La lecture à portée de main
Découvre YouScribe en t'inscrivant gratuitement
Je m'inscrisDécouvre YouScribe en t'inscrivant gratuitement
Je m'inscrisDescription
Sujets
Informations
Publié par | universitat_bremen |
Publié le | 01 janvier 2009 |
Nombre de lectures | 51 |
Langue | Deutsch |
Poids de l'ouvrage | 29 Mo |
Extrait
ASDO
ASDO
measurementsofiodine
satellitefrom
monoxide
purengasesSdesMessungen
ausSatellitenvom
dmonoIoxid
VomFachbereichPhysikundElektrotechnik
BremenersitätUnivder
zurErlangungdesakademischenGrades
DoktorderNaturwissenschaften(Dr.rer.nat)
Dissertationgenehmigte
Dipl.Phvys.orgelegtAnjavSocnhönhardt
Bremen,03.September2009
Dissertation
gaT
1.
2.
heingereict
am:
quiums:olloPromotionskdes
er:thGutac
er:thGutac
Prof.
Prof.
Dr.
Dr.
John
Lars
.P
03.09.2009
09.10.2009
Burrows
hkKalesce
roFAnne
ymand
stparenRudolf
Abstract
Atmosphericcolumnsofthetracegasiodinemonoxide,IO,havebeeninvestigatedbymeansof
spectroscopicmeasurementsinthevisiblewavelengthrange.Forthispurpose,solarradiationscat-
teredandreflectedbytheEarth’satmosphereandsurfaceisrecordedbysatelliteinstrumentation
innadirviewinggeometry.ThesespectrahavebeenanalysedfortheabsorptionsignaloftheIO
vibronicabsorptionlines.EmployingtheSciamachysensormountedontheENVISATsatellite,
globalobservationsofIOfromspacebecomepossibleforthefirsttime.Theimportanceofiodine
intheatmosphereliesinitshighpotentialfordestroyingozoneaswellasintheformationofnew
particleswhichisinitiatedbycondensableiodineoxidesandmayimpactonEarth’sradiationbud-
getatleastlocally.
AmajorchallengeinthisworkisthesmallnessoftheobservedIOopticaldepthswithrespectto
theinstrument’sdetectionlimit.TheretrievedIOslantcolumnsarethereforeaveragedovercertain
timeperiodsoftypicallyseveralmonths.WidespreadenhancedIOcolumnshavebeendetected
overtheAntarcticregionwithadetailedspatialandtemporaldistribution.Furtherregionswith
positiveIOdetectionaretheEasternPacificupwellingregionandsomeNorthernHemisphericcoast
lines.AdditionaldatasuchastroposphericBrOdistributions,iceconcentrations,phytoplankton
amountsanddiatomabundanceshavebeenconsideredinspecificcasesforcomparisonanddiscus-
sionpurposes,addressingthequestionofsourcesofatmosphericiodine,whicharemostprobably
biogenic.Successfulcomparisonandvalidationstudiesprovideconfidenceinthenewlydevelopedsatellite
IOproduct,andmodelcalculationshavebeenconductedtoinvestigatetheamountsofprecursors
necessaryfortheexplanationofobservedIOabundances.Whileinsomeanalyses,thelimitations
ofthesatellitemeasurementshavebeenencountered,thepresentedinvestigationshaveadvanced
theprospectsofremotesensingfromspaceforthedetectionoftheminortracegasIO.
