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GWAS Data Status: ATTREX 2013

This document details the GWAS sample collection and analytical challenges faced during the ATTREX 2013 mission, undertaken to gather atmospheric data. It highlights the performance of various flight tests, including RF01's sample loss due to pump failure and RF02's electrical shutdown. A total of 388 samples were collected, capturing 32 gases. The analysis discusses artifacts found in ethyne and moisture-related issues during sample injection, emphasizing the need for normalization using long-lived tracers like CFC114. The document concludes with a call for data archiving after the analysis is complete.

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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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