Atmospheric trace gas measurements using chemical ionisation time-of-flight mass spectrometry / Yun Li. Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag, [2020] ; copyright 2020
Content
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
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