SurfaceO3concentrationanditsprecursorshavebeenobservedatLongfengshanstation,HeilongjiangProvinceforaperiodofoneyearfromAugust13,1994toJuly30,1995.RelationshipbetweensurfaceO3andthemeteorologicalconditionsduringthisperiodisanalyzedinthisstudy.ObservationresultsshowthatdiurnalvariationofsurfaceO3followsapatternofdouble-peakswithamplitudeof27—28ppbunderfinedaysinsummerandautumn.Althoughthediurnalvariationissmall（14ppb）,itisstilldetectablewhenitisovercast.DiurnalvariationofO3isirregularunderrainydays.SurfaceO3concentrationriseswhenwindspeedstartstoincreaseat0800BT（BeijingTime）from0to6ms-1inautumn,winterandsummer.RelativehighsurfaceO3concentrationisnoticedfrequentlywhenS,SSW,SWandWSWwindareencounteredatthestationduringallseasons.At0800BTand1400BTthesurfaceO3concentrationincreaseswiththeincreaseofglobalradiationaccordinglyduringfinedaysinwinter,springandautumn.DuringfinedaysaveragepeakofO3concentrationinsummeris20ppbhigherthanthatinwinterwhiletheaveragepeakofglobalradiationinsummerisalmosttwiceashighasthatinwinter.TheaveragesurfaceO3concentrationunderfinedaysinautumnatLongfengshanstationis14ppblowerincomparisontotheobservationresultsfromLin’anstationwhereLin’anisataboutthesamelongitudeandlowerlatitude,withsameenvironment,whichismainlycausedbythedifferenceofglobalradiationduetodifferentlatitudesinthesetwoareas(differenceofaveragepeakglobalradiationabout100Wm-2).
