Biogenic VOCs types

In a second part of the work, a Structure-Activity Relationship has been developed for the addition of OH to (poly)alkenes. It was shown that the total rate constants can be expressed in very good approximation by a sum of partial, site-specific rate constants for addition to a given (double-bonded) carbon atom, the values of these partial rate constants depending solely on the stability-type of the ensuing p-hydroxy radical. The SAR is particularly useful in that it also allows the prediction of the detailed primary product distributions of (poly)alkene + OH reactions. Therefore, the SAR is a powerful tool in the modeling of the tropospheric OH-initiated oxidation of biogenic VOC. 

Table 5.2 provides a summary of the environments in which eddy covariance measurements of VOC fluxes using PTR-MS have been made. For convenience and for completeness other methodologies for determining biogenic flux using PTR-MS and ecosystem types other than forests, such as alfalfa fields [81], are included in the table. 

---