Improved meteorological measurements from buoys and ships (IMET) : preliminary comparison of precipitation sensors

Abstract

Rainfall data obtained from an optical rain gauge and a capacitive siphon rain gauge are analyzed and discussed. These sensors were developed for unattended use and are being considered for use at sea on ships and buoys.

Relative Humidity over the West Florida Continental Shelf

“…Six moorings carried meteorological packages that measured wind velocity, air temperature (AT), SST, RH, and barometric pressure (BP); some also had rainfall and shortwave and longwave radiation sensors. Figure 1 shows (Crescenti et al 1990). The ASIMET package uses the same sensors as the IMET but is manufactured by Star Engineering instead of ALDEN.…”

“…Subsequent manufacturing improvements to the MP-100 sensor may have eliminated this problem (Breaker et al 1998b), making these sensors more reliable at high humidities. Crescenti et al (1990) also tested various sensors prior to developing the IMET package. Among those tested was the Hygrometrix 8503A, which is a cellulose crystallite sensor and is therefore a kin of the Hygrometrics 1020SHT (manufactured by Hygrometrix) currently used in the Weatherpaks.…”

Calibration history of some Rotronic MP-100 and Vaisala Humicap relative humidity sensors

“…Of all these variables, relative hundity is a significant parameter since it is required for the calculation of latent heat flux, which is generally the largest heat flux from the sea to the atmosphere. After testing several prospective sensors, the Rotronic MP-100F was selected for use in the IMET relative hUITdity module (Crescenti et al, 1990), because of its accuracy and reliability.…”