Listpublicationsof
1.Articlesinpeer-reviewedjournals
firstAsauthor:
•Schönhardt,A.,Richter,A.,Wittrock,F.,Kirk,H.,Oetjen,H.,Roscoe,H.K.,andBurrows,
J.P.:Observationsofiodinemonoxidecolumnsfromsatellite,Atmos.Chem.Phys.,8,
2008.637-653,
co-author:As
•dael,Brinksma,M.,FaE.yt,J.,C.,Pinardi,Hermans,G.,VC.,olten,H.,Dirksen,Braak,R.J.,R.,RichVlemmix,ter,A.,T.,ScBerkhout,hönhardt,A.A.,J.vanC.,RoSwozen-art,
D.M.,P.Curier,J.,R.Oetjen,L.,H.,Celarier,WittroE.ck,A.,F.,Cede,Wagner,A.,T.,Knap,WIbrahim,.H.,O.VW.,eefkind,deJ.LeeuP.,w,EskG.,es,H.MoJ.,erman,Al-
laart,M.,Rothe,R.,Piters,A.J.M.,andLevelt,P.F.:The2005and2006DANDELIONS
NO2andaerosolintercomparisoncampaigns,JournalofGeophysicalResearch,113,D16S46,
2008.doi:10.1029/2007JD008808,
•D.,Celarier,Goutail,E.A.,F.,PBrinksma,ommereau,E.J.,J.-P.,Gleason,Lambert,J.F.,J.-C.,Vvaeefkind,nRoJ.P.,ozendael,Cede,M.,A.,Pinardi,Herman,G.,J.R.,WittroIonockv,,
E.,F.,ScChen,hönhardt,C.M.,A.,PRicongetti,hter,T.A.,J.,Ibrahim,Sander,S.O.P.,W.,WBucsela,agner,E.T.,J.,BoWjkenig,ov,M.B.,O.,MounSwt,art,G.,D.PSpinei,.J.,
Volten,H.,Kroon,M.,andLevelt,P.F.:Validationofozonemonitoringinstrumentnitrogen
dioxidecolumns,JournalofGeophysicalResearch,113,D15S15,doi:10.1029/2007JD008908,
2008.
•Hains,J.,Boersma,F.,Kroon,M.,Dirksen,R.,Volten,H.,Swart,D.,Richter,A.,Wittrock,
F.,Schoenhardt,A.,Wagner,T.,Ibrahim,O.,vanRoozendael,M.,Pinardi,G.,Gleason,
J.,Veefkind,P.,andLevelt,P.:TestingandimprovingOMIDOMINOtroposphericNO2
usingobservationsfromtheDANDELIONSandINTEX-Bvalidationcampaigns,Journalof
GeophysicalResearch,accepted8October2009,doi:10.1029/2009JD012399,inpress.
2.Selectedoralandposterpresentations(onlyfirstautor)
Oralpresentationsatconferencesandworkshops:
•A.Schönhardt,A.Richter,F.Wittrock,andJ.P.Burrows:ObservationofIOfromSpaceus-
ingSCIAMACHY,SixthACCENT-TROPOSAT-2Workshopon”Observingtracesubstances
fromspaceandintegratingtheresultswithmodels”inBremen,June2007.
•A.Schönhardt,A.Richter,F.Wittrock,H.Kirk,H.Oetjen,andJ.P.Burrows:Seasonalvari-
ationsofIOaboveAntarcticaobservedinthreeyearsofsatellitedataDPGFrühjahrstagung,
2008.h,MarcDarmstadt,
seminars:externalattationsPresen
•A.Schönhardt,A.Richter,F.Wittrock,andJ.P.Burrows:IodinemonoxideaboveAntarctica
-4yearsofsatelliteobservations,Hamburg,invitedtalkintheZMAWSeminar,April2008.
tations:presenosterP
•A.Schönhardt,F.Wittrock,A.Richter,H.Oetjen,J.P.Burrows,M.VanRoozendael,G.
Pinardi,H.Bergwerff,S.Berkhout,R.vanderHoff,H.Volten,D.Swart,andE.Brinksma,
MAX-DOASmeasurementsoftroposphericNO2fromtheDANDELIONS-IIcampaign,DPG
Springmeeting,Regensburg,Germany,March2007.
•A.Schönhardt,A.Richter,F.Wittrock,J.P.Burrows,Firstobservationsofatmospheric
iodineoxidecolumnsfromsatellite,EGUGeneralAssembly2007,Vienna,Austria,April
2007.•A.Schönhardt,A.Richter,F.Wittrock,H.Kirk,H.Oetjen,andJ.P.Burrows:Satelliteobser-
vationsofiodinemonoxideanditsseasonalcycleaboveAntarctica,IGAC10thInternational
Conference2008,Annecy(France),September2008.
