Atmospheric trace gas measurements using chemical ionisation time-of-flight mass spectrometry / Yun Li. Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag, [2020] ; copyright 2020
Inhalt
- Abstract
- Introduction
- The Asian Monsoon Anticyclone
- Measuring atmospheric trace gases with Chemical Ionization Mass Spectrometry
- Tropospheric chemistry background
- Scientific questions and thesis structure
- Fundamentals of the instrumentation
- Chemical Ionization Mass Spectrometry
- Chemical ionisation within FunMass
- DBD ion source, ion-molecule reaction and ion funnel
- Standard-DBD ion source
- Concentric-DBD ion source
- Ion transfer stages and the time-of-flight mass analyser
- Quantitative analysis
- In-situ measurements with FunMass in the UTLS
- The FunMass aircraft inlet system
- Flight planning
- In-situ data interpretation
- FunMass measurements vs. satellite observations
- Tracer-tracer correlations
- Conclusions
- Trajectory studies on convective influence and air mass origins
- Model descriptions
- Convective signatures along flights
- Air mass origins
- Enhanced HCN in the lower stratosphere
- Discussion and conclusions
- Measurements with FunMass in a chamber study
- NO3-initiated oxidation of isoprene
- The SAPHIR chamber and FunMass sampling system
- Course of the campaign
- HNO3 production in the gas phase
- Background HNO3 measurements in the chamber
- Test with a low amount of C5H8 in the chamber
- Tests with high amounts of NO2 and C5H8
- HNO3 production with seed aerosols in the chamber
- Indirect and direct HNO3 production from NO2-O3-H2O and N2O5
- Nighttime and daytime chemistry combined experiment
- Detection of organic nitrates
- Conclusion
- Conclusions and perspectives
- Bibliography
- Acknowledgements
- Additional table and figures
- Leere Seite