4 results about "Atmospheric column" patented technology

This invention discloses a method for inverting atmospheric N2O column concentration based on thermal infrared satellite remote sensing, belonging to the field of atmospheric environment remote sensing technology. The method includes: acquiring and preprocessing satellite observation data; selecting a specific spectral range as the inversion characteristic spectral region; introducing a fast radiative transfer model to construct a forward simulation operator to simulate the radiance of the top atmospheric layer; selecting N2O-sensitive characteristic bands with high signal-to-noise ratio and low interference based on a channel optimization strategy using the N2O / CO2 Jacobi intensity ratio; constructing an extended state vector, using surface temperature as an unknown parameter and performing joint optimal estimation iterative inversion with the N2O profile to correct the surface temperature in the reanalysis data, thereby achieving high-precision inversion of N2O atmospheric column concentration. This invention transforms surface temperature from a fixed input parameter into a state variable to be inverted, effectively decoupling surface temperature error from the N2O signal, eliminating systematic bias, and significantly improving the inversion accuracy of N2O column concentration.

This application relates to the field of radiometric calibration technology, providing a method and apparatus for quantitative evaluation of satellite radiometric calibration fields based on an airship platform. The method includes: constructing an optimized surface directional reflectance function based on multi-angle surface reflectance data collected by an unmanned aerial vehicle (UAV) and ground-measured reference data; constructing an apparent radiance function of the top of the atmosphere based on atmospheric column data collected by the airship platform, the optimized surface directional reflectance function, and ground-measured reference data; and retrieving an evaluation index of the satellite radiometric calibration field based on the deviation between the output value of the apparent radiance function of the top of the atmosphere and the satellite measured value. This application effectively overcomes the shortcomings of existing technologies, such as temporal discontinuity, strong meteorological constraints, and limited spatial representativeness, achieving high-frequency, high-precision, and high-stability quantitative evaluation of the radiometric calibration field.

The invention provides an aerosol micro-physical property profile determination method, device and equipment and a medium, and the method comprises the steps: obtaining atmospheric whole-layer column average aerosol volume scale spectral distribution and multi-wavelength complex refractive indexes of a plurality of ground sites in different time periods, and obtaining monitoring data including a real part and an imaginary part; constructing a coarse and fine modal aerosol six-parameter distribution database according to the monitoring data, and clustering the database to generate a plurality of coarse and fine modal aerosol scale spectrum distribution models; and each model calculates a preset wavelength backscattering coefficient calculation value based on a Mie scattering theory, performs layer-by-layer iterative comparison on the preset wavelength backscattering coefficient calculation value and corresponding wavelength observation values of different altitudes of the spaceborne laser radar by using a preset cost function, and inverts an aerosol micro-physical property profile. By adopting the scheme, high-precision and large-scale aerosol micro-physical property profile inversion can be realized, so that atmospheric aerosol monitoring research is effectively supported.