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Photochemistry, atmospheric, impact

To study the impact of biogenic sources of hydrocarbons on gas phase photochemistry in the atmosphere, new isotopic ratio-based techniques are required. For example, ultra-high volume collection of aldehydes with separation of formaldehyde and acetaldehyde (or their derivatives), and subsequent 3q an[Pg.278]

Non-methane hydrocarbons (NMHCs such as ethane, ethene, propane, propene, and isoprene) are trace atmospheric constituents that play an important role in both providing a sink for hydroxyl radicals and in controlling ozone concentrations (Donahue and Prinn, 1990). The oceans are known to be a source of NMHCs to the atmosphere, although globally they are significantly smaller than terrestrial sources. However, the main marine-produced NMHCs, ethane and propene, may have an important local impact on atmospheric photochemistry (Plass-Dulmer et al., 1995), particularly in... [Pg.2923]

The EUROCHAMP project integrates the most important environmental reaction chambers in Europe for studying atmospheric processes into a Europe-wide infrastructure. These facilities were created by multinational initiatives to study the impact of atmospheric processes on regional photochemistry, global change, as well as cultural heritage and human health effects under most realistic conditions. [Pg.296]

A prerequisite to simulate the impact of iron complex photochemistry in atmospheric aqueous systems is the characterization of its efficiency. Figure 10 presents an overview of quantum yield measurements in the ferrioxalate system as a function of wavelength. [Pg.23]

Iron complex photolysis is mie of the processes that produce reduced iron (Fe(n)) in a highly oxidizing enviromnent like the atmospheric aqueous phase. There are numerous other processes such as reactions with HO species or Cu(I)/ Cu(n) which can reduce or oxidize iron in the troposphere. These reactions can take place simultaneously and cause iron to undergo a so-caUed redox-cycling [167]. Because of the large number of complex interactions in the atmospheric chemistry of the transition metal iron, it is useful to utilize models to assess the impact of the complex iron photochemistry. [Pg.29]

Clearly, enhanced radical production through the range of photochemical mechanisms discussed in this chapter could have a significant impact oti atmospheric chemistry. Assessing the full extent by which they influence the atmosphere will certainly require further research. We look forward to a new era of atmospheric photochemistry one which recognizes that the full solar spectrum should be considered as important to the chemistry which affects us all. [Pg.42]


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