GWAS Data Status: ATTREX 2013

GWAS Data Status: ATTREX 2013E. Atlas, M. Navarro, X. Zhu, L. Pope, R. LuebSample CollectionGWAS capacity 90 samples / flightRF01 Pump Failure about 1/3 into flightRF02 Electrical failure shutdown system (no samples)RF03 RF06: Success (88 - 90)Total samples: 388 Field Analytical System

CCl3F_CFC_11OCS_Carbonyl_sulfideCCl2F2_CFC_12C2Cl3F3_CFC_113CBrClF2_Halon_1211C2Br2F4_Halon_2402CH3CCl3_Methyl_chloroformCCl4_Carbon_tetrachlorideCH3Cl_Methyl_chlorideCH3Br_Methyl_bromideCHClF2_HCFC_22CH3I_Methyl_iodideCH3CClF2_HCFC_142bCH3CCl2F_HCFC_141bC2H6_EthaneC2H2_EthyneCH2Cl2_Methylene_chlorideC3H8_PropaneCHCl3_ChloroformC6H6_BenzeneC2H4Cl2_1_2_DichloroethaneC2Cl4_TetrachloroethyleneCH2BrCl_BromochloromethaneC2HCl3_TrichloroethyleneCH2Br2_Methylene_bromideC6H5Cl_ChlorobenzeneCHBrCl2_BromodichloromethaneCHBr2Cl_DibromochloromethaneCH3ONO2_Methyl_nitrateCHBr3_BromoformC2H5ONO2_Ethyl_nitrateC3H7NO3_Isopropyl nitrate32 gases to be reported to archiveAnalytical IssuesArtifact in ethyne: coelution of unidentified CFC/HCFCCurrent version subtracts constant amount (22 pptv)

ATTREX (2013)+ ATTREX (2011)Analytical Issues (2)Moisture related artifact during sample injectionSample response different from standard responseUse long-lived tracer to normalize responsesCFC114 (lifetime ~ 189 yr)Expected variation ~1%/100 150 ppb O3Results in some loss of samples when CFC114 analytical problem (H2O)Effect depends on volatility (GC retention)less effect for more volatile than 114 CFC12, CH3Cl, HFC134aIntroduces extra imprecision into long-lived tracers; less of an impact for short-lived substances

Example (RF05) : Methyl nitrate

Example (RF05) : Methyl nitrate

Analytical Issues (3)Original working standard vented during shipment.Last minute replacement needed calibrationStill some standard checks required with primary standards when SEAC4RS analysis complete.Data to archive after meeting