Details zur Publikation |
Kategorie | Textpublikation |
Referenztyp | Zeitschriften |
DOI | 10.1016/S0269-7491(03)00048-4 |
Titel (primär) | The annual course of TCA formation in the lower troposphere: a modeling study |
Autor | Folberth, G.; Pfister, G.; Baumgartner, D.; Putz, E.; Weißflog, L.; Elansky, N.P. |
Quelle | Environmental Pollution |
Erscheinungsjahr | 2003 |
Department | ANA |
Band/Volume | 124 |
Heft | 3 |
Seite von | 389 |
Seite bis | 405 |
Sprache | englisch |
Abstract | We present a modeling study investigating the influence of climate conditions and solar radiation intensity on gas-phase trichloroacetic acid (TCA) formation. As part of the ECCA-project (Ecotoxicological Risk in the Caspian Catchment Area), this modeling study uses climate data specific for the two individual climate regimes, namely "Kalmykia" and "Kola Peninsula". A third regime has also been included in this study, namely "Central Europe", which serves as a reference to somehow more moderate climate conditions. The simulations have been performed with a box modeling package (SBOX, photoRACM), which uses Regional Atmospheric Chemistry Mechanism (RACM) as its chemistry scheme. For this model a mechanism supplement has been developed including the reaction pathways of methyl chloroform photooxidation. The investigations are completed by a detailed sensitivity study addressing the impact of temperature and relative humidity. Atmospheric OH and HO2 concentrations and the NOx/HO2 ratio were identified as the governing quantities controlling the TCA formation trough methyl chloroform oxidation in the gas phase. Model calculations show a TCA production rate ranging between almost zero and 6.5 x 10(3) molecules cm(-3) day(-1) depending on location and season. In the Kalmykia regime the model predicts mean TCA production rates of 1.3x10(-4) and 5.4 x 10(-5) mug m(-3) year(-1) for the urban and rural environment, respectively. From the comparison of model calculations with measured TCA burdens in the soil ranging between 130 mug m(-3) and 1750 mug m(-3) we conclude that TCA formation through methyl chloroform photooxidation in the gas-phase is probably not the principal atmospheric TCA source in this region. |
dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=4816 |
Folberth, G., Pfister, G., Baumgartner, D., Putz, E., Weißflog, L., Elansky, N.P. (2003): The annual course of TCA formation in the lower troposphere: a modeling study Environ. Pollut. 124 (3), 389 - 405 10.1016/S0269-7491(03)00048-4 |