A Retrieval Method of Optical Depth of Martian Atmospheric Dust Aerosol

An optical depth and aerosol technology, which is applied in the field of satellite remote sensing atmospheric composition inversion, can solve the problems of huge calculation amount, atmospheric inversion error, unusability, etc., and achieves the effect of reducing calculation amount and improving calculation efficiency.

CN107798154BInactive Publication Date: 2020-09-11INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-09-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a Martian atmospheric dust aerosol optical depth retrieval method. The method comprises the steps of performing calibration on MEX-PFS data to obtain PFS observation radiance data and observation noises; performing sensitivity analysis on factors including dust aerosol, atmospheric temperature, carbon dioxide, surface temperature and surface emissivity, and selecting a dustaerosol retrieval spectrum section; by using a surface emissivity real value, an atmospheric background data initial value and a surface temperature initial value, generating a Martian atmospheric state vector initial value; at the dust aerosol retrieval spectrum section, calculating atmospheric layer top outgoing radiance under the atmospheric state vector initial value condition, and adding theobservation noises to obtain simulated PFS radiance; and retrieving an atmospheric state vector, and cyclically calculating the simulated PFS radiance to minimize a cost function. According to the method, the dust aerosol content retrieval can be stably, quickly and conveniently performed; and the influence of Martian surface contribution inaccuracy on atmospheric retrieval result precision is reduced.
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Description

technical field

[0001] The invention relates to the technical field of inversion of atmospheric components by satellite remote sensing, and relates to a fast inversion method for dust aerosol optical thickness. Background technique

[0002] Dust aerosols are an important component of the Martian atmosphere. Dust aerosols are suspended in the atmosphere all year round and large-scale dust storms erupt almost every year. The distribution and properties of Martian dust aerosols are related to the cycle of water vapor and carbon dioxide on Mars. Understanding the cycle and properties of dust aerosols will help to explore the Martian atmosphere.

[0003] Mars Express (MEX) is currently the Mars orbiter with the longest continuous observation time. Its planetary Fourier spectrometer (PFS) data has the inversion capability of various atmospheric components. important data on the interaction.

[0004] The current physical inversion method for monitoring dust aerosols on Mars uses ...

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Embodiment Construction

[0030] The present invention will be described more fully below in conjunction with the accompanying drawings, and exemplary embodiments of the present invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0031] The satellite data in the present invention selects the MEX-PFS data of the European Space Agency (only the original data are released at present). MEX is currently the longest Mars exploration satellite in orbit. PFS is a double pendulum Michelson interferometer, providing 200-8200cm -1 The data in the spectral range is divided into short-wave and long-wave channels, and the spectral sampling is 1cm -1 , with an effective resolution of 2cm -1 . Short wave channel spectrum ran...