Composition analysis of ice particle residuals combining aerosol mass spectrometry and counterflow virtualimpactor technique

INUIT（冰核研究单位）正在进行的研究项目的更新建议旨在对环境冰成核颗粒（INP）和冰颗粒残留物（IPR）进行物理化学表征。两个主要的实验技术将部署：逆流虚拟撞击器（CVI）技术和激光烧蚀气溶胶质谱。环境气溶胶中的INP将被IN计数器激活，冰晶将被INUIT第一阶段开发的泵送CVI系统提取和蒸发。释放的IN粒子将通过气溶胶质谱仪进行分析。该实验将在接近潜在冰成核颗粒源（矿物粉尘、生物颗粒、人为污染颗粒）的实地活动期间进行。一个合适的地点是地中海地区，例如西班牙南部。IPR将通过专门设计的Ice-CVI从混合相云中直接取样，该Ice-CVI仅提取冰晶并拒绝过冷液滴。冰在干燥的逆流中蒸发，残留的颗粒将通过气溶胶质谱仪进行分析。这项实验将在一个山区站（少女峰）进行。IN计数器、泵送CVI和气溶胶质谱仪的组合也将在实验室条件下应用于外部和内部颗粒混合物（例如，生物矿物）。单粒子气溶胶质谱仪也将用于表征实验室产生的粒子混合物的混合状态。

This renewal proposal of an ongoing research project within the research unit INUIT (Ice Nuclei research UnIT) aims for the physico-chemical characterization of ambient ice nucleating particles (INP) and ice particle residuals (IPR). Two major experimental techniques will be deployed: counterflow virtual impactor (CVI) technique and laser ablation aerosol mass spectrometry. INP in ambient aerosol will be activated by an IN counter and the ice crystals will be extracted and evaporated by a pumped CVI system that was developed in the first phase of INUIT. The released IN particles will be analyzed by the aerosol mass spectrometer. This experiment will be carried out during a field campaign in proximity to sources of potential ice nucleating particles (mineral dust, bioparticles, anthropogenic pollution particles). An appropriate location is the Mediterranean region, e.g. southern Spain. IPR will be sampled directly from mixed phase clouds by a specially designed Ice-CVI that extracts only ice crystals and rejects the supercooled droplets. The ice is evaporated in the dry counterflow and the residual particles will be analyzed by the aerosol mass spectrometer. This experiment will be conducted on a mountain station (Jungfraujoch). The combination of IN counter, pumped CVI and aerosol mass spectrometer will also be applied under laboratory conditions for the investigation of the ice nucleation behavior of external and internal particle mixtures (e.g., biologicalmineral). The single particle aeLosol mass spectrometer will also be used for the characterization of the mixing state of the laboratory-generated particle mixtures.