2014-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681157摘要：氣膠在大氣系統中具有重要的影響性，氣膠透過太陽輻射的吸收與散射過程改變地球輻射收支平衡以及大氣氣溫，氣膠亦透過影響成雲過程改變雲的反射率。在大氣中，氣膠可地表直接產生，例如沙塵及海鹽；或間接經由光化學氧化作用，得到從氣態物質轉換而來的粒子，稱為二次氣膠。這種間接途徑可以讓人為和自然源的氣體前驅物經由成核和凝結過程產生二次氣膠。二次氣膠通常具有以較小的粒徑，因此在大氣中的存在時間會較長。多數的成核通常被觀察發生在早上，其決定條件為明顯的微小奈米數量增加及成長，但詳細機制仍未被完全了解。為了理解成核機制所需的環境參數及其對氣候和人類健康的影響，本研究計劃將持續去年的進展，探討以下三個主題：（1）在三個不同環境站監測的新粒子的形成與其成核時的氣相組成和環境參數，（2）實驗室中利用流量管研究氣相組成經由光化氧化反應的成核效應，和（3）量測新粒子的光學特性，及其形成雲凝結核的能力。<br> Abstract: Aerosol particles play an important role in climate due to their efficacy in absorbing and scattering solar radiation and their ability to act as cloud condensation nuclei, further affecting the cloud albedo. In the atmosphere, aerosol particles are emitted both directly from the surface of the Earth, such as dust and sea salt particles, and indirectly by oxidation reactions of volatile species that can produce less-volatile products. This indirect pathway can include nucleation and condensation processes, leading to the production of secondary aerosol, with precursors contributed both via anthropogenic and natural sources. The secondary aerosol usually has longer lifetime in the atmosphere due to the smaller size. Many field measurements observe the possible nucleation event which usually happens in the morning. The signature of nucleation events is based on the significant increased population and growth of nanoparticles but the detail mechanism is still under investigation. In order to understand the required parameters for the nucleation events and their impacts on the climate and human health, this study will continue the work from last year to investigate the following three sub-projects: (1) monitor the new particle formation with detail environment parameters such as the gas phase composition for three different environmental sites (2) investigate the new particle formation in a flow tube with controlled radiation and gas phase composition and (3) characterize the optical properties and the ability to form cloud condensation nuclei of nanometer-scaled aerosol particles.氣膠核化奈米粒子aerosolnucleationnanoparticles