本文關(guān)鍵詞：典型地區(qū)大氣氣溶膠譜分布和折射率特征研究　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大氣氣溶膠 Mie散射理論 氣溶膠譜分布 折射率 對數(shù)正態(tài)分布

【摘要】：大氣氣溶膠由于其復(fù)雜的影響機(jī)制和在氣候中的重要作用,已成為目前的研究熱點(diǎn)之一。大氣氣溶膠粒子譜分布和復(fù)折射率m(m=nr-ini,nr是折射率實(shí)部,ni是折射率虛部)是氣溶膠的重要物理參量,特別是其復(fù)折射率是模擬氣溶膠輻射效應(yīng)必須知道的物理參量。我國疆域遼闊,地形與氣候復(fù)雜多樣,不同區(qū)域氣溶膠源差異很大,因此研究典型地區(qū)氣溶膠的光學(xué)參數(shù)特征尤其是氣溶膠復(fù)折射率特征是很有意義的。本文利用Mie散射理論結(jié)合OPC-06光學(xué)粒子計(jì)數(shù)器、黑碳儀、積分濁度儀和能見度儀等儀器近地面測量的氣溶膠微物理和光學(xué)特性,反演出新疆、天津、廈門和合肥四個(gè)典型地區(qū)的大氣氣溶膠復(fù)折射率,并分析了這四個(gè)典型地區(qū)的吸收和散射系數(shù)以及氣溶膠粒子數(shù)濃度譜分布。此外本文還重點(diǎn)利用OPC-06光學(xué)粒子計(jì)數(shù)器測量出的氣溶膠粒子數(shù)濃度譜,利用對數(shù)正態(tài)分布擬合城市型、鄉(xiāng)村型、沙漠型和海洋型四種類型氣溶膠粒子的數(shù)濃度譜分布。主要結(jié)論如下:(1)天津地區(qū)、廈門地區(qū)和合肥地區(qū)的氣溶膠譜分布由Junge分布和對數(shù)正態(tài)分布共同描述,其中間模態(tài)均為對數(shù)正態(tài)分布,峰值中心分別在0.80、0.86和0.54 μm,符合城市氣溶膠的特征;而新疆地區(qū)的氣溶膠譜分布則由Junge分布來描述。(2)新疆地區(qū)、天津地區(qū)、廈門地區(qū)及合肥地區(qū)的大氣氣溶膠折射率實(shí)部nr都在1.50左右,折射率虛部ni分別為0.010、0.017、0.008和0.016。(3)天津地區(qū)、合肥地區(qū)和廈門地區(qū)的消光系數(shù)和吸收系數(shù)隨波長的變化趨勢一致,在長波波段幾乎不變化;在新疆地區(qū),短波波段消光作用明顯,而在長波波段則是吸收作用明顯。(4)城市型氣溶膠、鄉(xiāng)村型氣溶膠、沙漠型氣溶膠和海洋型氣溶膠的數(shù)濃度譜分布基本上都上由三段對數(shù)正態(tài)分布擬合疊加而成。城市型氣溶膠中間模的模半徑在1μm附近。鄉(xiāng)村型氣溶膠和沙漠氣溶膠則主要有兩個(gè)細(xì)粒模,其中鄉(xiāng)村型氣溶膠的粒子濃度較低。海洋型氣溶膠的中間模的半徑同樣在1μm附近,不過主要是由于海鹽飛沫。太平洋海域沒有粗粒模,沙漠型氣溶膠夏季時(shí)粗粒模的濃度最大。
[Abstract]:Atmospheric aerosol has become one of the research hotspots in recent years because of its complex influence mechanism and important role in climate. Atmospheric aerosol particle spectrum distribution and complex refractive index mnr-ini have become one of the hotspots. Nr is an important physical parameter of aerosol, especially its complex refractive index is the physical parameter which must be known to simulate aerosol radiation effect. Our country has a vast territory. The topography and climate are complex and diverse, and the aerosol sources vary greatly in different regions. Therefore, it is significant to study the characteristics of aerosol optical parameters, especially the complex refractive index of aerosols in typical areas. In this paper, we use Mie scattering theory combined with OPC-06 optical particle counter, black carbon meter. The microphysical and optical properties of aerosol measured near the ground by means of integrated turbidimeter and visibility instrument are used to reverse the atmospheric aerosol complex refractive index in four typical regions of Xinjiang, Tianjin, Xiamen and Hefei. The absorption and scattering coefficients of the four typical regions and the distribution of aerosol particle number concentration spectrum are analyzed. In addition, the aerosol particle number concentration spectrum measured by OPC-06 optical particle counter is also emphasized in this paper. The distribution of the number concentration spectrum of aerosol particles of urban, rural, desert and marine types is fitted by logarithmic normal distribution. The main conclusions are as follows: 1) Tianjin. The aerosol spectrum distribution in Xiamen area and Hefei area is described by Junge distribution and logarithmic normal distribution. The intermediate modes are lognormal distribution and the peak value center is 0.80. 0.86 渭 m and 0.54 渭 m, which accord with the characteristics of urban aerosol. The aerosol spectrum distribution in Xinjiang is described by Junge distribution.) in Xinjiang, Tianjin, Xiamen and Hefei, the real atmospheric aerosol refractive index (nr) is about 1.50. The imaginary part of refractive index is 0.010 0. 017 0. 008 and 0. 016. 3 respectively) in Tianjin area. The change trend of extinction coefficient and absorption coefficient with wavelength is the same in Hefei region and Xiamen area, but almost no change in long wave band. In Xinjiang region, the short-wave band extinction effect is obvious, but in the long-wave band is the absorption effect is obvious. 4) the city type aerosol, the countryside type aerosol. The distribution of numerical concentration spectrum of desert aerosol and marine aerosol is basically superposed by three-stage logarithmic normal distribution. The model radius of the intermediate model of urban aerosol is about 1 渭 m. Aerosols mainly have two fine-grained models. The radius of the intermediate model of marine aerosol is also around 1 渭 m, but mainly due to sea salt droplets. There is no coarse grain model in the Pacific Ocean. In summer, the concentration of coarse model is the highest in desert aerosol.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X513

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