Reactive organic species on natural dust [Elektronische Ressource] / vorgelegt von Ariunaa Batsaikhan

Reactive organic species on natural dust Ariunaa Batsaikhan Dissertation Universität Heidelberg 2007 Inaugural – Dissertation zur Erlangung der Doktorwürde der Naturwissenschaftlich – Mathematischen Gesamtfakultät der Ruprecht – Karls – Universität Heidelberg vorgelegt von Ariunaa Batsaikhan aus Sukhbaatar/Selenge, Mongolei Master of Science in Chemistry 2007 Thema Reactive organic species on natural dust Gutachter: Prof. Dr. Heinz Friedrich Schöler Prof. Dr. Dr. h.c. mult. German Müller Promotionsdatum: 26.07.2007 Abstract Annually 1000-3000 Tg mineral dust aerosol are emitted into the atmosphere, and transported over the oceans from one continent to the other. During the transport dust particles interact with components in the marine atmosphere and also with seawater as they fall into the ocean. Increased methyl iodide concentrations were observed during a field campaign on the Atlantic Ocean when dust storms occurred. Volatile halogenated organic compounds (VHOC) are photolyzed to produce reactive halogen species which are responsible for ozone depletion. An abiotic production mechanism for VHOC, involving humic-like substance (HULIS), iron and halide, was supposed to produce methyl iodide through the interaction of dust particles with seawater as all necessary ingredients were present.