Description: Das Projekt "Feldmessstudie der naechtlichen Oxidation von natuerlich emittierten Kohlenwasserstoffen durch NO3" wird vom Umweltbundesamt gefördert und von Max-Planck-Institut für Chemie (Otto-Hahn-Institut) durchgeführt. Objective: The objective of this research is to improve the understanding of the tropospheric behaviour of the night time radical no3 by field measurement studies. General information: the experimental aims are summerised in the following manner: 1) simultaneous measurements of no3 and biogenically emitted hydrocarbons above wooded areas (such observations will confirm and establish the nature of the tropospheric interaction between these species); 2) the measurement of vertical profiles of biogenically emitted hydrocarbons and no3 together with the necessary meteorological parameters, such as the vertical profile of temperature and wind speed, at night (from this data the night time emission rate of isoprene and terpenes from the canopy and the vertical transport fluxes can be estimated); 3) observations at night of the time profiles of no2 and no3 together with measurements of hno3, o3, relative humidity, isoprene and terpenes to investigate the mechanism of the reaction between no3 with biogenically emitted hydrocarbons; (the rate of removal of no2, and rates of production of no3 and hno3 yield information about the mechanism of the no3 terpene reaction). To achieve this aim the research groups from Mainz and Rome, will join together in a series of field measurement campaigns to investigate directly this interaction. The detection techniques to be employed in this study are those which have been developed by the two groups. Measurements of the free radical species NO2 and NO3 will be made by long path absorption spectroscopy using a does instrument (Mainz). During the course of this project an instrument will be modified according to the requirements of this application. The hydrocarbons will be collected using absorption traps and subsequently analysed using the selected ion detection mode of a gc-mass spectrometer (Rome). Hno3 will be collected by high efficiency denuder tubes and subsequently measured as nitrate by ion chromatography (Rome). O3 concentrations will be measured by UV absorbance. Though at night the no concentration is expected to be small because of reaction with o3 and no3, a check of the no concentration will be made using a chemiluminescence detector. The field measurement campaigns will take place in Italy for the following reasons. Firstly the warmer and drier conditions in southern Europe relative to northern Europe lead to higher rates of emission of terpenes from plants and to higher equilibrium concentrations of no3. Secondly the generally lower relative humidity at night in southern Europe as compared with northern Europe reduces the influence of hydrometeors on the behaviour of no3 and n2o5. One of the most important tasks will be the selection of the most appropriate site for these experiments from those already used by the Italian research group for hydrocarbon measurements...
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Chemilumineszenz ? Ozon ? Windgeschwindigkeit ? Mainz ? Rom ? Lumineszenz ? Messgerät ? Meteorologischer Parameter ? Terpene ? Nitrat ? Alicyclischer Kohlenwasserstoff ? Sensor ? Isopren ? Nitratbestimmung ? Salpetersäure ? Stickstoffdioxid ? Temperaturverteilung ? Blei ? UV-Strahlung ? Kohlenwasserstoff ? Italien ? Absorptionsspektralanalyse ? Emissionsmessung ? Spektralanalyse ? Emissionsdaten ? Stickoxide ? Strahlungsmessung ? Temperaturmessung ? U-Bahn ? Gaschromatografie ? Messprogramm ? Emissionsquelle ? Ionenchromatografie ? Nordeuropa ? Massenspektrometrie ? Südeuropa ? Waldfläche ? Emission ? Schadstoffabbau ? Studie ? Naturstoff ? Feldstudie ? Troposphäre ? Vertikalprofil ? Ionen ? Pflanze ? Oxidation ? Naturraum ? Reaktionsmechanismus ? Daten ? Messverfahren ? Schadstoffverhalten ? Stoffkreislauf ? Stofftransport ? Kenngröße ? Chemische Reaktion ? Umweltschutz ? Wald ? Selektivität ? Radikal [Chemie] ? Zeitverlauf ?
Region: Rheinland-Pfalz
Bounding box: 7.5° .. 7.5° x 49.66667° .. 49.66667°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1988-03-01 - 1991-10-31
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