Cloud-base height inversion method based on radio occultation detection data

Abstract

The invention discloses a cloud-base height inversion method based on radio occultation detection data, comprising the following steps of: firstly, giving statistics of distribution characteristics within the worldwide COSMIC occultation vertical sounding scope and calculating the probability of the cloud-base height inversion influenced by the COSMIC sounding scope; secondly, reading temperaturedata and water vapour pressure data from COSMIC occultation detection moist air data; thirdly, acquiring cloud-base height information with the combination of relative humidity variation profile inversion based on the method brought forward by Wang for determining the cloud-base height by using relative humidity profile data; finally, based on the method brought forward by Wang for determining the cloud-base height by using the relative humidity profile data, carrying out the cloud-base height inversion by the adoption of radiosonde detection data, and calculating the relative difference between the radiosonde cloud-base height inversion result and the COSMIC cloud-base inversion result. The cloud-base height inversion method provided by the invention makes up the defects that previous satellite remote sensing can not provide bottom cloud-base height information and the reliability of field observation is poor for the detection of the medium cloud-base height and the high cloud-base height.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, in particular to a cloud base height inversion method based on radio occultation detection data. Background technique [0002] Cloud base height, as an important cloud macroscopic physical parameter, plays a very important role in the energy exchange between the cloud layer and the surface and the water vapor cycle, and is the main content of the study of cloud physical characteristics. At the same time, the height of cloud base seriously restricts many combat units in modern military operations, such as reconnaissance and early warning, precision guidance, air combat and vertical landing. Therefore, it is of great significance to achieve accurate inversion and detection of cloud base height. At present, there are mainly three methods for inversion and detection of cloud base height: ground observation, satellite remote sensing and radiosonde detection. Among them, ground observation mai...

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Problems solved by technology

Among them, ground observation mainly includes visual observation, ceilometer, cloud curtain light and micro-pulse radar, etc., but its reliability in detecting the cloud base height of medium and high clouds is low, especially at night or when low clouds cover the whole sky. In this case, the detection accuracy is lower; satellite remote sensing has ambiguity in the detection of low clouds and cannot provide any information on the height of the cloud base, which is not conducive to the inversion of the height of the cloud base of low clouds; although radiosondes can use the measured temperature-dew point The temperature difference profile and the relative humidity profile realize the inversion of cloud base height, but the quality of radiosonde data decreases with the increase of height, and there are large errors in the measurement of water vapor pressure by radiosondes. In addition, the global radiosonde The number of instrument stations is limited, the distribution is uneven, and the detection data is only provided two times a day, which cannot meet the needs of high-precision detection of cloud base

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