This paper discusses our research on the interannual variability in the Barents Sea thermal frontal zones. The extent of the frontal zones and their mean temperature gradients at 50 m depth in August–September 1960–2017 were estimated for an area between 73–78°N and 15–43°E, where the frontal zones are more evident. Thermal frontal zones were identified in areas where temperature gradients exceeded 0.04°C km−1. Since the beginning of this century, the extent of the frontal zones has been decreasing and temperature gradients have been weakening. From the 1960s to the 2010s, the decadal mean centroids of thermal frontal zones shifted northeastwards by 150 km.
Partial' cross sections for single electron capture in low to intermediate energy collisions of Ar6+ with He have been calculated in a simple two-electron atomic expansion. The calculated results are in good agreement at high energies with experimental results based on translational energy spectroscopy. At lower energies there is a 30% deviation in the 4p cross section and the comparison with the 3d cross section becomes poor. To understand this discrepancy, theoretical energy gain spectra have been deduced. Contributions from individual final states are well resolved at high energies, but there is a significant spectral overlap at lower energies, implying that a standard analysis of experimental spectra may lead to inaccuracies in the determination of partial cross sections. The observed deviation between theory and experiment may be attributed to this effect.
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