Aerosol properties associated with air masses arriving into the North East Atlantic during the 2008 Mace Head EUCAARI intensive observing period: an overview

As part of the EUCAARI Intensive Observing Period, a 4-week campaign to measure aerosol physical, chemical and optical properties, atmospheric structure, and cloud microphysics was conducted from mid-May to mid-June, 2008 at the Mace Head Atmospheric Research Station, located at the interface of Western Europe and the N. E. Atlantic and centered on the west Irish coastline. During the campaign, continental air masses comprising both young and aged continental plumes were encountered, along with polar, Arctic and tropical air masses. Polluted-continental aerosol concentrations were of the order of 3000 cm(-3), while background marine air aerosol concentrations were between 400-600 cm(-3). The highest marine air concentrations occurred in polar air masses in which a 15 nm nucleation mode, with concentration of 1100 cm(-3), was observed and attributed to open ocean particle formation. Continental air submicron chemical composition (excluding refractory sea salt) was dominated by organic matter, closely followed by sulphate mass. Although the concentrations and size distribution spectral shape were almost identical for the young and aged continental cases, hygroscopic growth factors (GF) and cloud condensation nuclei (CCN) to total condensation nuclei (CN) concentration ratios were significantly less in the younger pollution plume, indicating a more oxidized organic component to the aged continental plume. The difference in chemical composition and hygroscopic growth factor appear to result in a 40-50% impact on aerosol scattering coefficients and Aerosol Optical Depth, despite almost identical aerosol microphysical properties in both cases, with the higher values been recorded for the more aged case. For the CCN/CN ratio, the highest ratios were seen in the more age plume. In marine air, sulphate mass dominated the sub-micron component, followed by water soluble organic carbon, which, in turn, was dominated by methanesulphonic acid (MSA). Sulphate concentrations were highest in marine tropical air - even higher than in continental air. MSA was present at twice the concentrations of previously-reported concentrations at the same location and the same season. Both continental and marine air exhibited aerosol GFs significantly less than ammonium sulphate aerosol pointing to a significant organic contribution to all air mass aerosol properties.

The Catholic Church and revolution in Ireland

Despite the involvement of radical socialists like James Connolly and the Irish Citizen Army in the 1916 Rising and the unanimous passing of the Democratic Programme (a socialist manifesto for the new Government) by the First Dáil in 1919, the Irish state has since its inception exhibited a highly conservative approach to social and economic policy, and politics generally in Ireland, North or South, have never faced a serious challenge from those seeking radical change. Several factors have played a part in this and this article focuses on one of these - the power and conservatism of the Catholic Church and its influence in shaping the political landscape. Despite a decline in recent years, the Church remains influential north and south of the Border in education provision, the current debates in relation to abortion and in culturally important aspects of life - baptism, communion and burial. In the past the Church’s political influence among Ireland’s majority Catholic community had been even more pronounced. The article begins by looking at the Church’s attitude to revolutionary change in Ireland historically before focusing on its influence in the North during the Stormont years and during the more recent ‘Troubles’ – 1969 - 98. It shows how the Church attempted to influence political thought and discourse in Ireland when it was at the height of its power. Whilst it is true that the Church was not a monolith, and there have always been individual priests who have adopted a more radical approach, the general thrust of the Church was conservative, attempting to ally itself with the power elites of the day where possible. It is this influence which appears to have stood the test of time despite attempts in past generations to radicalise the Irish population.