简介：

简介：在这研究，越过从1956～2004的中国的最大的风速度(WSmax)变化基于观察车站数据被分析，并且为20462065和20802099的WSmax的变化用三个全球气候模型被投射(GFDL_CM2_0，CCCMA_CGCM3，并且MRI_CGCM2)那参予了IPCC第四份评价报告(AR4)。观察到年度、季节的WSmax和强风天的频率显示出明显的衰退趋势。年度WSmax每十年由约1.46ms1减少了，并且强风天的数字从1956～2004每十年到3.0天减少了。年度、季节的WSmax减少的振幅比年度、季节的平均的风速度(WSavg)的那些大。变弱东方亚洲冬季和夏天季风在整个中国上是为WSmax和WSavg的不同减少的原因。在东南的WSmax的减少中国的沿海的区域与在中国和减少的数字的冷波浪的减少的紧张有关(并且减少的紧张)land-falling，台风在西北太平洋发源。全球气候模型GFDL_CM2_0，MRI_CGCM2，和EBGCM(上面的整体提及三个全球气候模型)一致地建议年度、季节的WSmax价值将相对19812000在20462065和20802099期间减少。模型也建议在为整个中国的WSmax的减少在20462065和20802099期间与冷波浪的减少的紧张和冬季季风的减少的紧张有关，并且在在东南的WSmax的减少中国的沿海的区域在一样的时期期间相应于在在夏天的西北太平洋上的热带气旋的减少的数字。

简介：统计downscaling的二条途径在19602008期间在夏天在北京车站基于每日的最大、最小的温度观察的百分位数被用于温度极端的索引。一个人到过由起初使用文件结束分析和逐步的线性回归的下阶层的每天最大、最小的温度，然后计算极端的索引；其它到过直接下阶层由使用季节的大规模温度和geo潜在的高度记录的基于百分位数的索引。交叉验证结果证明后者途径比前者有更好的表演。然后，后者途径在北中国被用于48个气象学的车站。所有48个车站的交叉验证结果显示出在基于百分位数的索引和季节的大规模变量之间的靠近的关联。最后，在北中国的温度极端的索引的未来情形被把统计downscaling用于哈德利中心投射联合模型版本3(HadCM3)在代表性的集中小径下面的模拟4.5(RCP4.5)第五的情形联合了模型内部比较的工程(CMIP5)。结果证明每日的最大的温度的第90百分位数将在所有地s珀?珀由大约1.5talSe增加吗？？

简介：Monitoringofsubsurfacefluid(undergroundfluid)isanimportantpartofeffortsforearthquakepredictioninChina.Thenationwidenetwork,whichmonitorsgroundwaterlevel,watertemperature,andradonandmercuryingroundwater,hasbeenconstructedinthelastdecades.Largeamountsofabnormalfluidchangesbeforeandaftermajorearthquakeshavebeenrecorded,providingpreciousdataforresearchinearthquakesciences.Manystudieshavebeendoneinearthquakefluidhydrogeologyinordertoprobethenatureoftheearthquake.Muchprogressinearthquakefluidhydrogeologyhasbeenmadeinthelastdecades.Thepaperprovidesareviewoftheadvancesinresearchonearthquakefluidhydrogeologyoverthelast40yearsinChina.Itdealswiththefollowingfiveaspects:(1)anintroductiontothedevelopmenthistoryofmonitoringnetworksconstruction;(2)casesofdifferentsubsurfacefluidchangesrecordedbeforesomemajorearthquakeswhichoccurredinthelastdecades;(3)characteristicsofsubsurfacefluidchangesfollowingmajorearthquakes;(4)mechanismofsubsurfacefluidchangesbeforeandfollowingearthquakes;(5)applicationofearthquakefluidsinthehydrogeologyfield.

简介：尽管有快速的都市化，在城市的区域的超过2亿人生活仍然作为农业被登记并且为在瓷器Hukou下面的很社会的好处是不合格的(或家庭登记)系统。这份报纸为基于三指示物在城市的中国解决农村候鸟识别地区性的适用性(改编的重新安居的社区的紧急，技巧和能力的度，和到支持的政府的能力那再定居)。它从县水平花2008政府社会经济的数据进考虑。空间，统计，并且决定树分析，由社会科学统计套装软体，Geodata，和ArcGIS软件支持了，有五张分开的人口的表演打字，有适用性的不同的度的各个。这些包括高度合适的区域，对解决候鸟到外面的区域合适的区域，对从外面的区域解决候鸟合适的区域，有中等潜在、不合适的区域的区域。这份报纸建议为解决农村候鸟的地区性的政策是有意义的，自从五个区域独立相对是分布式的。由于为越过区域的不同身体的适用性，相等的处理应该越过县和省被用于本国的候鸟和那。而且，社会福利辨别的破坏遵守了Hukou系统和服务将活跃地并且稳定地比所谓的安定农村候鸟具有更多的实际意义的基本公众的均等。

