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ID:33737308
大小:2.88 MB
页数:74页
时间:2019-02-28
《利用激光雷达观测资料分析沙尘气溶胶与其影响》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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