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As part of the Danish NEAREX project a three-dimensional Eulerian hemispheric air pollution model is used to study the transport and concentrations of atmospheric CO2in the North East Atlantic region. The model domain covers the major part of the Northern Hemisphere and currently the model includes simple parameterizations of the main sinks and sources for atmospheric CO2. One of the objectives of the project is to study and maybe quantify the relative importance of the various sinks and source types and areas for this region. In order to do so the model has been run with differentiated source types. Here the model setup and the used parameterizations will be described. The model is validated by comparing the results with atmospheric measurements from four monitoring stations in or close to the northern part of the North Atlantic. Some preliminary model results will be shown and shortly discussed.

The microwave spectra of the two conformers (cisand trans) of 3-fluorobenzoyl fluoride in their ground states and in two excited torsional states have been assigned. Four different potential functions (with cosines only for symmetry reasons, and Vn= 0, n≥ 5) reproducing the experimentally observed inertial defect variations are discussed; they may be represented as (V1/hc, V2/hc, V3/hc, V4/hc) (cm−1) = I: (0, 2175, 56, −164); II: (−63, 2175, 63, −164); III: (0, 1519, 56, 0); and IV: (−63, 1519, 63, 0). In principle there are different barriers starting from cisand trans; we have, however, chosen the value of V2(1519 cm−1) to represent the barrier for the sake of comparison with 4-fluorobenzoyl fluoride and the correspondingly substituted nitrobenzenes. This barrier does notfit in with the trend observed for 3- and 4-fluoronitrobenzene. The derived wavenumbers for the COF torsional mode of the cisand the transform are, respectively, 52.29 and 56.24 cm−1.