简介:新疆哈密东天山构造岩浆带位于尾亚-罗布庄磁力高带上的喀拉塔格磁场小区,该带发育幅值在200~300nT的正磁场区,封闭磁异常对应于石炭纪石英闪长岩或隐伏基性侵入岩体。钳子山C07-2磁异常为该区带高磁异常,最高幅值2340nT。经钻探验证,打出3层低品位含铜钛磁铁矿,总厚119m。据81个化学样分析,TFe约3.6%~28.80%,平均品位13.5%,TiO21.31%~2.33%。ZK0701-10/5层(111~113m)见有2m厚具工业品位的铜矿体和磁铁矿体,分析结果为Cu0.4%,TFe28.8%。该钻探成果为在哈密玉西地区寻找岩浆型钛磁铁矿提供了有力依据。
简介:Atwo-waycouplingsimulationfromtheNCAR’sregionalclimatemodelREGCM2(calledR-2hereafter)andtheSUCROSmodelforcropgrowthdevelopedbytheWageningenAgriculturalUniversity,theNetherlands(bothmodels,whenincombination,denotedasR/S)arecarriedoutontheinteractionsbetweencropsandatmosphereintheHuang-Huai-HaiPlaininEastChina.EvidencesuggeststhattheR/Ssimulationscandepictprettywellthedynamicbiology-basedinteractionsbetweenthefactors,revealingreasonablyboththeday-to-dayvariationsinleafareaindex(LAI)andlandsurfacephysicstherein,andparticularlytheimprovementofthesimulation,independentlybyuseoftheR-2,ofsummerprecipitationandsurfacetemperatureintheresearchregion.Asaresult,thepresentresearchisofsignificancetothefurtherunderstandingoftheinteractionbetweentheclimatesystemandtheterrestrialecologicalsystems.
简介:Inthispaper,wefirstanalyzedclouddriftwind(CDW)datadistributionintheverticaldirection,andthenreassignedtheheightofeveryCDWintheresearchdomainintermsofbackgroundinformation,andfinally,conductedcontrastnumericalexperimentsofassimilatingtheCDWdatabeforeandafterreassignmenttoexaminetheimpactsontheforecastofthetrackofTyphoonChanthu(1003)from00:00(CoordinatedUniversalTime)21Julyto00:00UTC23July,2010.TheanalysisresultsoftheCDWdataindicatethatthenumberofCDWsismainlydistributedinthemidandupper-troposphereabove500hPa,withthemaximumnumberatabout300hPa.Theheightreassigningmethodmentionedinthisworkmayupdatetheheighteffectively,andtheCDWdataaredistributedreasonablyandnoobviouscontradictionoccursinthehorizontaldirectionafterheightreassignment.Afterassimilatingtheheight-reassignedCDWdata,especiallythewatervaporCDWdata,theinitialwindfieldaroundTyphoonChanthu(1003)becamemorereasonable,andthenthesteeringcurrentleadingthetyphoontomovetothecorrectlocationbecamestronger.Asaresult,thenumericaltrackpredictionsareimproved.
简介:利用CMIP5耦合气候模式的模拟结果,分析了不同排放情景下1.5℃和2℃升温阈值出现的时间。多模式集合平均结果表明:RCP2.6、RCP4.5和RCP8.5排放情景下,全球地表温度将分别在2029年、2028年和2025年达到1.5℃升温阈值;RCP2.6情景下直至21世纪末期都未达到2℃升温阈值,RCP4.5和RCP8.5排放情景下达到2℃升温阈值的时间分别为2048年和2040年。伴随着排放情景的升高,完成从1.5℃升温阈值到2℃升温阈值所需要的时间缩短。区域尺度上,达到同一升温阈值的时间主要表现为陆地比海洋早,且陆地对排放情景差异的敏感性相对较差,而海洋达到升温阈值的时间则随着排放情景的升高而明显提前。中国达到相应升温阈值的时间要早于全球,且以东北和西北地区出现的时间最早。
简介:利用静态暗箱/气相色谱法,在毛苔草(Carexlasiocarp)4个生长期(开花期、果熟期、果后营养期和立枯期),对三江平原毛苔草沼泽CO2排放通量的日变化进行了观测实验。结果表明,在开花期和果熟期,沼泽CO2日平均排放通量较大,分别为1286.79mg/(m^2·h)和829.28mg/(m^2·h),在果后营养期和立枯期,沼泽CO2日平均排放通量较小,分别为472.54mg/(m^2·h)和237.27mg/(m^2·h);在开花期、果熟期和果后营养期,沼泽CO2排放通量的日变化与温度的相关性不明显,而在立枯期,沼泽CO2排放通量的日变化与气温和地表温度(水温)呈显著正相关(n=11,P〈0.05)。各生长期的沼泽CO2日平均排放通量之间具有显著差异(n=4,P〈0.01)。从整个生长季来看,CO2日排放通量与气温、地表温度(水温)、5cm地温和10cm地温呈显著正相关(n=40,P〈0.01),与15cm地温也呈显著正相关(n=40,P〈0.05)。
简介:ThedensitiesofCO_2inclusionsinmineralsarecommonlyusedtodeterminethecrystallizingconditionsofthehostminerals.However,conventionalmicrothermometryisdifficulttoapplyforinclusionsofsmallsize(<5-10μm)orlowdensity.RamananalysisisanalternativemethodfordeterminingCO_2density,providedthattheCO_2density-Ramanshiftrelationisknown.ThisstudyaimstoestablishthisCO_2density-RamanshiftrelationbyusingCO_2inclusionssynthesizedinfusedsilicacapillaries.Byusingthisnewly-developedsynthetictechnique,weformedpureCO_2inclusions,andtheirdensitiesweredeterminedbymicrothermometry.TheRamananalysisshowedthattherelationbetweenCO_2density(Ding/cm3)andtheseparations(△incm~(-1))betweenthetwomainbands(i.e.Fermidiadbands)inCO_2Ramanspectracanberepresentedbyacubicequation:D(g/cm~3)=0.74203(-0.019⊿~3+5.90332⊿~2-610.79472⊿+21050.30165)-3.54278(r~2=0.99920).OurcalculatedDvalueforagiven⊿isbetweenthoseobtainedfromtwopreviously-reportedequations,whichwerederivedfromdifferentexperimentalmethods.AnexamplewasgiveninthisstudytodemonstratethatthedensitiesofnaturalCO_2inclusionsthatcouldnotbederivedfrommicrothermometrycouldbedeterminedbyusingourmethod.
简介:Theatmosphericgeneralcirculationmodelcoupledtothemixedlayeroceanmodelhasbeenusedtosimulatethechangesoftheglobalsoilmoisture.Comparingthesimulatedresultswithobservations,itisshownthatthemodelisca-pableofdoingsensitiveexperimentsaboutthecarbondioxidechange.The2×CO2/1×CO2comparisonshowsthattherearetheobviouschangesofthesoilmoistureintheglobalforfourseasons.Therearethewetsoilmoistureinthelowerlatitudesofbothhemispheresanddrysoilmoistureinthemid-dlelatitudesofbothhemispheresforfourseasons.Thedrysoilmoistureinsummerandwetinotherseasonsarefoundinthenorthernhigherlatitudes.TheanalysesofthephysicalfeedbacksresponsiblefortheCO2-inducedchangesofsoilmoistureshowthatthebud-getsofthesurfacewaterandheataretheimportantfactors.