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1、JOURNALOFGEOPHYSICALRESEARCH,VOL.109,D02307,doi:10.1029/2003JD003950,2004AnalysesoffirngassamplesfromDronningMaudLand,Antarctica:Studyofnonmethanehydrocarbonsandmethylchloride111,21K.A.Kaspers,R.S.W.vandeWal,J.A.deGouw,C.M.Hofstede,1133M.R.vandenBroeke,C.vander
2、Veen,R.E.M.Neubert,H.A.J.Meijer,455C.A.M.Brenninkmeijer,L.Karlo¨f,andJ.-G.WintherReceived4July2003;revised10September2003;accepted7October2003;published27January2004.[1]FirnairwassampledontheAntarcticplateauinDronningMaudLand(DML),duringtheNorwegianAntarcticRes
3、earchExpedition(NARE)2000/2001.Inthispaper,wedescribetheanalysesformethylchlorideandnonmethanehydrocarbons(NMHCs)inthesefirnairsamples.Forthefirsttime,theNMHCsethane,propane,andacetylenehavebeenmeasuredinAntarcticfirnair,andconcentrationprofilesforthesegaseshav
4、ebeenderived.Aone-dimensionalnumericalfirnairdiffusionmodelwasusedtointerpretthemeasuredprofilesandtoderiveatmosphericconcentrationsasafunctionoftime.TheatmospherictrendswederivedfortheNMHCandmethylchlorideatDMLcovertheperiodfrom1975to2000.Methylchlorideshowsad
5、ecreasingtrendof1.2±0.6pptperyear(annualmeanconcentration548±32ppt).Forethanewefoundanincreasingtrendof1.6±0.6pptperyear(annualmeanconcentration241±12ppt).Theconcentrationsofpropaneandacetyleneappeartobeconstantovertheperiod1975–2000,withannualmeanconcentration
6、sof30±4pptforpropaneand24±2pptforacetylene.INDEXTERMS:0365AtmosphericCompositionandStructure:Troposphere—compositionandchemistry;0368AtmosphericCompositionandStructure:Troposphere—constituenttransportandchemistry;KEYWORDS:firnair,NMHandmethylchloride,atmospheri
7、ctrendsCitation:Kaspers,K.A.,etal.(2004),AnalysesoffirngassamplesfromDronningMaudLand,Antarctica:Studyofnonmethanehydrocarbonsandmethylchloride,J.Geophys.Res.,109,D02307,doi:10.1029/2003JD003950.1.Introductionstratosphere[KhalilandRasmussen,1999].Thisgas,whichi
8、semittedbybiomassburningandnaturalsources,[2]Chemicalanalysesofairtrappedinfirnallowthecontributedapproximately15%ofthetotalstratosphericreconstructionoftheconcentrationsofa
