EAGER: Accurate Aerosol Sampling and Size Distribution Measurements Inside and Outside Cloud Systems During ICE-T

该项目将在Ice - t（热带云中冰实验）现场活动期间，使用一种新型改进的气溶胶-云采样器，并将其与新开发的快速迁移光谱仪和扫描云凝结核（CCN）仪器相结合，准确地表征飞机上的气溶胶颗粒。具体目标是：1)考虑到可能存在毛毛雨、冰和降水，使用克拉克森间隙入口（CII）对云内外的气溶胶粒子进行精确采样。2)使用clarkson开发的新型快速气溶胶迁移谱仪在不到20秒的时间内确定小于300 nm的颗粒的大小分布。3)使用快速DMA系统和快速CCN仪器的组合确定采样气溶胶的大小分类CCN分数。知识价值：该项目解决了提高我们对大气中冰成核过程理解的需要。云系统内外气溶胶颗粒的尺寸分布测量将提供有关参与云形成的颗粒尺寸分数的关键信息。此外，颗粒的混合性质将由尺寸分类的CCN测量来确定。本研究的智力价值包括：1)开发和性能验证了一种新的间隙气溶胶采样器，该采样器将提供对云系统中非活化气溶胶颗粒进行采样和分析的关键能力。2)测量暖相和混合相云中粒径分布和粒径分类CCN，从而获得验证现有气溶胶-云参数化的重要数据，并提高我们对冰核形成的理解。更广泛的影响：这项工作将导致(i)开发一种新的气溶胶-云采样器，可用于各种飞机平台的气溶胶-云系统表征，以及（ii）验证快速测定颗粒仪器的性能，该仪器将提供接近实时的大气气溶胶尺寸分辨率测量。作为这个项目的一部分，两名研究生将参与其中。两位研究生都将接触到基于飞机的测量和科学数据分析。此外，通过参加实地活动，学生们将有机会与知名的大气科学家互动，促进他们作为独立研究人员的发展。

The project will accurately characterize aerosol particles from aircrafts using a new and improved aerosol-cloud sampler and integrating it with a newly developed fast mobility spectrometer and a scanning cloud condensation nuclei (CCN) instrument during the ICE-T (Ice in Clouds Experiment-Tropical) field campaign. The specific objectives are:1) Accurate sampling of aerosol particles outside and inside clouds considering the possible presence of drizzle, ice, and precipitation using the Clarkson Interstitial Inlet (CII).2) Determine the size distribution of particles smaller than 300 nm in less than 20 seconds using the new fast aerosol mobility spectrometer developed at Clarkson.3) Determine the size-classified CCN fraction of the sampled aerosol using a combination of a fast DMA system and a fast CCN instrument.Intellectual merit:This project addresses the need to improve our understanding of ice nucleation process in the atmosphere. Size distribution measurements of aerosol particles inside and outside of cloud systems will provide critical information about the particle size fractions that are participating in cloud formation. In addition, the mixing nature of the particles will be determined from size-classified CCN measurements. The intellectual merit of this study includes:1) The development and performance validation of a new interstitial aerosol sampler that will provide a critical ability to sample and analyze non-activated aerosol particles in cloud systems.2) Measurements of particle size distributions and size-classified CCN in warm and mixed-phase clouds, resulting in obtaining important data to test existing aerosol-cloud parameterizations and improving our understanding of formation of ice nuclei.Broader Impacts:This work will result in (i) the development of a new aerosol-cloud sampler that can be used for aerosol-cloud system characterization from a wide-range of aircraft platforms, and (ii) validating the performance of a fast sizing particle instrument that will provide near real-time size-resolved measurements of atmospheric aerosol.As a part of this project, two graduate students will be involved. Both graduate students will gain exposure to aircraft-based measurements and in analysis of scientific data. Also, by participating in a field campaign, the students will get an opportunity to interact with established atmospheric scientists, furthering their development as independent researchers.