Description: Das Projekt "Der Beitrag reaktiver Halogenarten auf die Oxidationsfaehigkeit der reaktiven Halogenarten in der Troposphaere: Zyklen - Mechanismen - und Feldbeobachtungen - HALOTROP-CYMFO" wird vom Umweltbundesamt gefördert und von Universität Heidelberg, Institut für Umweltphysik durchgeführt. This study is a contribution to the part of the programme dealing with the Oxidation Capacity of the Troposphere. It will be achieved by coordinated field-, laboratory- and modelling investigations of reactive halogen species, their precursor and storage species, and the reaction mechanisms involved. Field measurements will include direct determination of halogen oxides by Differential Optical Absorption Spectroscopy (DOAS) at sub-ppt levels. The laboratory studies will close many gaps in our knowledge of RHS related homogeneous and surface-catalyzed reactions including iodine chemistry. The latest data from field and laboratory studies will be assembled in trajectory- and limited area 3D models, which will help to understand the results of the field campaigns as well as to assess the regional impact of RHS chemistry. A further important part of this study will be the assessment of a possibly anthropogenic influence on RHS sources and the transformation mechanisms within the RHS reservoir. Thus possible mechanisms changing the tropospheric oxidation capacity due to human activities can be investigated. While a central question concerns the importance of release of RHS from sea salt aerosol, for instance due to reaction of anthropogenic NOy species (like N205, NO2) with sea salt aerosol, the detailed investigation of those processes is the aim of a parallel study with the sub-title 'Sea Salt Aerosols: Laboratory Investigation of Heterogeneous Halogen Activation in the Troposphere (HALOTROP-SALT). Areas where enhanced levels of RHS are to be expected (like polluted coastlines or polar regions) will be identified. Regional processes involving RHS will be set into a global perspective.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Heidelberg ? Iod ? Halogen ? Oxid ? Stickstoffdioxid ? Salz ? Aerosol ? Halogenverbindung ? Spektralanalyse ? Vorläufersubstanz ? Daten ? Oxidation ? Reaktionsmechanismus ? Studie ? Troposphäre ? Meeresgewässer ? Polargebiet ? Modellierung ? Küstenlinie ? Wirkungsmodell ? Anthropogener Einfluss ? Chemische Reaktion ? Laboruntersuchung ? Globale Aspekte ? DOAS ? Konzentrationsmessung ? Meersalz ? Oxidationskapazitaet ? RHS ? Reactive-Halogen-Species ? Reaktionsmodell ?
Region: Baden-Württemberg
Bounding boxes: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1996-02-01 - 1998-01-31
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