Abstract. Balloon-borne measurements of CFC11 (from the DIRAC in situ gas chromatograph and the DESCARTES grab sampler), ClO and O 3 were made during the 1999/2000 Arctic winter as part of the SOLVE-THESEO 2000 campaign, based in Kiruna (Sweden). Here we present the CFC-11 data from nine flights and compare them first with data from other instruments which flew during the campaign and then with the vertical distributions calculated by the SLIM-CAT 3D CTM. We calculate ozone loss inside the Arctic vortex between late January and early March using the relation between CFC11 and O 3 measured on the flights. The peak ozone loss (∼1200 ppbv) occurs in the 440-470 K region in early March in reasonable agreement with other published empirical estimates. There is also a good agreement between ozone losses derived from three balloon tracer data sets used here. The magnitude and vertical distribution of the loss derived from the measurements is in good agreement with the loss calculated from SLIMCAT over Kiruna for the same days.

Abstract. A new gas chromatograph was used to make measurements of halocarbons at the Cape Verde observatory during late May and early June 2007. The instrument demonstrated its potential for long-term autonomous measurements. Bromoform (CHBr3) exhibits the most variability of all the halocarbons observed, ranging from a background concentration of about 4 ppt to a maximum of >40 ppt during the course of the measurement period. Dibromomethane (CH2Br2) correlates well with CHBr3, suggesting a common regional source. Methyl iodide (CH3I) does not correlate with these bromocarbons, with base levels of around 1–2 ppt and some periods of much higher mixing ratios. Model studies with published bromocarbon emission rates do not reproduce the observations. Local emission magnitudes and CHBr3:CH2Br2 ratios must be increased more in line with the recent observations of Yokouchi et al. (2005) to improve the model to measurement comparison. Even when the model reproduces the observed bromocarbons, modelled BrO is much less than recent tropical observations (Read et al., 2008). A sea salt source seems the likely explanation. When high BrO is reproduced, the model agrees much better with the observed ozone changes, including diurnal variation, during the measurement period but it is suggested that a representation of iodine chemistry in the model is also required.

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This article outlines a possible mechanism for enlarging the New Zealand House of Representatives. Enlargement has been gathering increasing support among political observers as a way of enabling the house to carry out its functions more effectively. The present size of the house (84 members) is seen as too small for effective performance, particularly in those areas of public policy requiring expert knowledge, a very high level of ability and an increased parliamentary workload. Reasons for EnlargementThere appear to be four main reasons for enlargement of the house. First, with more members a greater pool of talent would be available for the selection of ministers. It can be strongly argued that for adequate political control of the *R. M. Alley is a teaching fellow and A. D. Robinson a senior lecturer, at

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