A new tethered balloon-borne payload for fine-scale observations in the cloudy boundary layer

摘要

A new scientific payload is introduced for fine-scale measurements of meteorological (wind vector, static air temperature, humidity, and air pressure) and microphysical (aerosol particles and cloud droplets) properties, suspended below a tethered balloon. The high resolution sensors and the tethered balloon are described. Measurements in a lifted fog layer from a first field campaign are presented. The detailed investigation of the fog/haze and the temperature inversion layer demonstrates the damping influence of the fog on temperature fluctuations, while the wind fluctuations are significantly decreased by the evolving temperature inversion, which was about 30 m above the fog layer. From spectral analysis the noise floors of the high-resolution sensors are determined to 10~(-6) kg m~(-3) for the L WC (liquid water content) and 4 mK for the fast temperature sensor (UFT-B). The correlation between temperature and LWC structures in shallow haze layers is investigated. The release of latent heat andthe corresponding warming in the haze of about 0.1 K could be quantified.