Description: Das Projekt "Messungen kurzkettiger Alkohole and Aldehyde als wichtiger Vorläufer von troposhärischen Radikalen und Ozon: Entwicklung und Anwendung neuer Methoden zur Messung von Flüssen zwischen Biosphäre und Atmosphäre, sowie von troposphärischen Mischungsverhä" wird vom Umweltbundesamt gefördert und von Universität Bremen, Institut für Umweltphysik durchgeführt. 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.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Ozon ? Ammoniumverbindung ? Getreide ? Methanol ? Peroxid ? Fluss ? Bremen ? Außenluft ? Acetaldehyd ? Aceton ? Alkohol ? Futterpflanze ? Katalysator ? VOC ? Solarstrahlung ? Spektralphotometrie ? Spurengas ? Temperaturabhängigkeit ? Formaldehyd ? Heimtier ? Organische Verbindung ? Getreideproduktion ? Grünland ? Domestiziertes Tier ? Agrarökosystem ? Kohlendioxid ? Machbarkeitsstudie ? Massenspektrometrie ? Messtechnik ? Nutztier ? Pflanzenproduktion ? Photolyse ? Satellit ? Chemische Zusammensetzung ? Strahlungsmessung ? Temperaturmessung ? Wärmespeicher ? Ernte ? Fernerkundungsdaten ? Futtermittel ? Aldehyd ? Gasaustausch ? Photochemische Reaktion ? Schadstoffausbreitung ? Studie ? Daten ? Terrestrisches Ökosystem ? Troposphäre ? Oxidation ? Laborversuch ? Wasser ? Ozonbildung ? Beweidung ? Forschungsprojekt ? Landwirtschaft ? Atmosphäre ? Biosphäre ? Chemische Reaktion ? Grenzschicht ? Stoffstrom ? Ökosystem ? Datenerhebung ? Feuchtigkeit ? Atmosphärenchemie ? Fernerkundung ? Ozonabbau ? Anthropogener Einfluss ? PTR-MS ? Radikal [Chemie] ? Proton-Transfer-Reaction-Mass-Spectrometry ?
Region: Bremen
Bounding box: 8.83333° .. 8.83333° x 53.08333° .. 53.08333°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2003-01-01 - 2004-12-31
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