The present invention provides a method for estimating the precipitable water in cloud and
sky atmosphere based on meteorological satellites, belonging to the technical field of
meteorological satellite detection.
Cloud detection is carried out using the
relative humidity threshold method based on the
atmospheric sounding profile, and the radiative
simulation calculations of the near-
infrared and thermal-
infrared water vapor channels of meteorological satellites in the case of cloud and
sky are carried out using the atmospheric
radiative transfer model MODTRAN. The near-
infrared and thermal-infrared
water vapor channels can detect the precipitable water in the
atmosphere above the cloud, and the numerical prediction model can provide the temperature,
humidity profile distribution of the whole
atmosphere and the total precipitable water in the atmosphere. It is assumed that the form of the
atmospheric profile in the numerical prediction is correct, but bias correction is required. Taking the
radiation of the near-infrared and thermal-infrared
water vapor channels and the temperature and
humidity profiles predicted by the model as inputs, a
convolutional neural network is used to construct an
estimation model for the precipitable water in cloud and
sky atmosphere. The present invention uses multi-band observations and numerical prediction model information, takes into account the atmospheric
radiative transfer process, and obtains a relatively high accuracy of the precipitable water in cloud and sky atmosphere.