简介：Overthepast25years,anannualaverageof6to7tropicalcyclones(TCs)madelandfallonChinamainlandandHainanIslandwithanaverageintensityof29.9m/satlandfallandmaintainedatleasttropicalstormintensityfor15.6hoursoverland,leadingto505deathsand37billionyuanindirecteconomicloss,whichaccountedfor0.4%oftheannualGDPofChina.Althoughtherewaslittlechangeintheoveralllandfallfrequency,intensityatlandfallandoverlandduration,theannualtotaldirecteconomiclossincreasedsignificantlyduetotherapideconomicdevelopmentoverthepast25years.Underglobalwarming,theintensityofTCsthatmadelandfallonHainandecreasedbuttheoverlanddurationandfrequencyofTCsthatmadelandfallonFujianandZhejiangincreased.Atthenationalandprovinciallevels,theratioofthedirecteconomiclosstoGDPandcasualtiescausedbylandfalltropicalcyclonesdecreased,suggestingtheeffectivenessofdisasterpreventionandreductioninChina.

简介：Progressesintheresearchforseasondivisionandseasonalchangesarereviewedsystematicallyinthispaper,whichparticularlyintroducestheresultsofanationalnaturalsciencefoundationproject,'thenonlinearidentificationofseasonalchangesanditsresponsestoglobalwarming'.Theprojectdevelopedtwoobjectiveandquantitativemethodsforseasondivision:thenon-linearsimilaritymeasure(NSM)methodandtheregionalmulti-elementoptimaldissection(RMOD)method,whichdifferfromtraditionalonesforseasondivision.Besides,theprojectfurtherinvestigatedseasonalchangesandtheirresponsestoglobalwarming,analyzedevolutioncharacteristicsofthestartingdateandlengthofseasonsinhistory,revealedtheirrelationshipswithextremeeventsandprecipitationpatternsinrainyseasons,andtherebybuiltaresearchsystemforseasonalchangesinChinaundertheglobalwarmingbackground.Finally,theauthorsmakeanoutlookontheresearchforseasondivisionandseasonalchangesandputforwardseveralissuesassociatedwithseasonandclimatechangesthatneedtobefurtherexplored.

简介：总数的长期的趋势出现太阳的放射(SSR)，表面弥漫的放射，和表面空气温度在在SSR之间的中国，然后关联从55个观察车站基于更新的48年的数据在这研究被分析并且日报温度范围(数据终端就绪)被学习。在中国的表面空气温度上的全部的太阳的放射的效果根据上述分析被调查。在SSR和数据终端就绪之间的强壮的关联被作出对有利的裁决时期19612008在中国。最高的关联和最陡峭的回归线斜坡发生在冬季，显示数据终端就绪上的太阳的放射效果在这个季节是最大的。云和水蒸汽在SSR和数据终端就绪上有强烈影响，并且因此在他们的关系上。在SSR和数据终端就绪之间的最大的关联在北中国发生在冬，不管全天(包括的晴朗的天和多云的天)或清楚天的案例。我们的结果也证明放射在表面到达中国在19611989期间显著地减少了(dimming时期)，但是开始在19902008期间增加了(使明亮的时期)，与以前的全球研究一致。全部的SSR的减小部分抵消在19611989期间温暖的温室。随在1990以后的SSR的增加，然而，这抵消的效果消失了；相反，它甚至做了贡献到加速的温暖。尽管如此，因为在19612008的整个学习时期增加最小、吝啬的表面温度，温暖的温室仍然起了一个控制作用。我们估计温室气体可能独自引起了表面温度上升0.310.46

