摘要
Thepresentstudyinvestigatesthecharacteristicsofturbulenttransferandtheconditionsfordustemis-sionandtransportusingthedustconcentrationandmicrometeorologicaldataobtainedduringdusteventsoccurringinthespringof2004overtheHuushandakedesertarea.Theturbulentexchangecoefficientsandturbulentfluxesofmomentumandheatarecalculated.Therelationshipsbetweendustflux,frictionvelocity,andwindspeedarealsoexplored.Theresultsshowthatthermalturbulenceisdominantduringdaytimeofnon-dnstydays.Thedynamicturbulenceincreasesobviouslyandthesensibleheatfluxreducesbydifferentdegreesduringdustevents.Thereisanefficientdownwardtransferofmomentumbeforeduststormoccur-rence,andboththedynamicturbulenceandthethermalturbulenceareimportantinthesurfacelayer.Thedynamicturbulenceevenexceedsthethermalturbulenceduringseverednststormevents.Thevaluesofdustfluxvaryintherangeof-5-5,-30-30,and-200-300μgm~(-2)s~(-1)duringnon-dustydays,blowingdust,andduststormevents,respectively.Aslightupwardtransportofdustisobservedduringnon-dnstydays.Thedustfluxgraduallyvariesfrompositivetonegativeduringdnststormperiods,whichindicatesthetimeevolutionofdusteventsfromdustrisingtostablysuspendingandthendeposition.Thedustfluxisfoundtobeproportionaltou_*~3.Thethresholdvaluesofwindspeedandfrictionvelocityareabout6and0.4ms~(-1),respectively.
出版日期
2008年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
