Turbulent Aerosol Fluxes in the central Arctic during the ARTofMELT expedition

平均而言，北极中部地区变暖的速度比世界其他地区或全球平均要快得多。温暖和潮湿的气团周期性地输送到北极地区，即所谓的大气河流，有助于北极表面变暖，也影响春季海冰融化季节的开始及其对气溶胶和云特性的反馈。在这个项目中，将在瑞典研究破冰船Oden号上测量2023年ARTofMELT考察期间北冰洋中部的垂直湍流气溶胶颗粒通量，以调查这些通量在不同地表条件和气象条件下的变化。ARTofMELT的重点将是温暖和潮湿的气团侵入对海冰融化动力学的影响，以及海冰、云、气溶胶颗粒和大气辐射收支之间的相关相互作用和反馈过程。将使用三种不同的方法测量北极春季海冰融化前后以及温暖和潮湿气团入侵事件期间的湍流气溶胶通量。涡旋协方差气溶胶通量测量将在破冰船前甲板上的桅杆上进行。开放铅的气溶胶排放将使用浮动小室系统进行估计，通量-梯度关系将使用浮冰上的近地表颗粒浓度分布进行评估。该项目将为欧洲气象局的国际探险和正在进行的由英国气象局资助的研究项目“夏季期间北极中部开放水域和冰上垂直湍流气溶胶颗粒输送--北极海洋边界层中的气溶胶颗粒源和转化”作出贡献。

The central Arctic region is warming much faster than other parts of the world or the globe on average. Episodic transport of warm and moist air masses to the Arctic region, so called Atmospheric Rivers, contribute to Arctic surface warming and also affect the onset of the sea ice melt season in springtime and its feedback to aerosol and cloud properties. In this project, vertical turbulent aerosol particle fluxes will be measured in the central Arctic Ocean during the ARTofMELT expedition 2023 onboard the Swedish research icebreaker Oden in order to investigate how these fluxes vary under different surface conditions and meteorological conditions. A focus of ARTofMELT will be on the impact of warm and moist air mass intrusions on sea ice melt dynamics and the associated interactions and feedback processes between sea ice, clouds, aerosol particles, and the atmospheric radiation budget. Turbulent aerosol fluxes will be measured before and after the onset of sea ice melt in the Arctic spring, and during warm and moist air mass intrusion events using three different approaches. Eddy covariance aerosol flux measurements will be carried out on a mast on the foredeck of the icebreaker. Aerosol emission from open leads will be estimated using a floating chamber system, and flux-gradient relationships will be evaluated using near-surface particle concentration profiles on ice floes. This project will contribute to the international ARTofMELT expedition and to the ongoing DFG-funded research project “Vertical Turbulent Aerosol Particle Transport above open Water and Ice in the central Arctic during Summertime – Aerosol particle sources and transformation in the Arctic marine boundary layer”.