摘要
大氣中之粗微粒乾沈降模式已經過乾沈降之資料予以評估，同時採樣時並以乾沈降板於其上下表面來收集乾沈降之資料。而大氣中粗微粒濃度則以XOLL旋轉衝器來量測，至於金屬方面則以原子吸收光譜儀配合石墨爐來分析，以粗微粒來計算乾沈降結果顯示真正之乾沈值能預估，並且其預測結果對於越大顆粒之微位其乾沈降值增加的十分明顯。同時此號結果顯示大氣中大於10um之粗微粒決定了大氣中超過90%之乾沈降速度所致。粗微粒模式高估了鉛、銅、鋅、鎘等元素之向上的乾沈降值，而低估了鋅、鎘等元素之向下的乾沈降值。對於錳、鋅等元素而言，不論是向上或向下之的乾沈降，此模式均高估了此值。
關鍵字
無資料並列摘要
Atmospheric coarse particles model has been evaluated by the dry deposition flux data collected simultaneously on the top and bottom surfaces of a smooth plate with a sharp leading edge that was pointed into the wind by a wind vane. The airborne concentration of coarse particles was measured with a Noll Rotary Impactor. Metals were analyzed by atomic absorption spectrophotometer together with graphite furnace device. Calculation using coarse particle model shown realistic estimates can be made for the total dry deposition flux and results are extremely sensitive to the mass of large particles. The results in this paper demonstrate that coarse particles dry deposition flux is responsible for greater than 90% of the modeled flux for particle size greater than 10 μm. Large particles control dry deposition flux is due to their high deposition velocities. Coarse particles dry deposition model over predicts elements (Pb, Cu Zn, Cd,) in upward fluxes and underestimate elements (Zn and Cd) in downward fluxes. For elements Mn and Fe, this model is overestimate in both upward and downward fluxes.
延伸閱讀
- 楊意驊（2015）。顆粒形狀對顆粒體在旋轉鼓內流動行為之影響〔碩士論文，國立中央大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0031-0412201512084878
- 黃子瑄（2022）。微粒在纖維性濾材上再揚起之特性研究〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU202201968
- 王建智（2018）。顆粒接觸行為之量測〔博士論文，國立交通大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0030-0205201911240912
- 藍政英（2008）。顆粒材料之微連續體分析〔博士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2008.02250
- Hwang, K. J., & Wang, Y. S. (2003). 軟質多孔性次微米粒子之掃流微過濾. Journal of the Chinese Institute of Chemical Engineers, 34(1), 161-169. https://doi.org/10.6967/JCICE.200301.0161