Airborne in situ measurements of short-lived chlorocarbons and investigation of their pathways from northern hemispheric source regions into the lowermost [...] / von Valentin Michael Lauther. Wuppertal, 2020
Inhalt
- Abstract
- Introduction
- Transport into the lowermost stratosphere
- Tracer-tracer correlation
- Overview on CH2Cl2 and CHCl3
- Sources of CH2Cl2 and CHCl3
- Global source regions of CH2Cl2 and CHCl3
- Sinks and lifetime
- Impact on ozone
- Aircraft measurements of CH2Cl2 and CHCl3
- Outline of this thesis
- HAGAR-V hardware development and characterization
- The instrument and its measurement principle
- Preconcentration unit
- Preconcentration unit design
- Temperature measurement for the preconcentration trap
- Temperature characterization for the preconcentration trap
- Breakthrough volumes for different adsorbents
- Memory effects
- Fast gas chromatography
- Linearity of signal response
- First operation on the HALO research aircraft
- Analysis and processing of WISE MS data
- WISE (Wave-driven ISentropic Exchange)
- Peak fitting
- Calculation of HAGAR-V MS mixing ratios for WISE data
- Detrending
- Calibration methods
- Correction of jumps in the detector response
- Systematic bias of in-flight SPAN measurements
- System contamination during WISE
- Influence of inlet pumps
- Comparison with other instruments
- Investigation of transport of CH2Cl2 and CHCl3 into the UTLS
- Chemical Lagrangian Model of the Stratosphere
- The CH2Cl2-N2O correlation
- Correlation branch filter
- Background mixing ratios of CH2Cl2
- Impact of different source regions
- Seasonal dominance of regional sources
- Trajectory transport times and source regions
- Major updraft events
- Transport pathways
- The CHCl3-N2O correlation
- Background mixing ratios of CHCl3
- Impact of different source regions
- Comparison of CHCl3 and CH2Cl2
- Impact of hurricane Maria
- CH2Cl2 and CHCl3 measurements around major population centers in East Asia
- Summary
- Synopsis and outlook
- Detailed description of HAGAR-V
- HAG_01 - Power Distribution Box
- HAG_02 - Base module and HAG_07 - Display
- HAG_03 - Gas Supply
- HAG_04 - ECD
- HAG_05 - MS/Licor
- HAG_06 - Power / cRIO
- MS module characterizations
- Breakthrough volumes
- BTV of the preconcentration trap used during WISE
- BTV preconcentration trap with Graphsphere 2017
- BTV of a multi adsorbent preconcentration trap
- Memory effects
- Measurement setup of test for signal linearity
- Limit of detection (LOD)
- HAGAR-V during the aircraft campaign WISE
- Pre-flight preparations
- Issues during WISE
- Overheating
- Dehydrating of air samples
- Regulation of mass flow controller
- Very strong adsorbent
- Species that were not usable for scientific analysis
- MS module parameters during WISE
- MS module: data processing
- Approximation of the EMG fit
- Analysis of systematic bias of in-flight SPAN measurements
- Peak height vs peak area
- Analysis of system contamination during WISE
- Analysis of SPAN-to-pump measurements
- Detailed comparison with other instruments
- Calibrations and relative accuracy
- Calibration of primary working standard
- Calibration of in-flight calibration gases
- WISE MS relative accuracy estimates
- Supplemental information about the CH2Cl2-N2O correlation
- Supplemental information about measurement locations
- Supplemental graphs of emission tracers
- Supplemental statistics about the correlation branch filter
- Supplemental information about the CHCl3-N2O correlation
- The positions of measurement
- Supplemental information about emission tracers
- Seasonal dominance of source regions for CHCl3
- Supplemental information about measurements associated with hurricane Maria
- Supplemental information about backward trajectories
- Supplemental information about MIRAH and EMeRGE–Asia samples
- Nomenclature
- List of Figures
- List of Tables
- Bibliography
- Acknowledgments