Biogenic Organic Aerosol Experiment in Amazonia

在雨季，亚马逊雨林是一个很大程度上未受干扰的系统，相对于形成的积累模式生物气溶胶。 本研究将进一步描述天然二次有机气溶胶（SOA）在原始环境中的形成、过程和成云特性。 由植物排放物的光反应引起的（例如，异戊二烯，单萜）和大气氧化剂，尺寸分辨的颗粒物演变成更大的SOA，云凝结核（CCN）可能作为一个机械的生物过程和气候之间的联系，通过降水模式的控制。实地调查将利用现有的森林研究地点，亚马逊大规模生物圈-大气实验（LBA）塔网站位于马瑙斯以北60公里处，马瑙斯是一个约200万人口的城市，也是巴西亚马逊州的首府。 主要的实验策略将集中在部署一个高（质量）分辨率的飞行时间气溶胶质谱仪（HR ToF-AMS），这将使大气质量负荷，质谱（化学鉴定）和空气动力学尺寸分布（35 nm至1.5 μ m）的SOA颗粒在高时间分辨率观察。

During the wet season, the Amazon rainforest is a largely unperturbed system with respect to the formation of accumulation mode biogenic aerosols. This study will further describe the formation, processing and cloud forming properties of natural secondary organic aerosols (SOA) in a pristine setting. Arising from the photoreaction of vegetative emissions (e.g., isoprene, monoterpenes) and atmospheric oxidants, the size resolved particulate evolution of SOA into larger, cloud condensation nuclei (CCN) potentially serves as a mechanistic link between biological processes and climate through resulting control of precipitation patterns. Field investigations will take advantage of an existing forest research site, the Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) tower site located 60km north of Manaus, a city of approximately 2 million and the capital of Amazonas state, Brazil. The prime experimental strategy will concentrate on the deployment of a high (mass) resolution time-of-flight aerosol mass spectrometer (HR ToF-AMS) which will allow the atmospheric mass loading, the mass spectra (chemical identification) and the aerodynamic size distribution (35nm to 1.5um) of SOA particles to be observed at high temporal resolution.