對流層氣膠光學性質之研究; The optical properties measurements of tropospheric Aerosols

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题名:	對流層氣膠光學性質之研究;The optical properties measurements of tropospheric Aerosols
作者:	江智偉;Chih-Wei Chiang
贡献者:	物理研究所
关键词:	雷射雷達;氣膠;沙塵;生質燃燒;LIDAR;Aerosols;Dust;Biomass burning
日期:	2005-05-31
上传时间:	2009-09-22 10:53:40 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本論文利用實驗室開發的雙波長、偏振與Raman雷射雷達(LIDAR)遙測中壢地區1-5公里夜間氣膠的光學性質、來源、傳送過程、季節變化和水汽等關係，並配合其它觀測儀器和理論模式如太陽光度計(Sun-Photometer)、探空儀(Radiosonde)、能見度儀(Visibility)、衛星影像(TOMS)和逆軌跡(HYSPLIT)等進行分析討論。全部的分析資料為2002/2至2004/5月間，126天背景氣膠資料和40天特殊事件(沙塵和生質燃燒)氣膠資料。發現對流層背景氣膠主要分佈於3公里以下，並有季節性變化。1-5公里間光學厚度的最大值與最小值分別出現於春季和秋季。偏振雷射雷達配合逆軌跡可區分不同來源氣膠的光學性質與分佈高度。沙塵粒子有較大的平均消偏振比值，主要分佈於0.12?0.27。雙波長雷射雷達可用來測量粒徑大小的高度分佈。利用Raman雷射雷達測量水汽的結果除了與探空水汽資料吻合外，對於研究氣膠與水汽間的交互作用上具有相當的潛力。 Dual-wavelength, depolarization, and Raman Lidar observations for the tropospheric aerosols in the height region 1-5 km, using data of 126 days for background aerosols and 40 days for special aerosols events (dust and biomass burning) during the period 2002/2-2004/5, are presented in this paper. Lidar measurements revealed the optical properties, source, transport processes, seasonal variation, and humidity effect of aerosols. Data were analyzed in conjunction with Sun-photometer, Radiosonde, Visibility, satellite image (TOMS), and trajectory studies (HYSPLIT). The larger aerosols loading occurred below 3 km and had a distinct feature of seasonal variation. The maximum and minimum aerosol optical thickness, in the height region of 1-5 km, for the spring and fall seasons respectively. There are different characteristics for various aerosols which are recognized by using depolarization Lidar. The dust aerosols events have larger depolarization ratio varied mainly between 0.12 and 0.27. The height distribution of the particles size derived from the dual-wavelength Lidar. Raman Lidar measured the results of humidity were not only coincidence with Radiosonde but also had the potential to understand the interaction of aerosols and humidity.
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