發(fā)布時(shí)間：2019-03-29 18:27

【摘要】：激光雷達(dá)是探測(cè)大氣氣溶膠光散射特性的有力工具。雷達(dá)比和退偏比是激光雷達(dá)探測(cè)氣溶膠時(shí)的兩個(gè)重要參量,二者存在著一定的相關(guān)關(guān)系。然而目前關(guān)于于雷達(dá)比和退偏比的研究多是獨(dú)立進(jìn)行,缺乏必要的交叉,限制了氣溶膠光散射特性的深入研究。本文采用離散偶極子近似法研究了非球形氣溶膠粒子的光散射特性,并通過相關(guān)性分析和數(shù)據(jù)擬合獲得了雷達(dá)比和退偏比的相關(guān)關(guān)系。研究結(jié)果對(duì)氣溶膠精細(xì)分類、氣溶膠光學(xué)特性精細(xì)反演等均具有重要意義。論文首先采用離散偶極子近似法計(jì)算了不同形狀、粒子取向和復(fù)折射率的單顆粒非球形氣溶膠粒子的光散射特性,分析了各參數(shù)對(duì)雷達(dá)比和退偏比的影響。在此基礎(chǔ)上研究了軸比對(duì)群體橢球氣溶膠雷達(dá)比和退偏比的影響。當(dāng)軸比增加時(shí),沙塵氣溶膠的雷達(dá)比先增大而后趨于穩(wěn)定,其退偏比先增大后減小而后趨于穩(wěn)定。煤煙粒子的雷達(dá)比和退偏比基本不受軸比影響,二者均隨波長(zhǎng)增加而減小。水溶型氣溶膠的雷達(dá)比隨軸比增大小幅度增大,退偏比隨軸比增大先增大后趨于穩(wěn)定,雷達(dá)比和退偏比均隨波長(zhǎng)增加而減小。不可溶型氣溶膠個(gè)波長(zhǎng)波長(zhǎng)下的雷達(dá)比和退偏比基本一致,雷達(dá)比隨軸比增大而增大,退偏比與軸比間的變化規(guī)律不明顯。最后,研究了氣溶膠組分對(duì)大陸型和沙漠氣溶膠雷達(dá)比和退偏比的影響,利用皮爾遜相關(guān)系數(shù)分析了雷達(dá)比和退偏比間的相關(guān)性,并采用數(shù)據(jù)擬合建立了二者的相關(guān)性模型、研研結(jié)果表明大陸型氣溶膠的雷達(dá)比和退偏比負(fù)相關(guān),二次多項(xiàng)式擬合模型可精細(xì)描述二者的相關(guān)性。沙漠氣溶膠的雷達(dá)比和退偏比呈負(fù)相關(guān),線性擬合模型可以精細(xì)描述二者的相關(guān)性。
[Abstract]:Lidar is a powerful tool for detecting the characteristics of atmospheric aerosol light scattering. Radar ratio and depolarization ratio are two important parameters in detecting aerosol by lidar. There is a certain correlation between the two parameters. At present, however, most of the studies on radar ratio and depolarization ratio are independent and lack of necessary crossover, which limits the in-depth study of the scattering characteristics of aerosol light. In this paper, the light scattering characteristics of non-spherical aerosol particles are studied by using the discrete dipole approximation method. The correlation between radar ratio and depolarization ratio is obtained by correlation analysis and data fitting. The results are of great significance for fine classification of aerosols and fine inversion of aerosol optical properties. Firstly, the light scattering characteristics of single-particle non-spherical aerosol particles with different shape, particle orientation and complex refractive index are calculated by using the discrete dipole approximation method, and the effects of each parameter on radar ratio and depolarization ratio are analyzed. On this basis, the influence of axial ratio on the radar ratio and depolarization ratio of population ellipsoidal aerosol is studied. When the axial ratio is increased, the radar ratio of the dust aerosol increases first and then tends to stabilize, and the depolarization ratio increases first and then decreases, then tends to stabilize. The radar ratio and depolarization ratio of soot particles are almost independent of axial ratio, and both of them decrease with the increase of wavelength. The radar ratio of water soluble aerosol increases by a small extent with the increase of axial ratio, and the depolarization ratio increases at first and then tends to stabilize with the increase of axial ratio, while the radar ratio and depolarization ratio decrease with the increase of wavelength. The radar ratio and depolarization ratio of the insoluble aerosol at different wavelengths are basically the same. The radar ratio increases with the increase of the axial ratio, and the variation law between the depolarization ratio and the axis ratio is not obvious. Finally, the effects of aerosol composition on radar ratio and depolarization ratio of continental and desert aerosol are studied. The correlation between radar ratio and depolarization ratio is analyzed by Pearson correlation coefficient, and their correlation models are established by data fitting. The results show that the radar ratio and depolarization ratio of continental aerosol are negatively correlated and the quadratic polynomial fitting model can accurately describe the correlation between them. The radar ratio and depolarization ratio of desert aerosol are negatively correlated, and the linear fitting model can describe the correlation between them.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X831;TN958.98

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