Applicability research of microwave radiometer in sea fog in Qingdao

Compared with L-band radiosonde, we evaluate the applicability of temperature and relative humidity profile data below 2 km height of a kind of new detection equipment, a microwave radiometer, installed at Qingdao National Basic Meteorological Observing Station in April to August 2021 and 2022. The results show that the temperature and relative humidity detected by microwave radiometer and L-band radiosonde respectively have relatively consistent changes at each altitude level. The mean error of relative humidity is within ±5% and both root mean square error and mean absolute error show an increasing trend with height until they become stable above 500 m. The mean error of temperature is within 2.5°C and the temperature of the microwave radiometer is higher than that of the L-band radiosonde. The mean error, root mean square error, and mean absolute error all increase first and then decrease with height with the mean error reaching the peak at about 600 m. In general, the relative humidity and temperature profile data of microwave radiometers possess certain reliability.