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Simon P. Alexander and Toshitaka Tsuda

troposphere below 10 km. Two main layers are visible at 5 and 8 km, which showed a descending motion during the campaign. Periods of convection, which are defined here as times where vertical wind variances exceeded 0.01 m 2 s −2 , occurred each day throughout the campaign period. Convective activity, duration, and height are recorded in Table 4 . Surface rainfall was only recorded on 2 August. The effects of convection can be seen in the N   2 oscillations during each afternoon. The convection on 3

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Thierry Leblanc, I. Stuart McDermid, and Robin A. Aspey

recorders to the acquisition PC. Miniature photomultiplier photon counting modules (Hamamatsu H5783P) are used for the detectors. A single gated Hamamatsu R7400 photomultiplier (PMT) is used for the 355-H channel to reduce signal-induced noise (SIN) for near-field returns. In addition to extending the dynamic range of the photon counting system, the present six-channel configuration dedicated to water vapor measurements enables better corrections for pulse pile-up saturation effects. The 387/407L

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V. Bellantone, I. Carofalo, F. De Tomasi, M. R. Perrone, M. Santese, A. M. Tafuro, and A. Turnone

1. Introduction The importance of a quantitative and qualitative assessment of atmospheric aerosol characteristics has been recognized for many years, since aerosols are responsible for direct and indirect effects on atmospheric processes and hence on climate (e.g., Schwartz and Andreae 1996 ). Human health is also expected to be quite affected by the aerosol fine fraction. The variety of sources and chemical processes that contribute to the aerosol creation and their relatively short lifetime

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