Der Strahlungsfehler der Radiosonde M 60und der Tagesgang der Lufttemperatur oberhalb der 500 mb-Fläche nach Messungen an der Äquatorstation auf der Atlantischen "Meteor"-Expedition 1965 (IQSY)

For the determination of the air temperature and its diurnal variation above the 500 mb-level at the equator station, at first the radiation error of the bimetal was investigated by means of a temperature comparison between the day- and night-ascents. The correction required can be obtained from an assembly of curves, that is represented from O to 90 degrees sunheight within 10 degrees distances for the pressure range from 300 to 3 mb. The error included amounts to about 10% of the correction value on account of the scattering of the temperature measurement. The mean diurnal variation of the air temperature is represented at the main pressure levels from 500 to 10 mb, but it is only recongnizable up to the 40 mb-level (about 22 km altitude). It amounts to 0.5 °C on the average. For higher altitudes the accuracy of the pressure- and temperature-measurements is no more satisfactory for this purpose