Mars atmospheric water vapor content retrieval method

Abstract

The invention relates to a mars atmospheric water vapor content retrieval method. The mars atmospheric water vapor content retrieval method comprises the following steps of calibrating to obtain the PFS radiance brightness and the observation noise based on MEX-PFS original data; generating a mars atmospheric state vector initial value based on known mars data, and calculating a PFS simulated radiance brightness by utilizing a mars radiation transmission model, further inverting to obtain the surface temperature, the atmospheric temperature profile and the dust aerosol optical thickness of themars and enabling a cost function to be minimized; selecting a water vapor inversion section; changing the resolution of MEX-PFS data and reducing the observation noise; calculating the width broadening value of a water vapor absorption line; adopting the surface temperature, the atmospheric temperature profile and the dust aerosol optical thickness of the mars as prior atmospheric data, calculating the real water vapor content under the width broadening value condition of the water vapor absorption line. For MEX-PFS data, the water vapor content retrieval method is small in error, stable, fast and convenient.

Description

technical field [0001] The invention relates to the field of remote sensing, and relates to a method for inverting the water vapor content of the Martian atmosphere. Background technique [0002] Water vapor is the most violently changing component in the Martian atmosphere. Although the content is low, it is an important component for studying the Martian atmosphere and climate change. Since the beginning of Mars exploration, water vapor has been a hotspot and difficulty in Mars exploration. The water vapor cycle is complex and is an important indicator of the state of the Martian atmosphere and surface, affecting the interaction of atmospheric storage (water vapor, clouds) and surface storage (polar cap, surface, and possibly surface frost). Variations in water vapor content are closely related to the behavior of polar cap ice sheets and their seasonal cycles, and can also indicate the transformation of volatile species in the atmosphere and surface sediments, atmospheric...

AI Technical Summary

Problems solved by technology

[0005] In many inversion algorithms, the surface emissivity is assumed to be uniform, and the influence of dust aerosols is ignored; the brightness temperature of the surface temperature cannot accurately represent the surface temperature, and errors are introduced; 2 The content accounts for 95%, and the absorption line width of Martian water vapor is replaced by CO 2 Broadening, direct use of the Earth's water vapor absorption linewidth inversion causes obvious errors; in addition, the data of the Mars Express Planetary Fourier Spectrometer (MEX-PFS) is noisy, and it is impossible to directly use a single channel data to invert the true water vapor content

Images