Investigation of key aerosol nucleation mechanisms in the tropical troposphere above the Indo-Pacific during the HALO mission CAFE-Pacific

HALO 任务期间印度太平洋上空热带对流层关键气溶胶成核机制的研究 CAFE-Pacific

• 批准号: 502266535
• 负责人: Professor Dr. Joachim Curtius
• 金额: --
• 依托单位: Institut für Atmosphäre und Umwelt (IAU)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/502266535?language=en
• 关键词: Investigation; key; aerosol; nucleation; mechanisms

This project aims at the investigation of aerosol formation in the tropical upper troposphere above the Indo-Pacific. The chemical species that are responsible for aerosol nucleation and growth of aerosol particles in the tropical upper troposphere have not yet been identified. A central goal of the CAFE-Pacific mission with the research aircraft HALO will be to investigate the nucleation processes that occur in the upper tropical troposphere and, in particular, to identify and quantify the substances responsible for nucleation for the first time. With the help of the chemical ionization mass spectrometer used in this project, substances of very low volatility such as sulfuric acid, methanesulfonic acid and highly oxidized organic compounds can be measured. The photochemkeyical oxidation processes that take place in the outflow of deep convection are investigated, for example the conversion of dimethyl sulfite into sulfur dioxide, sulfuric acid and methanesulfonic acid. The elucidation of the oxidation and nucleation processes makes it possible to assess the role of aerosol nucleation in the tropical upper troposphere as the source region for both the formation of cloud condensation nuclei that supply the tropical troposphere as well as the stratospheric aerosol layer.

该项目旨在调查印度-太平洋上空热带对流层上层的气溶胶形成。对热带对流层上部气溶胶粒子的成核和生长负责的化学物种尚未确定。CAFE-太平洋飞行任务与研究飞机Halo的一个中心目标将是调查热带对流层上层发生的成核过程，特别是首次确定和量化造成成核的物质。借助本项目中使用的化学电离质谱仪，可以测量极低挥发性的物质，如硫酸、甲烷磺酸和高度氧化的有机化合物。研究了在深对流流出流下发生的光化学氧化过程，例如二甲基亚硫酸盐转化为二氧化硫、硫酸和甲烷磺酸。氧化和成核过程的阐明使评估热带对流层上层气溶胶成核的作用成为热带对流层和平流层气溶胶层云凝结核形成的源区。