Instrument Problems of Radiosonde Measurements at 10 MB and above

Abstract

Today, when high-altitude soundings can be reached economically, there is a great need to measure temperature and pressure accurately at pressures below about 10 mb. In this paper the Finnish high-altitude radiosonde RS 16 is described with respect to the construction of the wire thermometer and the small pressure sensor. The radiation error and the lag of the wire are introduced and a report is made of comparability investigations with the normal version of the Finnish radiosonde using the twin-sounding technique. The results of a comparison with the RS 16, an international reference radiosonde, are also given. Some general results of the comparison between the German and Finnish reference sondes are presented.