Development, calibration and deployment of an airborne chemical ionization mass spectrometer for trace gas measurements / Talat Khattatov. Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag, [2019] ; copyright 2019
Inhalt
- Acronyms
- Introduction
- Trace gases in the atmosphere
- Platforms for measurements in the UTLS region
- Chemical ionization time-of-flight mass spectrometry
- Structure of the thesis
- Fundamentals of CI TOF MS
- Overlapping peaks in a mass spectrum
- Theory
- Resolution
- Typical MS for chemical ionization with CO3- as a reagent ion.
- Isotopologues in a mass spectrum
- Calculations
- Results
- Chemical kinetics simulations
- Theory
- Reaction rates
- Rate law
- Change of concentration with time
- Algorithm for solving systems of ordinary differential equations
- Calculations
- Results
- FunMass development and deployment
- M-55 Geophysica
- Overview
- The inlet system
- The ion source
- The transfer stage
- CTOF
- Gasdeck
- Problems of high voltage devices in airborne instruments
- Test flights and climate chamber tests
- Test of components in the climate chamber
- Instrument certification tests
- Results of the test campaign in Kalamata, Greece
- Full-up climate chamber tests
- FunMass instrument performance during the campaign in Kathmandu
- Characterization and calibration of FunMass
- Signal processing
- Laboratory calibration
- Sensitivity
- Limit of detection
- Precision
- Accuracy
- In-flight calibration
- Discussion
- Data acquisition and software
- General requirements for software and language selection
- TofWerk software
- Data format
- FunMass program
- Multitasking in Python
- Flight program
- Data acquisition task
- System monitor task
- TOF high voltage task, IFS high voltage task and turbopump task
- Measurement task
- Independence of the tasks
- Event logger
- GUI application for FunMass
- Results
- FunMass results
- Measurements and meteorological considerations
- Data consistency and preliminary results
- HCN
- HNO3
- A first FunMass and AURA-MLS comparison
- HNO3 - O3 correlation
- Lightning induced features in the FunMass measurements in Flight 6
- Summary
- Conclusions and outlook
- Bibliography
- Flowcharts for the FunMass software
- Multithreading in Python
- Python listings