Total column ozone detection method

Abstract

The invention relates to a total column ozone detection method, which contains the following steps of: acquiring radiant brightness detection data of a spaceborne UV total ozone detector; determining on-orbit calibration coefficient of each channel step by step according to total ozone reference data and radiative transfer equation; extracting ozone spectral information from the radiant brightness detection data, and carrying out inversion on the ozone spectral information according to the on-orbit calibration coefficient to obtain the total column ozone. By the utilization of the total ozone data observed by a satellite with a good calibration effect and with the combination of the radiative transfer equation, calibration coefficient correction is carried out step by step on each channel. Therefore, the limitation of a traditional cross calibration method is solved, and UV total ozone can be accurately determined when there occur enormous mistakes in laboratory calibration before the spaceborne UV ozone detector is launched or when onboard calibration equipment fails due to a dramatic change of performance during the satellite operation process.

Description

technical field [0001] The invention relates to the field of satellite detection, in particular to a method for detecting the total amount of atmospheric ozone column. Background technique [0002] The calibration of satellite detectors refers to the process of determining the correspondence between satellite detection signals (analog signals or digital signals) and physical quantities (such as temperature, brightness, etc.). In general, the satellite detector is tested in the laboratory before the satellite is launched to determine the calibration coefficient used to convert the satellite detection signal into a physical quantity. During the orbiting process of remote sensing satellite detectors, the detected physical quantities are often deviated due to inaccurate calibration coefficients determined by the laboratory before the satellite launch. The attenuation of the sensor during the operation of the satellite will also lead to deviations in the detected physical quanti...

AI Technical Summary

Problems solved by technology

We first conducted an analysis using the on-board equipment, and found that the on-board calibration equipment, that is, the solar irradiance observation results also deviate greatly from the normal results, so we cannot use the on-board calibration equipment for error correction

Using the commonly used cross-comparison between different satellites, it is found that due to the harsh conditions, that is, the two satellite observations must be completely synchronized, so the number of available comparison samples is not enough, generally only in high-latitude regions A small number of samples that meet the requirements were found, but due to the large solar zenith angle in high latitudes, the solar ultraviolet radiation scattered by the atmosphere is relatively weak, so it is impossible to analyze the statistics between the observation results of Chinese satellites and the observation results of foreign satellites in the entire dynamic range. law

The preliminary conclusion is that a major mistake occurred in the laboratory calibration coefficient of the total ultraviolet and ozone detector of Fengyun-3 satellite, and the calibration equipment on the satellite also failed, and the correction of the calibration coefficient cannot be solved by conventional methods

If it cannot be resolved, it means that the satellite launch has completely failed

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