Identifying the Origins of Summertime Arctic Cloud Condensation Nuclei Using Online Fine Aerosol Composition Measurements

云在北极的辐射收支和气候中起着至关重要的作用，但这些云滴形成的粒子的来源相对未知。 该研究项目将提供一个机会，对北冰洋破冰船上的微观颗粒进行专门测量。 通过了解云粒子的来源，科学家将能够更好地确定在海冰较少的世界中云的条件是否会发生变化，从而改善对世界这一关键地区气候的长期预测。 在研究期间，还将开展教育和宣传活动，包括在研究巡航期间建立在线照片博客。研究小组将调查夏季高纬度北冰洋上空细颗粒气溶胶和云凝结核的来源。 现场测量将于2018年8月至9月在瑞典破冰船奥登号上进行。 热解吸化学电离质谱仪将用于测量环境尺寸分辨的10- 200 nm直径气溶胶的组成，目标是积累，艾特肯和成核模式。 还将使用颗粒进液采样器（PILS）收集环境亚微米气溶胶总量，随后进行离线分析。 该项目的目标是测量生物多糖物质、海盐、其他有机物和其他盐类对北极气溶胶的相对贡献。 一个成功的项目将导致确定哪些过程是造成不同大小的气溶胶的原因，这将导致推断该区域最重要的云凝结核来源的能力。

Clouds play a critical role in the radiation budget and climate of the Arctic, but the origin of the particles on which these cloud droplets form is a relative unknown. This research project will provide an opportunity to take specialized measurements of microscopic particles onboard an ice breaker in the Arctic Ocean. By understanding the sources of cloud particles, scientists will be better able to determine whether cloud conditions will change in a world with less sea ice, and thus improve long-term forecasts of climate in this critical part of the world. Education and outreach activities will also be conducted during the project, including an online photo blog during the research cruise.The research team will investigate the origin of fine particle aerosols and cloud condensation nuclei over the summertime high Arctic Ocean. Field measurements will be taken from the Swedish icebreaker Oden during August-September 2018. The Thermal Desorption Chemical Ionization Mass Spectrometer will be deployed to measure the composition of ambient size-resolved 10-200nm diameter aerosols, targeting the accumulation, Aitken and nucleation modes. Total ambient sub-micron aerosols will also be collected using a Particle into Liquid Sampler (PILS) and subsequently analyzed offline. The goal of the project is to measure the relative contributions to Arctic aerosol of biogenic polysaccharide material, sea salt, other organics, and other salts, on a size-resolved basis. A successful project would result in determining what processes are responsible for aerosols of different sizes, which would lead to the ability to infer the most important CCN sources in the region.