Cloud condensation nucleus number concentration vertical profile inversion method based on multi-wavelength laser radar

Abstract

The invention discloses a cloud condensation nucleus number concentration vertical profile inversion method based on a multi-wavelength laser radar. The method comprises the steps: adopting the multi-wavelength laser radar to detect aerosol optical parameters; correcting the influence of the relative humidity on aerosol optical parameters by utilizing sounding; selecting an aerosol model with bimodal logarithmic normal distribution, and establishing a T-matrix scattering model considering the shape of aerosol particles; establishing a lookup table associated between aerosol optical parametersand spectral distribution parameters of different types of aerosols; based on aerosol optical parameters detected by a laser radar, obtaining corresponding spectral distribution parameter values through a lookup table, and obtaining the result of the cloud condensation tuberculosis number concentration vertical profile through critical activation radius calculation. The method has the advantages that the inversion accuracy of the cloud condensation tuberculosis number concentration vertical profile under different types of aerosols and different relative humidity conditions is improved, the automatic inversion of the cloud condensation tuberculosis number concentration vertical profile is realized, and more accurate observation data is provided for improving a parameterization scheme of the cloud condensation tuberculosis number concentration in a climate mode.

Description

Technical field: [0001] The invention relates to the technical field of laser radar, in particular to a cloud condensation nuclei concentration vertical profile inversion method based on multi-wavelength laser radar. Background technique: [0002] Cloud condensation nuclei (CCN) refer to some atmospheric aerosol particles that can be activated into cloud droplets under a certain supersaturation condition in the cloud, which can change the microphysical process of the cloud, and then affect the optical properties of the cloud, the life cycle and Precipitation, etc., produce indirect climate effects and are one of the most important uncertainty factors in current climate models. With the development of modern industrial and agricultural production and the expansion of human activities, the spatial and temporal distribution of aerosols is becoming more and more complex. Although a large number of aerosol observation experiments have been carried out at home and abroad, the ind...

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Problems solved by technology

When this instrument is used alone for ground observation of CCN, the horizontal spatial coverage is small, which cannot reflect the overall characteristics and evolution process of aerosols

In addition, the most prominent deficiency is that due to the inhomogeneity of the vertical distribution of aerosol, there is a large difference in the CCN characteristics near the ground and cloud base

However, at present, most researchers need to combine other instruments on the ground to indirectly obtain the vertical distribution information of CCN number concentration, and the observation cost is high; and in the inversion process, the Mie scattering model only applicable to spherical particles is used, while in fact aerosol particles Not strictly spherical, especially for dust aerosols; the influence of aerosol hygroscopicity under different relative humidity conditions on the inversion results of CCN number concentration has not been considered, and there are large errors in the inversion results

At present, there is no mature inversion method for CCN number concentration vertical profile based on the optical parameters of multi-wavelength lidar in China.

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