简介：这研究调查了通过确定、概率的预报在华南在2007年4月23日与伪静止的前面联系的一根嚎啕线的可预测性。我们的结果证明嚎啕线模拟是很敏感的在物理parameterization计划从水平分辨率和无常为错误建模。至少一种10-km格子尺寸是必要的高雅地捕获这根嚎啕线。有4.5km的一种格子尺寸的模仿的嚎啕线对相对象微视物理学和行星的边界层那样的另外的物理计划的长波浪的放射parameterization计划很敏感。为从20～5km的一种格子尺寸，一个积云parameterization计划降级了嚎啕线模拟(相对关掉它)，与到格子尺寸的更严重的降级<10km比>10km。到起始的错误的嚎啕线模拟的敏感通过整体预报被调查。嚎啕线的整体模拟的表演对起始的错误很敏感。约15%整体成员高雅地捕获了嚎啕线的进化，25%失败了，并且60%打乱了嚎啕线。用物理parameterization的不同联合，为不同成员的计划能改进概率的预报。这个案例的铅时间仅仅是一些小时。错误生长清楚地与潮湿的传送对流开发被联系。当起始的错误逐渐地被减少时，在嚎啕线模拟的性能的线性改进被观察，与来自起始的潮湿地的最大的贡献。

简介：在西南中国的云南的低纬度高地的降水政体服从于在东方亚洲夏天季风和印度夏天之间的相互作用表面山志学的季风，和影响。在它的空间、时间的模式的变化的理解着急地为气候变化设计，水文学影响建模，和地区性、下游的水资源管理被需要。用在最后几十年(1950s2007)的低纬度高地的每日的降水记录，降水的一个时间系列索引，包括年度降水，多雨的天的数字，吝啬的年度降水紧张，雨季的发作的日期，降水的度和时期季节的集中，最高1天、3天、7天的降水，和降水在不同紧张上面为降水多雨的天总计并且数(例如10公里，25公里一没有趋势的预先增白的Mann-Kendall趋势测试然后被用来检测时间系列数据的趋势。结果证明在年度降水和越过低纬度高地的降水趋势的强壮的季节的区别没有重要趋势。弹簧和冬季正在变得更湿，夏天正在变得更干燥。秋天在东方正在变得更干燥并且在西方更湿。作为后果，降水的seasonality稍微正在变弱。雨季和最高的降水的时期的开始趋于更早。同时，低纬度高地也见证不太多雨的天，更强烈的降水，稍微更长中等、重的降水事件，和更经常的极端降水事件。另外，降水趋势的地区性的区别是显著的。这些变化可以与东方亚洲夏天季风变弱并且南方亚洲人夏天季风，以及特殊多山的地面的走廊障碍效果加强被联系。然而，包含的物理机制仍然需要以后被揭开。

简介：PhasecompositeanalysesareconductedtoinvestigatethepossibleeffectoftheMadden–Julianoscillation(MJO)onthespringrainfallanomaliesinEastChinabyusingtheReal-timeMultivariateMJO(RMM)indexfromAustralianMeteorologicalBureau.Theresultsshowthattherainfallanomaliesoverthemid-andlower-valleyofYangtzeRiverarepositivewhentheMJOshiftseastwardtothemid-andeastern-IndianOcean,andanomalousprecipitationoverSouthChinaarepositivewhentheMJOmovesfurthereastwardtothemaritimecontinent,whereasspringrainfallanomaliesoverEastChinaarenegativeintheotherMJOepisodes.TheMJOimpactsontheprecipitationoverEastChinaresultfromthechangesinlarge-scaleatmosphericcirculationaswellasvorticityandwatervaportransportationinthemid-andlower-troposphere.

