Methane profile orthogonal inversion method aiming at AIRS (atmospheric infrared sounder) hyper-spectrum satellite data

Abstract

The invention discloses a methane profile orthogonal inversion method aiming at AIRS (atmospheric infrared sounder) hyper-spectrum satellite data. The method concretely comprises the following steps that a secondary standard product of an AIRS hyper-spectrum satellite is utilized for obtaining atmospheric composition profile data under the conditions of different regions and different seasons; a group of sets which contain a great number of observation results and can represent the atmospheric composition profile data under the conditions of different regions and different seasons are built; a radiation transmission equation is utilized for simulating an atmospheric top layer emergent radiation brightness value on a target passage for each profile, in addition, the observation noise of an instrument is added for obtaining the simulated satellite sensor observation radiation brightness value; the sensitivity of the atmospheric composition and the temperature is analyzed according to the simulated radiation brightness value for selecting the inversion passage; training sample sets are subjected to empirical orthogonal function expansion, and an empirical orthogonal function regression coefficient is calculated; cloud-clearing radiation brightness standard products of the AIRS hyper-spectrum satellite data are obtained, and the obtained regression coefficient is used for inversion.

Description

technical field [0001] The present invention relates to the technical field of atmospheric component inversion in the field of satellite remote sensing, relates to a methane profile inversion method for AIRS hyperspectral satellite data, and in particular to a fast method for methane profile of AIRS hyperspectral satellite data based on empirical orthogonal function regression method inversion method. Background technique [0002] Methane is an important greenhouse gas, and its greenhouse effect per unit mass is greater than that of CO 2 20 times larger. So far, methane accounts for about 20% of the enhanced greenhouse effect, second only to CO 2 . The radiative forcing of methane emitted by humans is 0.48W / m 2 , probably CO 2 (1.66W / m 2 ) of one-third. Methane also plays an important role in the chemical processes of the troposphere and peace processes, such as the formation of formaldehyde (CH 2 O), carbon monoxide (CO) and ozone (O 3 ), thereby affecting the oxid...

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Problems solved by technology

In the physical inversion algorithm, there are two very difficult problems: first, the initial profile X a Do not deviate too much from the real situation, otherwise the convergent result cannot be obtained; secondly, the prior error covariance matrix S a It needs to best represent the true state of the parameters to be inverted in a statistical sense, otherwise it is difficult to c

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