Two sets of instruments were positioned on the bow and on top of ship's masts. The sea surface temperature was measured by infrared thermometers (PRT-5, Minirad-RS20, Everest 112 ALCS, Tasco THI-500). The radiative properties of the atmosphere (LDR) was investigated by two Eppley Precision Infrared Pyranometers mounted on one of the ship's masts on the upper deck at about 15m above sea level. Full information on the rationale and on instrumental deployment can be found on [Schiano et al.(1993),Schiano (1996),Schiano et al.(2000)]. Figures 7, 8, 9 and 10 show the sensors. The 1Hz PC based data acquisition was complemented by meteorological observations by an automated station and by hourly manual recordings. Vaisala Radiosondes were also launched (see Tab.3) to study pressure, temperature and wind components up to 20 Km into the lower stratosphere. The GPS data in the telemetry messages were used for accurate probe location.
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