简介：Interannualvariabilityoflandfallingtropicalcyclones(TCs)inChinaduring1960-2010isinvestigated.Byusingthemethodofpartialleastsquaresregression(PLS-regression),canonicalENSOandENSOModokiareidentifiedtobethefactorsthatcontributetotheinterannualvariabilityoflandfallingTCs.ElNioModokiyearsareassociatedwithagreater-than-averagefrequencyoflandfallingTCsinChina,butreversedincanonicalElNioyears.SignificantdifferenceingenesislocationsoflandfallingTCsinChinaforthetwokindsofElNiophasesoccursdominantlyinthenortherntropicalwesternNorthPacific(WNP).Thepatternsoflow-levelcirculationanomaliesandoutgoinglongwaveradiation(OLR)anomaliesassociatedwithlandfallingTCgenesiswithdifferenttypesofElNiophasesareexamined.DuringcanonicalElNioyears,abroadzonalbandofpositiveOLRanomaliesdominatesthetropicalWNP,whilethecirculationanomaliesexhibitameridionallysymmetricaldipolepatternwithananticyclonicanomalyinthesubtropicsandacyclonicanomalynearthetropics.InElNioModokiyears,avastregionofnegativeOLRanomalies,roughlytothesouthof25°Nwithastronglarge-scalecyclonicanomalyoverthetropicalWNP,providesamorefavorableconditionforlandfallingTCgenesiscomparedtoitscounterpartduringcanonicalElNioyears.FormorelandfallingTCsformedinthenortherntropicalWNPinElNioModokiyears,therearemoreTCsmakinglandfallonthenortherncoastofChinainElNioModokiyearsthanincanonicalElNioyears.ThenumberoflandfallingTCsisslightlyabovenormalincanonicalLaNiayears.EnhancedconvectionisfoundintheSouthChinaSea(SCS)andthewestofthetropicalWNP,whichresultsinlandfallingTCsformingmorewestwardincanonicalLaNiayears.DuringLaNiaModokiyears,thelandfallingTCfrequencyarebelownormal,owingtoanunfavorableconditionforTCgenesispersistinginabroadzonalbandfrom5°Nto25°N.SincethewesternNorthPacificsubtropicalhi

简介：ThemacrobenthiccommunityoftheXiaoqingRiverEstuaryandtheadjacentseawaterswasinvestigatedinMayandNovember2008,August2009,andMayandSeptember2010,respectively.Atotalof95speciesofmacrobenthoswereidentifiedinthefivecruisesandmostofthemwerepolychaetes(46.39%),mollusks(28.86%)andcrustaceans(20.62%).TheShannon-Wienerindexofmacrobenthoswaslowerthan2in67%sites.Alongthestreamchannel,estuaryandthecoastalwaters,thespeciesofpolychaetesreducedgradually,whiletheabundanceincreasedatfirstandthendecreased.Theabundancewasthebiggestatregionswithsalinityof520intheestuary.Thespeciesandabundanceofmollusksandcrustaceansincreasedgradually.Asforseasonaldistribution,thespecies,abundanceandbiomasswerehigherinspringandlowerinsummerandautumn.ContemporaneouslycomparedwithLaizhouBayandYellowRiverEstuary,thespeciesofmacrobenthosappearedintheXiaoqingRiverEstuaryweremuchless,whilethepercentageofpolychaeteswashigher.AbundanceandbiomasswerehigherinXiaoqingRiverestuary,thenconsequentlyfollowedbyLaizhouBayandYellowRiverEstuary.ThedominantspeciesinXiaoqingRiverEstuarywaspolychaete,andLayzhouBaymollusk.ThecommunitystructurecharacteristicsofmacrobenthosintheXiaoqingRiverEstuaryrevealedasignificantpollutionstatusinthisregion.

简介：基于中国908工程的最近的海底的地形学数据(中国近海海洋的环境全面调查和评价)，我们分析了一般中国近海影响它的发展的海底的地形学的特征和因素。离开中国的海岸的海底的地形学跟随陆地地形学的NW-SE趋势。海底的地形学的坡度与大约0.8%的一个平均坡度从0.2%～1.6%。深度轮廓与海岸变主要平行，并且在河口区域伸出到海。海底的地形学被地质的结构统治，它证明二的典型特征高举并且从北方的二个沉淀事件到向南。与不同沉积环境和复杂水动力学条件相结合的地质的结构生产了能被三种类型描绘的地形学：沉积的盆，压缩高举，和转变形式。在沉积的盆和压缩高举区域，地形学的波动是小的，沉积是有细密纹理的，并且水流流动在一个单个方向，导致有沉积平原的海湾并且在水下累积倾斜，它具有一样的构造起源。转变类型地形学被强壮的波动和混合尺寸沉积描绘粒子，平台和沿海的陡坡和架平原和侵蚀免职地形近海。这是不完全的差错块开发的结果并且重复违反。在免职改革区域(转变形式类型)，地形学有强壮的波动，沉积是粗糙的，潮汐的沙山脉在源自陆地供应的河口和集中地区是开发得好的，并且Holocene沉积是厚的，由潮，河流量，和水流转变了。

