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GWAS Data Status: ATTREX 2013

GWAS Data Status: ATTREX 2013. E. Atlas, M. Navarro, X. Zhu, L. Pope, R. Lueb. Sample Collection. GWAS capacity 90 samples / flight RF01 Pump Failure about 1/3 into flight RF02 Electrical failure shutdown system (no samples) RF03 – RF06: Success (88 - 90) Total samples: 388 .

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GWAS Data Status: ATTREX 2013

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  1. GWAS Data Status: ATTREX 2013 E. Atlas, M. Navarro, X. Zhu, L. Pope, R. Lueb

  2. Sample Collection • GWAS capacity 90 samples / flight • RF01 Pump Failure about 1/3 into flight • RF02 Electrical failure shutdown system (no samples) • RF03 – RF06: Success (88 - 90) • Total samples: 388

  3. Field Analytical System

  4. 32 gases to be reported to archive

  5. Analytical Issues • Artifact in ethyne: coelution of unidentified CFC/HCFC • Current version subtracts constant amount (22 pptv) + ATTREX (2011) ATTREX (2013)

  6. Analytical Issues (2) • Moisture related artifact during sample injection • Sample response different from standard response • Use long-lived tracer to normalize responses • CFC114 (lifetime ~ 189 yr) • Expected variation ~1%/100 – 150 ppb O3 • Results 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, HFC134a • Introduces extra imprecision into long-lived tracers; less of an impact for short-lived substances

  7. Example (RF05) : Methyl nitrate

  8. Example (RF05) : Methyl nitrate

  9. Analytical Issues (3) • Original working standard vented during shipment. • Last minute replacement needed calibration • Still some standard checks required with primary standards when SEAC4RS analysis complete.

  10. Data to archive after meeting

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