Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Atmosphäre

UP 2.8: Vortrag

Mittwoch, 25. März 2015, 11:30–11:45, G/gHS

Bromine Chemistry in the Tropical UTLS during the NASA ATTREX Experiments — •Bodo Werner et al. — Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany

Bromine plays an important role for the chemistry of ozone in the stratosphere and upper troposphere. An accurate quantitative understanding of the sources, sinks, and chemical transformation of bromine species is thus important to understand the bromine budget in the upper troposphere and lower stratosphere (UTLS), which also serves as a gate to the stratosphere. Vertical transport of very short-lived organic bromine precursors and inorganic product gases has been identified as the main source of bromine in the UTLS. However, the contribution of inorganic vs. organic compounds is not well quantified, particularly in the tropical UTLS.

A limb scanning Differential Optical Absorption Spectroscopy instrument was deployed onboard NASA’s unmanned high-altitude Global Hawk aircraft during the NASA Airborne Tropical TRopopause EXperiment (ATTREX) during a series of flights into the eastern and western Pacific tropopause layer up to 18 km. Observations of BrO, NO₂ and O₃ and of other trace species, in particular of brominated hydrocarbons, are compared with simulations of the SLIMCAT chemical transport model and interpreted with respect to photochemistry and the budget of bromine within the tropical tropopause layer (TTL).