基于北京325米气象塔观测的正,负湍流热扩散系数（英文）-豆柴文库

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基于北京325米气象塔观测的正,负湍流热扩散系数（英文）
Title:PositiveandNegativeTurbulentHeatDiffusionCoefficientsObservedfromthe325-meterMeteorologicalTowerinBeijing
Abstract:
Turbulentheatdiffusionplaysasignificantroleinunderstandingandpredictingatmosphericprocesses.Thisstudyinvestigatesandanalyzesthepositiveandnegativeturbulentheatdiffusioncoefficientsobservedfromthe325-metermeteorologicaltowerinBeijing.Thetowerprovidesuniqueinsightsintotheverticalprofilesofatmosphericvariablesandtheirturbulentcharacteristics.Theresultsofthisstudycancontributetoabetterunderstandingoflocalclimaticconditionsandaidinthedevelopmentofaccurateatmosphericmodelsforimprovedforecasting.
Introduction:
TurbulentheatdiffusionisakeyfactorintheexchangeofheatandenergybetweentheEarth'ssurfaceandtheatmosphere.Understandingthecharacteristicsofturbulentheatdiffusioniscrucialforstudyingvariousatmosphericphenomenasuchasurbanheatislands,airpollutiondispersion,andweatherpatterns.The325-metermeteorologicaltowerinBeijingoffersanexcellentplatformforobservingandanalyzingtheturbulentcharacteristicsoftheatmosphere.
Methods:
Datausedinthisstudywerecollectedfromthe325-metermeteorologicaltowerlocatedinBeijing.Thetowerisequippedwithadvancedinstrumentscapableofmeasuringvariousatmosphericvariablesatdifferentverticallevels.Theobservationswereobtainedatregularintervalsoveraspecificperiod.ThepositiveandnegativeturbulentheatdiffusioncoefficientswerecalculatedusingtheMonin-Obukhovsimilaritytheory,whichrelatessurfacefluxestoatmosphericstability.
Results:
Theanalysisofthepositiveandnegativeturbulentheatdiffusioncoefficientsrevealedinterestingpatternsandvariationsthroughouttheverticalprofile.Positiveheatdiffusioncoefficientswereobservedduringdaytimewhenthesurfacewaswarmerthantheatmosphereabove.Thisindicatesthatheatfromthesurfacewasbeingmixedupwardsandcontributingtowarmingtheoverlyingatmosphere.Negativeheatdiffusioncoefficientswereobservedduringnighttimewhenthesurfacecoolingwasgreaterthanthatoftheatmosphere,leadingtothetransferofheatfromtheatmospher