简介：Objective:Toestimatethecancerincidenceandmortalityin2012inGuangdongprovincebyanalyzingthecancerdataofselectedpopulation-basedcancerregistriesinGuangdongprovincein2012.Methods:Eightofninepopulation-basedcancerregistriessubmittedcancerdatatotheGuangdongProvincialCentreforDiseaseControlandPrevention(GuangdongCDC),whosedatametthedataqualitycriteriawereincludedforanalysis.Thestatisticsofselectedregistries,stratifiedbyareas,gender,ageandcancertypes,wereusedtoestimatethecancerincidenceandmortalityin2012inGuangdongprovinceaccordingtothepopulationdatainGuangdongprovince.Segi'spopulationandthenationalcensuspopulationin2000wereusedforcalculatingtheage-standardizedrates(ASR).Results:Atotalof15,084,942people,accountedfor17.47%ofallpopulationinGuangdongprovince,werecoveredin8selectedpopulation-basedcancerregistriesin2012.Thepercentageofcasesmorphologicallyverified(MV%)andthepercentageofdeathcertificate-onlycases(DCO%)were72.84%and0.87%,respectively,andthemortality/incidence(M/I)ratiowas0.56.Itwasestimatedthattherewere211,300newcancercasesand117,300cancerdeaths.Theincidencecruderate(CR),theASRbyChinesestandardpopulation(ASRC)andbyworldstandardpopulation(ASRW),andtheaccumulatedrate(AR)(0-74years)were250.20/100,000(265.39/100,000inmales,234.29/100,000infemales),207.04/100,000,201.34/100,000and22.91%,respectively,inGuangdongprovincein2012.TheincidenceCRandASRCwere267.25/100,000and221.43/100,000inurbanareas,and215.51/100,000and178.77/100,000inruralareas,respectively.ThedeathCR,ASRC,ASRWandAR(0-74years)were148.44/100,000(190.95/100,000inmales,105.06/100,000infemales),103.73/100,000,102.44/100,000and11.68%,respectively,inGuangdongprovincein2012.ThedeathCRandASRCwere164.57/100,000and105.46/100,000inurbanareas,and124.63/100,000and99.97/100,000inruralareas,respectivel

简介：Thestructureofatmosphericboundarylayerdeterminestheabilityofatmosphericdispersionandhasanessentialimpactonairborneaerosols.Inthispaper,thedataofaradiosoundingexperimentheldinDongguanNationalMeteorologicalObservationStation,whichisinacoastalcityinPearlRiverDelta,aswellasthedataofatmosphericaerosols,wereutilizedinordertoanalyzethecharacteristicsofatmosphericboundarylayeranditseffectsonsurfaceaerosolconcentrations.Theresultsareshowedatfollows:thelocalcirculations,associatedwithdominantwinds,madecomplexstructuresofatmosphericlayers,asthecoldairandsystematicwindsweakenedintheendofacoldairevent.Weakenedwindshearsandinversionlayers,especiallyastrongnear-surfaceinversionlayer,remarkablydiminishedtheatmosphericdiffusionabilitiesandfacilitatedanespeciallyhighconcentrationofsurfaceaerosols.Theconvergencelineorweakshearlineofseabreezeinthegroundlevelhelpsweakentheatmosphericdiffusionabilitiesandresultsinatmosphericaerosolsaccumulation.

简介：Therelationshipbetweenthefactoroftemperaturedifferenceofthenear-surfacelayer(T1000hPa-T2m)andseafogisanalyzedusingtheNCEPreanalysiswithahorizontalresolutionofl°xl°（2000to2011）andthestationobservations（2010to2011）.TheelementistreatedasthepredictionvariablefactorintheGRAPESmodelandusedtoimprovetheregionalpredictionofseafogonGuangdongcoastland.（1）Therelationshipbetweenthisfactorandtheoccurrenceofseafogisexplicit:Whentheseafoghappens,thevalueofthisfactorisalwayslargeinsomespecificperiods,andthenegativevalueofthisfactordecreasessignificantlyorturnspositive,suggestingtheenhancementofwarmandmoistadvectionofairflownearthesurface,whichfavorsthedevelopmentofseafog.（2）ThetransportationofwarmandmoistadvectionoverGuangdongcoastlandisfeaturedbysomestagesandthejumpingamongthesestates.Italsogetsstrongerovertime.Meanwhile,thenorthwardpropagationofwarmandmoistadvectionisquiteconsistentwiththenorthwardadvancingofseafogfromsouthtonorthalongthecoastlandofChina.（3）TheGRAPESmodelcanwellsimulateandrealizethefactorofnear-surfacetemperaturedifference.Besides,theaccuracyofregionalpredictionofmarinefog,therelevantthreatscoreandHeidkeskillscoreareallimprovedwhenthefactorisinvolved.