目前研究氣膠是一件重要的課題，因為氣膠會影響傳輸至地面的太陽輻射、空氣品質、能見度以及氣候，由氣膠的含量可以評估影響的程度，但是氣膠含量隨時間和空間變化很大，所以使用衛星資料提供大範圍的資訊，進行反演氣膠光學厚度，但是反演時通常需要地表反射率的資料才可以求解，因此本研究將使用多觀測角度及多光譜的MISR衛星資料，以輻射傳送方程為基礎，同時反演氣膠光學厚度和地表反射率。 本研究使用2006 ~ 2008 EPA_NCU和2001 ~ 2009 Beijing AERONET測站資料及其MISR衛星資料，進行反演方法之建立。以太陽天頂角得到線性參數線性化輻射傳送方程式，配合由紅外波段顯反射率得到的不同衛星觀測角之間地表反射率的比值以及由太陽天頂角推求得到的不同衛星觀測角之間背向散射係數的比值，藉由最小二乘法之求解，可以得到的地表反射率和H值(大氣光學厚度和背向散射系數的乘積)，最後根據大氣光學厚度和背向散射係數的關係，便可計算氣膠光學厚度。 由AERONET觀測資料和MISR地表反射率產品之驗證結果顯示，本研究反演的地表反射率和氣膠光學厚度的誤差分別約8 %和30 %，相較於MISR氣膠產品約38 %的誤差，具有較佳的反演結果，此外，本研究所提供的反演方法亦可同時反演地表反射率和氣膠光學厚度。Presently aerosol study is an important issue, because it can influence solar radiation which radiates earth, air quality, visibility and climate. It can evaluate degree of impact from aerosol content. But aerosol will change with time and space, using satellite wild range data is good for retrieve aerosol optical thickness which need surface reflectance information. This study will establish a retrieved method to simultaneously retrieve surface reflectance and aerosol optical thickness by using radiation transfer equation and MISR multi-band and multi-angle satellite data. Analyzing 2006 ~ 2008 EPA_NCU and 2001 ~ 2009 Beijing AERONET data and MISR satellite data indicate that utilize solar zenith angle to linearize radiation transfer equation and take into account characteristics of surface reflectance and backscattering coefficient at different viewing angle can retrieve surface reflectance and H value which is product of atmosphere optical thickness and backscattering coefficient by least squares method. Then aerosol optical thickness (AOT) can be solved by relation of atmosphere optical thickness and backscattering coefficient. The verification results show that the error of retrieved surface reflectance and AOT is 8 % and 30 % respectively and the error of MISR aerosol product is 38 %. Therefore, the retrieval method mentioned in this study can simultaneously provide accurate AOT and surface reflectance.
