Upper air soundings during POLARSTERN cruise PS87 (ARK-XXVIII/4)

The upper air soundings are normally performed once a day to measure vertical profiles of air pressure, temperature, relative humidity and the wind vector. Helium filled balloons (TOTEX 600 g, 800 g) were used to carry Vaisala RS92-SGPW radiosondes. Whenever possible, the launches were performed about 10 UTC. Condensed measurements (TEMP Format FM-35) were transferred without delay into the Global Telecommunication System GTS were they contribute for the world wide weather forecasts. The profile data were taken every 5-10 seconds which result in a vertical profile resolution of about 25-50 meter. The profiles start at the helideck 10 m above sea level and terminate at the burst level of the balloons, normally at heights between 25 and 37 km.高空探测（upper air soundings）通常每日开展一次，用于获取气压、气温、相对湿度及风矢量的垂直廓线。本次探测采用充灌氦气的气球（TOTEX 600克、800克）搭载维萨拉RS92-SGPW无线电探空仪（radiosondes）。在条件允许的情况下，探空发射均安排在协调世界时（Universal Time Coordinated，UTC）10时左右开展。经压缩的观测数据（TEMP格式FM-35（TEMP Format FM-35））会即时上传至全球电信系统（Global Telecommunication System，GTS），为全球天气预报提供数据支撑。廓线数据的采样间隔为5至10秒，由此获得的垂直廓线分辨率约为25至50米。廓线数据的采集起点为海拔10米的直升机甲板（helideck），终点为气球的爆炸高度，通常介于25至37千米之间。