•A.Schönhardt,F.Wittrock,A.Richter,H.Kirk,H.Schultei.d.B,andJ.P.Burrows:The
influenceofscatteringandabsorptionprocessesinseawateronatmosphericradiation-results
fromship-borneDOASmeasurements,DPGSpringMeeting,Hamburg,März2009.
Contents
ContentsfiguresofListtablesofListMotivationandductionIntrobackgroundScientific11.1Therelevanceofiodineindifferentfields.........................
1.1.1Iodineanditsrelevanceforhumanandanimalhealth.............
1.1.2Radioactiveiodine.................................
1.1.3Therelevanceofiodineforthebiosphere.....................
1.1.4Therelevanceofiodineintheatmosphere....................
1.2IntroductiontoEarth’satmosphere............................
1.3Theimportanceofozone..................................
1.4Halogensintheatmosphere................................
1.4.1Halogensinthestratosphere............................
1.4.2Halogensinthetroposphere............................
1.5Currentstateofatmosphericiodineresearch.......................
1.5.1Sourcesofreactiveiodinecompoundsintheatmosphere............
1.5.2Troposphericiodinechemistryandozonedepletion...............
1.5.3Higheriodineoxidesandparticleformation...................
1.5.4Iodineinthestratosphere.............................
1.5.5Observationsoftroposphericiodineoxides....................
1.6Atmosphericeffectsonradiation.............................
................................absorptionMolecular1.6.1..................................scatteringElastic1.6.2..................................scatteringRaman1.6.31.7Radiativetransferintheatmosphere...........................
1.7.1Descriptionofradiativetransfer..........................
1.7.2TheSCIATRANradiativetransfercode.....................
1.8DifferentialOpticalAbsorptionSpectroscopy......................
1.8.1TheDOASequation................................
1.8.2TheRingeffectreferencespectrum........................
1.8.3TheAirMassFactor................................
1.8.4TheDOASfittingroutine.............................
1.9Descriptionofinstruments.................................
1.9.1ThesatelliteinstrumentSCIAMACHY......................
1.9.2Ground-basedMAX-DOASsystems.......................
1.9.3Additionalsatelliteinstruments..........................
ivivii155667770131415171819112223262721323434353637393043444548494
i
2Developingtheretrievalofiodinemonoxidefromsatellite
2.1Satellitedataconfigurationandselection.........................
2.2TheDOASretrievalofiodinemonoxide.........................
2.2.1ThedevelopedIOstandardfit...........................
2.2.2Fitqualityandconsistency............................
2.3AirmassfactorconsiderationsfortheIOretrieval....................
2.4DetectionlimitforIO...................................
2.5PrecisionandaccuracyoftheIOretrieval........................
2.6ExampleresultsofglobalIOcolumns...........................
.......................................screeningCloud2.72.7.1Cloudscreeningwithanintensitycriterion....................
2.7.2CloudscreeningusingthePMDbasedclassificationscheme..........
2.8Influencingeffectsontheretrieval.............................
2.8.1Investigatedretrievalsettings...........................
2.8.2Retrievalinthe418-438nmwindow.......................
2.9Thechoiceofthebackgroundspectrum.........................
3ObservationsofIOfromsatellite
.....................................ationsobservGlobal3.13.2ObservationsofIOinAntarctica.............................
3.2.1SeasonalvariationofIOinAntarctica......................
3.2.2IOtimeseriesatHalleyStation,Antarctica...................
3.2.3Detailedanalysisinhighertemporalresolution.................
3.3DiscussionofobservationsinAntarctica.........................
3.3.1BrOobservationsandiceconcentrationinAntarctica..............
3.3.2ComparisonofIOwithBrOandseaicemaps..................
3.3.3IOinseaicecoveredareas..........