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Subproject 1.5

Studies of marine reactive halogen release mechanisms in the Mauritanian and Peruvian upwelling regions and extrapolation in a global model

Reactive Halogen Species (RHS) such as chlorine monoxide, bromine monoxide and iodine monoxide have a significant impact tropospheric as well as stratospheric ozone chemistry and thus on the atmosphere's oxidation capacity.
RHS can be photolytically produced from precursor substances like halogenated hydrocarbons which are measured by project partners. But also inorganic emission processes e.g. via seasalt aerosol exist. The goal within SOPRAN is to measure RHS abundances in the atmosphere, understand the emission processes and obtain a global picture to improve the understanding of their role in tropospheric chemistry.
Measurements are performed using Diffential Optical Absorption Spectroscopy (DOAS), because due to their high reactivity the above mentioned species need to be measured in-situ or via remote-sensing-techniques. MAX-DOAS measurements can provide tropospheric concentration profiles during daylight, CE-DOAS continuous in-situ data.
Fig.1: CE-DOAS Setup for in-situ measurements of IO, NO2, water vapor and glyoxal.

PI: U. Platt
Contact: Johannes Lampel (