Method for inversing vertical column concentration of carbon dioxide in environmental atmosphere by utilizing direct-radiation solar spectrum

Abstract

The invention discloses a method for inversing the vertical column concentration of carbon dioxide in environmental atmosphere by utilizing direct-radiation solar spectrum. The method comprises: performing first-order Taylor expansion on obtained direct-radiation solar spectrum to obtain linear superposition of solar normalization radiance, a column weight function of carbon dioxide and other interference factors, and a low-order polynomial; then utilizing an atmosphere radiation transmission model SCIATRAN to model the solar spectrum; and performing non-linear least squares fitting on an analog computation value and the direct-radiation solar spectrum, so as to derive the vertical column concentration of carbon dioxide. In the modeling process, observation physical parameters corresponding to recorded solar spectrum, instrument functions corresponding to the spectrum resolution of a spectrum detection system, a priori carbon dioxide profile and a priori interference factor profile, and aerosphere height and atmosphere sublayer quantity are detailedly considered, and the temperature and pressure intensity dependence characteristics of an infrared-band gas absorption cross section are effectively corrected; and by employing the method, the fluctuation rule of the vertical column concentration of carbon dioxide in environmental atmosphere can be accurately mastered.

Description

technical field [0001] The invention relates to the field of measuring the vertical column concentration of gas in the ambient atmosphere, in particular to a method for retrieving the vertical column concentration of carbon dioxide in the ambient atmosphere based on the direct solar spectrum. Background technique [0002] As the most important human greenhouse gas, carbon dioxide contributes the largest percentage to the global greenhouse effect, about 55%, due to its high content. Despite the magnitude of the impact, there are still large gaps in our understanding of natural and anthropogenic sources (or sinks) of CO2, partly because it is difficult to assess emissions from natural and anthropogenic atmospheric sources of CO2 with high rates of spatiotemporal variability. At present, more and more countries monitor changes in the concentration of carbon dioxide in the ambient atmosphere as the main basis for the formulation of emission reduction programs. [0003] and SO w...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for retrieving the vertical column concentration of carbon dioxide in the ambient atmosphere based on the direct solar spectrum, so as to solve the problem of relatively complicated observation methods in the prior art, relatively low signal-to-noise ratio of the measurement spectrum, and uncorrectable gas absorption cross section. The inversion accuracy is low due to the dependence of temperature and pressure on the temperature and pressure, and it is impossible to accurately distinguish the fluctuation law of the concentration of the vertical column of greenhouse gas carbon dioxide.

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