利用激光雷达观测资料分析沙尘气溶胶与其影响

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1、南京信息工程大学硕士学位论文Abs仃actDuststormsISadisasterweatherphenomenonbecauseofthewindonthegroundblowingthedustandsandintotheairandcausingtheairofakindofcloudyfinally．Theoccurrencefrequencyandintensityofduststormsalerelatedtohighwindspeed,drought,andotherclimatebackgro

2、undandabnormalatmosphericcirculationete．Atthesametime，theyarealsorelatedtothehumanactivities．ThecharacteristicsofduststormsinChinaarcstudiedbyusingtheobservationaldatafrom1954to2009．InnorthwestofChina,aridandsemi—aridregionispronetodustweather,especiallyinth

3、eedgeoftheTaklimakanDesertofTarimBasininXinjiang，westofInnerMongolia，northoftheQilianMountainsinGansuProvinceandcentralofInnerMongolia．DuststormsinChinacanbedividedintothetransmissionpathsofnorth,westandnorthwest．Thereisahigherfrequencyofduststormsfromthenor

4、thwestpathandthewestpath．DuststormsoriginatedfromnorthwestofChinaaffectvastareasofChinaandsurroundingcountries．Theobservationalrecordsbeginrangfrom1954showthat,exceptforafewsites，duststormsfrequencyinthecountrywitnessadecreasingtrendwithobviousinter-annualva

5、riabilityandrelativelyactiveandcalmperiods．ThemainweathersystemforformingduststormsinChinaisMongolianCyclonesandtheaccompanyingcoldfronts．Abnormalrainfall，temperature，windandotherclimaticfactorsarecloselyrelatedtotheformationanddevelopmentofduststorms．Themob

6、ileDifferentialAbsorptionLidar①L让)systemforamaospheficpollutionmeasurementsdevelopedbytheChineseAcademyofSciences’InstituteofOpticsandFineMechanicsinAnhuiwasusedtomeasurethedustaerosolsopticalpropertiesduringduststormsandfoghazeweathers．UsingFernaldaerosolso

7、pticalpropertiesinversionalgorithmandthemeasureddata,thedustaerosolsopticalpropertiesinHefeiCityduringduststorms，mainlyincludingtheaerosolextinctioncoefficientprofileandAOD，werecalculatedandanalyzed．Theresultshowsthatthereisallobviousdifferenceintheprofilest

8、heduststormsmovethroughthesite．Theduststormsstrengthandtheweatherandcirculationbackgroundwillaffecttheprofiles．Therewillgenerallyappearalayerofhi曲concentrationofdustaerosol摘要from3to6kminHereiwhe