Project Details
Projekt
Using tracer observation with GhOST-MS during TACTS, SALSA, POLSTRACC and WISE to derive age spectra and the halogen budget of the UTLS during different seasons
Applicant
Professor Dr. Andreas Engel
Subject Area
Atmospheric Science
Term
from 2016 to 2020
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 316588118
We propose to deploy our gaschromatographic system GhOST-MS (Gas chromatograph for the Observation of tracers - coupled with a mass spectrometer) on HALO during the WISE mission. GhOST-MS will measure tracers with different lifetimes (ranging from near infinite like SF6 to a few weeks (CHBr3)) in the lower and lowermost stratosphere. These measurements will be combined with observations from the TACTS, SALSA and POLSTRACC campaigns. We will focus on two scientific topics: the derivation of transit time distributions (age-spectra) and the derivation of a halogen budget of the lower and lowermost stratosphere. A focus of the halogen budget will be on bromine. The evaluation be performed for different seasons and for different meteorological situations. A new method will be developed to derive bimodal age spectra, which will lead to a better description of the transit time distributions relevant to the lower and lowermost stratosphere. A close collaboration with Forschungszentrum Jülich and the CLaMS modelling work performed there is planned. The method developed by Ehhalt et al. (2007) will be used as a basis for our new approach. With respect to the halogen budget we propose to use our measurements to derive the amount of inorganic bromine and chlorine from short-lived source gases in the lower and lowermost stratosphere, where it can react with ozone. These data will be combined with quasi-simultaneous measurements of inorganic halogen species by the University of Heidelberg, in order to derive a complete halogen, especially bromine budget.
DFG Programme
Infrastructure Priority Programmes