简介：Separationtechnologyofrareearthelements(REEs),asthecriticalstepintheseparationprocess,hadlongbeenfraughtwithtechnicaldifficulty.AresearchprojectconductedbyBaotouShiboRareEarthExtraction&EquipmentCo.Ltd.,BaotouREEResearchInstitute,andBaotouSteel&REEGroupHi-TechCo.Ltd(InnerMongolia),hassuccessfullysolvedtheproblemusingacentrifugalextractorandadvancedtechniquestoachieveakeybreakthrough.ThekeydeviceofthewholeproductionlinecontainsCTL-500FBcentrifugalextractorsanddigitalflowsystemequipment.Employmentofanautomaticcontrollingsystemanditsfullyfunctionaloperationsystem,alongwithvarioussupportivefacilities,fulfilstheseparationprocessesforvariousrareearthmaterials.Comparedwithconventionalbox-typeseparationtechnology,thisnewapproachsignificantlyimprovesthestirringintensity,thusimprovingproduction

简介：ThisworkinvestigatesthedistributionofhighwindsaboveBeaufortscale6intheoffshorezonesofChinausinghigh-resolutionsatellitemeasurements.AnumericalexperimentiscarriedoutinordertofindouttheeffectsofTaiwanIslandontheformationofstrongwinds.Theanalysisindicatesthatthedistributionofhighwindoccurrenceissimilartothatoftheaveragewindvelocityinwinter.Highwindstendtobeanchoredinspecialtopographicalregions,suchastheTaiwanStrait,theBashiChannelandthesoutheastcoastofVietnam.HighwindsoccurmuchmorefrequentlyoverthewarmerthanthecolderflankofKuroshiofrontasitmeandersfromTaiwantoJapan.Thefrequencyofhighwindsdecreasesdrasticallyinspring.TheTaiwanStraitmaintainsthelargesthighwindoccurrence.Besides,highwindsremainfrequentintheBashiChannel,thesoutheasttipofTaiwanIslandandthewarmerflankofKuroshiofront.Insummer,highwindsgenerallyoccurinfrequentlyexceptoverabroadregionoffthesoutheastcoastofVietnamnear10°Nandthefrequencytheredecreasesfromsouthwesttonortheast.HighwindsaroundTaiwanIslandpresentnearaxisymmetricdistributionwithlargerfrequencyalongsoutheast-northwestdirectionandsmallerfrequencyalongsouthwest-northeastdirection.Thedominantdirectionofhighwindsexhibitsacounterclockwisecirculationsurroundingtheisland.Thefrequencyofhighwindsincreasesrapidlyinautumnandalmostrepeatsthedistributionthatappearsinwinter.ThesimulationresultssuggestthattheeffectsofTaiwanIslandtopographyonhighwindsvarywithseasons.Inwinter,topographyisthemajorcauseofhighwindsinthesurroundingoceaniczones.HighwindsinbothTaiwanStraitandthesoutheastcorneroftheislanddisappearandthefrequencydecreasesgraduallyfromsouthtonorthwhentheterrainisremoved.However,insummer,highwindfrequencyderivedfromtwosimulationswithandwithoutterrainisalmostidentical.Weattributethisphenomenontothefactorswhicharerespon

简介：AquantitativediagnosisiscarriedoutfortheupwardbranchofalocalmeridionalcirculationoversouthernChina(SC)duringtheabnormalsnowstormswithseverefreezingrainfrom10Januaryto3February2008.Thediagnosticstudyshowsthattheupwardbranchismainlyassociatedwiththezonaladvectionofwesterlymomentumandmeridionaltemperatureadvectioninsteadofthelatentheating(whichiscommonlythedominantfactorinmanyotherstormcases).Thecorrespondingweatheranalysesindicatethat(1)thezonaladvectionofwesterlymomentumrepresentstheeffectoftheupper-leveldivergenceontheanticyclone-shearsideintheentranceofa200hPawesterlyjetwithawestwarddeviationfromitsclimatologicallocationoversouthwesternJapan;(2)themeridionaltemperatureadvectionrepresentstheinteractionbetweenthemid-lowerlayer(850to400hPa)warmadvectionoverSC(aheadoftemperatureandpressuretroughswiththelattertroughdeeperthantheformerintheBayofBengal)andcoldadvectionovernorthChina(steeredbyanunderlyingflowat500hPa);(3)therelativelyweakvaportransport(comparedtothatofspring,summerandautumn)fromtheBayofBengalandtheSouthChinaSeatoSCandtheexistenceofatemperatureinversionlayerinthelowertroposphereoverSCdiminishtheeffectoflatentheating.Withthesignificantincreaseofvaportransportafter24January,theroleoflatentheatingisupgradedtobecomethethirdpositivecontributortotheupwardbranchoverSC.

