Biogenic emission of halocarbons [Elektronische Ressource] / vorgelegt von Sarah Gebhardt

Biogenic Emission of Halocarbons Dissertation zur Erlangung des Grades „Doktor der Naturwissenschaften“ im Promotionsfach Chemie am Fachbereich der Chemie, Pharmazie und Geowissenschaften der Johannes Gutenberg-Universität Mainz vorgelegt von Sarah Gebhardt geboren in Düren Mainz, 2008 Since Karl Wilhelm Scheele, Joseph Priestley and Antoine de thLavoisier discovered in the late 18 century that air is not an element but consists of several gases, scientists of the following centuries spared no effort to determine its components in detail. This is one more attempt. Abstract Within this doctoral thesis, biogenic emissions of several globally relevant halocarbons have been investigated in different environments. An airborne and a shipborne field campaign were performed as well as a laboratory study, to investigate the release of selected halocarbons namely, methyl chloride, methyl bromide, methyl iodide, dibromomethane, chloroform and bromoform to the atmosphere. The airborne study was focused on the tropical rainforest ecosystem while the shipborne measurements investigated naturally occurring oceanic plankton blooms. The laboratory experiments using dried plant material were made to elucidate abiotic production mechanisms occurring in organic matter.