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Lagrangian simulation of stratospheric water vapour : impact of large-scale circulation and small-scale transport processes / Liubov Poshyvailo. Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag, [2020]
Content
Introduction and motivation
Scientific background
Structure of the atmosphere
Upper troposphere and stratosphere (UTLS)
UTLS processes
Transport in the tropical tropopause layer (TTL)
Brewer-Dobson circulation (BDC)
Stratospheric water vapour (H2O)
Sources of stratospheric H2O: transport and dehydration
Methane (CH4) oxidation as a source of stratospheric H2O
Observations and modelling of stratospheric H2O
Stratospheric H2O trends
Data and method
CLaMS model set-up
Trajectory module (TRAJ)
Mixing module (MIX)
Cirrus module (CIRRUS)
CLaMS remarks
Meteorological reanalysis data
Satellite observations
Sensitivities of modelled stratospheric H2O in the LS
Simulation set-up
Stratospheric entry H2O sensitivity
Reanalysis uncertainty
Horizontal transport
Mixing effects
Discussion
Comparison of CLaMS simulated and reanalysis H2O
Vertical diffusivity induced by small-scale mixing
Chapter conclusions
Estimating BDC trends from stratospheric H2O changes
Theory of the mean age of air (AoA)
Methodology of estimating AoA trends from stratospheric H2O changes
Drivers of H2O changes
Assessing AoA trends from H2O changes
Research strategy
Application of the approximation method to the CLaMS data
Impact of entry mixing ratio propagation
The propagation of entry mixing ratios
Application of propagation procedure to the conserved mean age tracer
Application of propagation procedure to total hydrogen
The effects of propagated stratospheric entry H2O and CH4 on the AoA trends
Impact of using a monthly AoA-FRF correlation
Discussion
Chapter conclusions
Summary and conclusions
Validation of the CLaMS simulations
Impact of the dehydration at the poles on simulated stratospheric H2O
AoA-FRF correlation
Symbols and abbreviations
List of Figures
List of Tables
Bibliography
Afterword
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