Volatile Organic Compounds in the Po Basin. Part B: Biogenic VOCs
| Autor: | Stefan Reimann, Martin Steinbacher, S. Andreani-Aksoyoglu, J. Dommen, Carlos Ordóñez, F. C. GrÜebler, André S. H. Prévôt, Johannes Staehelin |
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| Rok vydání: | 2005 |
| Předmět: |
Hydrology
chemistry.chemical_classification Atmospheric Science Chemistry Diurnal temperature variation Air pollution medicine.disease_cause Trace gas Troposphere chemistry.chemical_compound Diurnal cycle Atmospheric chemistry Environmental chemistry medicine Environmental Chemistry Volatile organic compound Isoprene |
| Zdroj: | Journal of Atmospheric Chemistry. 51:293-315 |
| ISSN: | 1573-0662 0167-7764 |
| DOI: | 10.1007/s10874-005-3577-0 |
| Popis: | Measurements of volatile organic compounds (VOCs) were performed in the Po Basin, northern Italy in early summer 1998, summer 2002, and autumn 2003. During the three campaigns, trace gases and meteorological parameters were measured at a semi-rural station, around 35 km north of the city center of Milan. Bimodal diurnal cycles of isoprene with highest concentrations in the morning and evening were found and could be explained by the interaction of emissions, chemical reactions, and vertical mixing. The diurnal cycle could be qualitatively reproduced by a three-dimensional Eulerian model. The nighttime decay of isoprene could be attributed mostly to reactions with NO3, while the decay of the isoprene oxidation products could not be explained with the considered chemical reactions. Methanol reached very high mixing ratios, up to 150 ppb. High concentrations with considerable variability occurred during nights with high relative humidities and low wind speeds. The origin of these nighttime methanol concentrations is most likely local and biogenic but the specific source could not be identified. |
| Databáze: | OpenAIRE |
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