Description: Research in the group focuses on the understanding of the atmospheric budgets of oxygenated volatile organic compounds, short OVOCs, a project funded by the Deutsche Forschungsgemeinschaft (DFG) in its Emmy-Noether-Programme. Laboratory and field measurements in the boundary layer are carried out to study biosphere-atmosphere exchange of OVOCs such as acetone, methanol, acetaldehyde and other trace gases. Project kick-off was January 2003, first field measurements were carried out in summer 2003.The objectives of this research project are: - to expand and improve the current knowledge of (O)VOCs, in particular methanol, in the troposphere; - To develop a method to measure methanol mixing ratios in the troposphere based on the improved flourimetric measurement of formaldehyde; - to measure and interpret fluxes of these OVOCs in managed ecosystems, focusing on agricultural ecosystems for grain and forage production, and mid-latitude grasslands; - to relate measured fluxes to their environmental drivers, such as temperature, incident radiation, or humidity, and their anthropogenic drivers, such as harvesting or grazing of domestic animals; - to enhance the current capabilities of the Institut für Umweltphysik (IUP), University of Bremen, for interpreting/validating 1) satellite and ground-based data on formaldehyde, and 2) ground based data on peroxy radicals as acquired through the IUP s TROLAS group; - to generate synergistic products combining remote sensing data and flux measurements. This objective involves collaboration with IUP researchers using remote sensing techniques, will commence with a feasibility study on a limited spatial scale, and will carry the second phase of the project into subsequent research projects/objectives once the measurements have been successful. The techniques we use are Proton Transfer Reaction-Mass Spectrometry (PTR-MS) and photolytic detection of formaldehyde. In more detail, we will be measuring: - tropospheric mixing ratios of oxygenated VOCs at high time resolutions (0.1 to 10 Hz); - OVOC fluxes using eddy covariance (EC) and relaxed eddy accumulation (REA); - formaldehyde photolytically in the liquid phase after cyclization with acetylacetone in the presence of NH4+; - the conversion of methanol to formaldehyde in ambient air using a commercial catalyst; - fluxes of momentum, heat, water and CO2, and later ozone using standard micrometeorological techniques.
SupportProgram
Origins: /Bund/UBA/UFORDAT
Tags: Ozon ? Ammoniumverbindung ? Getreide ? Methanol ? Peroxid ? Heimtier ? Acetaldehyd ? Aceton ? Alkohol ? Futterpflanze ? Katalysator ? VOC ? Solarstrahlung ? Spurengas ? Temperaturabhängigkeit ? Formaldehyd ? Massenspektrometrie ? Ernte ? Fernerkundungsdaten ? Futtermittel ? Aldehyd ? Grünland ? Domestiziertes Tier ? Agrarökosystem ? Kohlendioxid ? Machbarkeitsstudie ? Messtechnik ? Nutztier ? Pflanzenproduktion ? Photolyse ? Satellit ? Strahlungsmessung ? Wärmespeicher ? Organische Verbindung ? Vorläufersubstanz ? Getreideproduktion ? Beweidung ? Terrestrisches Ökosystem ? Oxidation ? Photochemische Reaktion ? Gasaustausch ? Schadstoffausbreitung ? Studie ? Chemische Zusammensetzung ? Troposphäre ? Daten ? Laborversuch ? Wasser ? Ozonbildung ? Forschungsprojekt ? Atmosphärenchemie ? Ozonabbau ? Anthropogener Einfluss ? Landwirtschaft ? Biosphäre ? Chemische Reaktion ? Stoffstrom ? Feuchtigkeit ? Atmosphäre ? Datenerhebung ? Fernerkundung ? Ökosystem ? Proton-Transfer-Reaction-Mass-Spectrometry ? PTR-MS ? Radikal [Chemie] ?
Region: Bremen
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2003-01-01 - 2004-12-31
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