TY  - GEN
Y1  - 2006///
ID  - heidok6696
KW  - Satellitenvalidierung 
KW  -  Stickstoffpartitionierung 
KW  -  Chlorpartitionierung 
KW  -  IodbudgetSatellite validation 
KW  -  Nitrogen partitioning 
KW  -  Chlorine partitioning 
KW  -  Iodine budget
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/6696/
AV  - public
A1  - Butz, André
TI  - Case Studies of Stratospheric Nitrogen, Chlorine and Iodine Photochemistry Based on Balloon Borne UV/visible and IR Absorption Spectroscopy
N2  - Nitrogen and halogen bearing compounds play an important role in catalytic loss of stratospheric ozone. Balloon borne spectroscopic measurements of the vertical distribution of the most important nitrogen, chlorine and iodine containing species are used to estimate the quality of state-of-the-art instruments and retrieval algorithms and to gain new insights into stratospheric photochemistry. A comparison study between observations of O3 and NO2 in the UV/visible and infrared spectral ranges involving the DOAS and LPMA balloon borne instruments and the satellite borne SCIAMACHY instrument yields reasonable agreement. The variety of trace gases measured by the LPMA/DOAS balloon payload allows for investigation of the budget and partitioning of stratospheric nitrogen and chlorine under several geophysical conditions. Comparison of the observations with the 3-D chemical transport model (CTM) SLIMCAT indicates that the ratio between short- and long-lived nitrogen containing species is overestimated by the model. For a high-latitude winter scenario the 1-D stratospheric chemistry model LABMOS is constrained by the observations in order to test recently published updates of the reaction kinetics of the ClO-ClO and ClO-BrO catalytic cycles with respect to model-measurement agreement and ozone loss rates. The latter are enhanced by 20% to 25% when using the kinetic updates. The determination of upper limits for IO and OIO corroborate earlier findings of the budget of stratospheric iodine in high- and mid-latitudes and extend the data base to tropical latitudes. Given the measured IO and OIO upper limits, model calculations show that total gaseous iodine in the lower tropical stratosphere is less abundant than (0.32 ± 0.11) ppt or (0.38 ± 0.10) ppt depending on whether OIO photolysis occurs or does not.
ER  -