简介：Aregionalclimatemodelisemployedtosimulatetheaerosols(dust,sulfate,blackcarbon,andorganiccarbon)andtheirdirecteffectontheclimateoverChina.Theemphasisisonthedirectradiativeforcingduetothechangeinmixingstateofaerosols.Theresultsshowthatdirectradiativeforcingissignificantlydifferentbetweenexternallyandinternallymixedaerosols.Atthetopoftheatmosphere(TOA),theradiativeforcingofexternallymixedaerosolsislargerthanthatofinternallymixedones,especiallyintheTarimdesertregionwherethedifferenceisabout0.7Wm2.Atthesurface,however,thesituationbecomesopposite,especiallyintheSichuanbasinwherethedifferenceisabout-1.4Wm2.Nonetheless,eitherexternallyorinternallymixedaerosolsinChinacanresultinasignificantcoolingeffect,exceptforthewarminginSouthChinainwinterandtheslightwarminginNorthChinainFebruary.Thecoolingeffectinducedbyexternallymixedaerosolsisweakerthanthatinducedbyinternallymixedaerosols,andthisismoreobviousinspringandwinterthaninsummerandautumn.Inspringandsummer,theinhibitingeffectofexternallymixedaerosolsonprecipitationislessthanthatofinternallymixedaerosols,whereasinautumnandwinterthedifferenceisnotobvious.

简介：OnApril14,2010at07:49(Beijingtime),acatastrophicearthquakewithMS7.1occurredatthecentralQinghai-TibetanPlateau.TheepicenterwaslocatedatYushucounty,QinghaiProvince,China.Atotalof2036landslidesweredeterminedfromvisualinterpretationofaerialphotographsandhighresolutionremotesensingimages,andverifiedbyselectedfieldinvestigations.Theselandslidescoveredatotalareaofabout1.194km2.Characteristicsandfailuremechanismsoftheselandslidesarelistedinthispaper,includingthefactthatthespatialdistributionoftheselandslidesiscontrolledbyco-seismicmainsurfacefaultruptures.Mostofthelandslidesweresmallscale,causingratherlesshazards,andoftenoccurringclosetoeachother.Thelandslideswereofvarioustypes,includingmainlydisruptedlandslidesandrockfallsinshallowsandalsodeep-seatedlandslides,liquefactioninducedlandslides,andcompoundlandslides.Inadditiontostronggroundshaking,whichisthedirectlandslidetriggeringfactor,geological,topographical,andhumanactivityalsohaveimpactontheoccurrenceofearthquaketriggeredlandslides.Inthispaper,fivetypesoffailuremechanismsrelatedtothelandslidesarepresented,namely,theexcavatedtoesofslopesaccompaniedbystronggroundshaking;surfacewaterinfiltrationaccompaniedbystronggroundshaking;co-seismicfaultslippingaccompaniedbystronggroundshaking;onlystronggroundshaking;anddelayedoccurrenceoflandslidesduetosnowmeltorrainfallinfiltrationatsiteswhereslopeswereweakenedbyco-seismicgroundshaking.Besidesthemainco-seismicsurfaceruptures,slopefissureswerealsodelineatedfromvisualinterpretationofaerialphotographsinhighresolution.Atotalof4814slopefissures,withatotallengthupto77.1km,werefinallymapped.Theseslopefissuresaremainlydistributedontheslopeslocatedatthesoutheasternendofthemainco-seismicsurfacerupturezone,anareasubjecttostrongcompressionduringtheeart

简介：Shallowfreshwaterbodiesinpeatareascouldbeanimportantcontributortogreenhousegasesintheatmosphere.Inthisstudy,thepartialpressureofCO2inthesurfacewateroftheDianshanLakewasinvestigatedinsituinAugust2011.TheaveragepCO2inthestudyareawas2300μatmandfluctuatedwithintherangeof989–5000μatm.pCO2showedareversetrendtothevariationsofpHandDOinthesurfacewateroftheDianshanLake.ThewatertoairdiffusionfluxofCO2oftheupstream,middlelakeanddownstreamwererespectively63,33and14mmol/m2/d.Onaverage,thediffusionfluxofCO2ofthewholelakewas31mmol/m2/d.Consequently,ourresultsshowthatduringthesamplingseason,theDianshanLakeappearstobeagreatsourceofCO2.ItisalsodemonstratedthatrespirationcouldbethedominantbiochemicalreactionintheDianshanLakeinsummer.