zhongshan station (ZS) from 1984 to 2008 and from 1989 to 2008 respectively. The variation in mean air temperature and its trends are derived from the meteorological observation data recorded at both stations. The warming rate of the annual mean temperature at GW is similar to that at Bellingshausen station, which is about 3 km distant. Thus, the warming trend is representative of the King George Island region. The warming rate of ZS is less different from that at Davis station,which is about 100 km from ZS. It can be said that the meteorological data recorded at both stations are representative of the regions of the King George Island and east coast of the Antarctic. 相似文献
17.
利用青海省CORS网GPS连续观测数据获取2021年玛多MW7.4地震的同震形变场以及震时地表运动状态。结果表明,断层南北两侧的近场测站分别展现出南东向和北西向运动,符合左旋走滑机制。同震形变集中在震中距300 km范围内,震中距150 km以内的站点均能反映出cm级的位移,最大水平向位移为28.3 cm(JDUO站)。高频GPS动态形变提取出的永久位移与静态解算结果相当,其动态波形最大峰值为49.9 cm(KANQ站)。依据震中距和波形初动时间估计得到地震波速为2.8~4.9 km/s,断层东端的站点估算速度大于其他站点,可能与此次破裂的方向性或者破裂传播速度有关。依据震级经验公式,动态波形估算震级在M6.8~7.6区间,拟合平均震级为M7.35±0.15。若在实时条件下,震后70 s内可得到稳定的震级。 相似文献
18.
���ÿ���-λ��ģ�ͷ��ݻ������������˶��Ͷ��ѻ 总被引：1，自引：0，他引：1
?????????1999??????GPS?????????д??????????GPS?????????????????????媲λ?????????????????????????????????????????????????????о???????????????壬?о????????????????????С????????????????????????????????????????????????????????????????????????1 mm/a?????κ???α????????????????????????40 km??30 km???????????????????????????????????????1 mm/a??????????????30 km????????????????????????????????1 mm/a?????????????????40 km?? 相似文献
19.
KUO Ying-Hwa 《中国海洋大学学报(英文版)》2012,11(2):118-128
Characteristics of cyclones and explosively developing cyclones (or ’bombs’) over the Southern Ocean in austral summer (December, January and February) from 2004 to 2008 are analyzed by using the Final Analysis (FNL) data produced by the National Centers for Environmental Prediction (NCEP) of the United States. Statistical results show that both cyclones and explosively developing cyclones frequently develop in January, and most of them occur within the latitudinal zone between 55°S and 70°S. These cyclones gradually approach the Antarctic Continent from December to February. Generally cyclones and bombs move east-southeastward with some exceptions of northeastward movement. The lifetime of cyclones is around 2-6 d, and the horizontal scale is about 1000 km. Explosive cyclones have the lifetime of about 1 week with the horizontal scale reaching up to 3000 km. Compared with cyclones developed in the Northern Hemisphere, cyclones over the southern ocean have much higher occurrence frequency, lower central pressure and larger horizontal scale, which may be caused by the unique geographical features of the Southern Hemisphere. 相似文献
20.
用GPS资料研究华北地区形变场和构造应力场 总被引：5，自引：2，他引：3
利用华北地区地质构造、第四纪以来的活动断层、地形、地壳厚度、地壳及上地幔地震波速度结构等资料,构建了三维有限元框架模型,利用最新GPS观测结果作为边界约束条件,模拟计算了华北地区的形变场及构造应力场。结果表明,模型预测地表速度场和GPS观测结果比较一致。模拟结果中,大型NNE向断层如汾渭地堑断裂系呈右旋运动,NWW向断层如张家口渤海断裂带呈左旋运动,与野外地质考察结果一致。在地表以下10～20km处,模型预测应力场的主压应力方向为NNE、EW向,主张应力大约为主压应力2～8倍。模型中最大剪切应力场在山西、华北平原中部和东部沿海分别出现3条NNE向高梯度带,此梯度带与研究区域的主要地震活动带相对应。 相似文献