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1.
1 IntroductionAtlatitudesaround 80°Nandinthemesosphere /lowerthermosphere (MLT) ,therehavebeenfewmeasurementsofneutraldynamics.ArequirementwasseenforlongtermcontinualmonitoringandaVHFmeteorradarwasidentifiedasbeingamostsuitableinstrument.RadarsliketheEISCA…  相似文献   

2.
1 IntroductionAlongwiththearrivalof2 3rdsolaractivepeakandthedevelopmentofthespacesci ence ,thescientistsaremoreandmoreinterestedintopicsofgeospaceeffectscausedbytheintensesolaractivities.Thegeospaceeffectsofseveralextremesolaractiveevents,suchasthe 1 993No…  相似文献   

3.
1 IntroductionThepolarregionisanimportantareaforenergeticcouplingbetweensolarwindandearth’smagnetosphere .Thecuspisthedirectpathforsolarwindpenetratingintothemagnetosphereorevenintotheionosphereanditalsoisaconvergentregionforalotofmagnetosphericbounda…  相似文献   

4.
1 INTRODUCTIONAsanimportantcomponentoftheglobalterres trialecosystems ,forestlinkstheatmosphere ,soilandwatertogetherthroughitspowerfulecologicalfunc tion .Inrecentyears,owingtotheglobalwarmingandhumaninfluence ,forestfireoccurmuchmorefrequently .Theannualf…  相似文献   

5.
1 IntroductionArcticclimateandenvironmentareveryimportantintheglobalchangesystems(WMO/UNEP 1 990 ;WMO 1 991 ) .Observationsandmodelingresultsindicatethattheglobalwarmingwillbeenhancedinthepolarregions ,especiallyintheNorthHemi sphere ,withapredictedwarmingofabout…  相似文献   

6.
DIMETHYLSULFIDE IN THE SOUTH CHINA SEA   总被引:1,自引:0,他引:1  
INTRODUCTIONGreateffortsweredevotedrecentlytostudyingdimethylsulfide(DMS)distributioninseawater,asitaccountsforthemajorpartofthesulfurfluxfromtheoceanstotheatmosphere.Moreover,itsoxidationproductsintheatmospheremayinfluenceenvironmentalacidificationand…  相似文献   

7.
THE RESUSPENSION RATE OF SEDIMENTS IN 32°N SECTION ON THE EAST CHINA SEA   总被引:1,自引:0,他引:1  
INTRODUCTIONThe“greenhouseeffect”resultingfromtheincreasingcarbondioxideintheatmospheresignifi cantlyaffectstheglobalaveragetemperature (Deter,1 978) ,hasdrawntheattentionofscientistsaroundtheworld .Scientistsconsiderthatknowledgeoftheocean’scapacitytoabsor…  相似文献   

8.
I.INTRODUCTIONSoilrespirationisCO2evolutionprocessfromsoiltoatmosphere.Itismainlyproducedbyoxidizingorganicmaterbymicroorgan...  相似文献   

9.
INTRODUCTIONTheAsiansummermonsoonsystemincludestheIndian(orSouthAsian)andEastAsiansummermonsoons,bothofwhichformthemostdramaticmonsoonsystemsintheNorthernHemisphere.TheintensityofthelatterappearstoberelatedtotherainfallineasternChina.Therewillbeanempty…  相似文献   

10.
1 TheincoherentscattertechniqueTheuseofincoherentscatterradarsasapowerfulground baseddiagnostictoolforstudyingthenear EarthspaceenvironmentbeganwiththefirsttheoreticalpredictionsbyGordon( 1 958) ,andthefirstobservationsbyBowles( 1 958)afewmonthslater .Thereares…  相似文献   

11.
A study has been done on the comparison of nesting and feeding behavior, population variances as well as breeding success between two populations of south polar skua (Catharacta maccormicki) from near Great Wall station on Fildes Peninsula and near Zhongshan station in Eastern Larsemann Hills, Antarctica. There are evident differences in their population ecology. The foraging habit is much related to regional ecosystem and food resources near their territorial area. Dependence on human food waste influences skua‘s diet,which considerably affects their behavior even population variation in both areas. The skuas in Zhongshan Station,could shorten and/or regulate the timing for their egg laying and hatching, and take precedence of one chick brooding, for keeping their breeding success, and subsequent species continuation.  相似文献   

12.
基于BDS、GPS系统的星座结构,对当前的BDS二代导航系统(BD2)、全部建成后的BDS系统在极地科考站(黄河站、昆仑站、中山站、长城站)和北极圈的可见卫星数、DOP值、定位精度等进行评估,并将建成后的BDS、GPS及其组合系统在南/北极的基本定位性能进行对比分析。仿真结果表明,当前的BD2只实现了极地的部分覆盖,对极地提供导航定位的能力有限,大范围内的定位精度大于30.0 m; BDS在极地的定位精度将与GPS相当,可见卫星数可达13颗左右,PDOP值优于1.6,定位精度优于8.0 m;GPS/BDS组合后在极地的PDOP值优于1.4,定位精度优于6.0 m。
  相似文献   

13.
1 IntroductionTheAuroralStationinAdventdalenwasbuiltin 1 978andhasworkedasanopticalsiteforground -basedobservationsofthedaysideandnightsideaurorainthepolarcap .Figure 1showsaphotographofthestationtogetherwithatypicalstormtypeaurora(Simmonsetal.1 996) .Thestatio…  相似文献   

14.
�ϼ���ɽվ���ݴ�����IGS���վ��ѡ��   总被引:2,自引:0,他引:2  
?????????2007???1????100????????????????????GPS??????????????IGS????????????????????????????????????У???IGS???????????????????Ρ??????Z?????????????????4??????????????????ó?????????????в?NRMS???????????????????????????????4???????????????ó????????????????????????GPS?????????????????????ο???????????????????5??????????δ?????Χ??IGS????????????δ??????????????????????????????????????????????Z???????????  相似文献   

15.
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   

16.
????2000??2006?????????GPS?????????о??????????TEC????????????????????????????仯?????????????????GPS??TEC????????????????????????仯???????????????????TEC?仯?????????????????????????????????????????????????  相似文献   

17.
Characteristics of metals in the aerosols of Zhongshan Station, Antarctica   总被引:1,自引:0,他引:1  
Instrumental neutron activation analysis (INAA) was applied to analyze the bulk, high-volume aerosol samples, collected at Zhongshan Station in the Eastern Antarctica, during 1998-2001, to study the chemical species. .A graphical technique was applied to the INAA data. Results showed that Na, Cl, Mg, Ca, Sr, Br, I, Sr and Rb were marine elements while Al, Sc, Fe and Mn were crustal elements. Compared to marine and crustal elements, five elements (Se、Co、Sb、Zn、Cr) were highly abundant in the aerosols collected at Zhongshan station, which indicated that they might come from the petroleum burning, heating and equipment operation. The presence of pollutant elements suggested that human activities have affected the local environments in Antarctica.  相似文献   

18.
Dome A is the highest ice feature in the Antarctica,up to now,little is known about surface topography at Dome A.The first Chinese ITASE expedition was carried out from Zhongshan station to Dome A during the 1996/1997 austral summer. During the 2004/2005 austral summer,the traverse was extended to the summit of Dome A which is 1228 km from Zhongshan Station by 21st Chinese National Antarctic Research Expedition (CHINARE).The real-time kinematic (RTK) GPS survey was carried out in the summit of Dome A dur...  相似文献   

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