1:45 PM - 2:00 PM
[ACG54-01] Airborne observation during the ASIA-AQ 2024 campaign and individual particle measurements
Keywords:aerosol, Airborne observation, Asia, individual particle measurements
This presentation will provide an overview of the ASIA-AQ 2024 campaign, an airborne observation campaign conducted in Asian countries. It will also show the results of individual particle analysis. Asia is known as a major source of atmospheric pollutants on a global scale due to its high population density and frequent forest and agricultural fires. However, there is a large gap in the air pollutant monitoring system among countries. Therefore, in this campaign, we aimed to understand the current atmospheric pollutants, including aerosols and gases, in East and Southeast Asian countries through cooperation between aircraft observations equipped with various instruments and ground observations by local research groups. We also aimed to establish an observation network for the region based on satellite observations and models.
The ASIA-AQ campaign was conducted from February 1 to March 30, 2024, under the leadership of NASA, USA. Observations for the ASIA-AQ campaign were conducted in the Philippines, Korea, Thailand, and Taiwan. The aircraft used were NASA DC8 and NASA Gulfstream III, in addition to four Korean aircrafts operated by Korean Universities and the research institutes. During the observation period, ground-based observations, modelling analyses, and satellite observations were also synchronized in each country to observe and analyze their air pollutants at various temporal and spatial scales. During the campaign, we observed a significant air pollution event in Thailand caused by forest and agricultural fires. In South Korea, there were many clean periods during most of the observation period, whereas some long-range transport events were observed at high altitude over the Yellow Sea. Other countries also showed various local and long-range transport events.
In this study, an aerosol sampler for electron microscopy was mounted on NASA DC8 to collect aerosol particles during polluted air mass event with different altitudes. The samples were then analyzed by transmission electron microscopy (TEM) to analyze the composition and mixing state of the aerosol particles. In this presentation, preliminary results of the TEM analysis will be presented. The main TEM results include the classification of aerosols based on compositional analysis (dust, sea salt, potassium salt, sulfate, carbonaceous aerosols, etc.) and their number fraction at various region and particle sizes, the mixing state of black carbon, the characteristics of tarball particles, and the presence of metal-bearing particles (e.g. zinc and lead). This study will characterize these aerosol particles at an individual scale at different air masses, altitudes, and regions.
The ASIA-AQ campaign was conducted from February 1 to March 30, 2024, under the leadership of NASA, USA. Observations for the ASIA-AQ campaign were conducted in the Philippines, Korea, Thailand, and Taiwan. The aircraft used were NASA DC8 and NASA Gulfstream III, in addition to four Korean aircrafts operated by Korean Universities and the research institutes. During the observation period, ground-based observations, modelling analyses, and satellite observations were also synchronized in each country to observe and analyze their air pollutants at various temporal and spatial scales. During the campaign, we observed a significant air pollution event in Thailand caused by forest and agricultural fires. In South Korea, there were many clean periods during most of the observation period, whereas some long-range transport events were observed at high altitude over the Yellow Sea. Other countries also showed various local and long-range transport events.
In this study, an aerosol sampler for electron microscopy was mounted on NASA DC8 to collect aerosol particles during polluted air mass event with different altitudes. The samples were then analyzed by transmission electron microscopy (TEM) to analyze the composition and mixing state of the aerosol particles. In this presentation, preliminary results of the TEM analysis will be presented. The main TEM results include the classification of aerosols based on compositional analysis (dust, sea salt, potassium salt, sulfate, carbonaceous aerosols, etc.) and their number fraction at various region and particle sizes, the mixing state of black carbon, the characteristics of tarball particles, and the presence of metal-bearing particles (e.g. zinc and lead). This study will characterize these aerosol particles at an individual scale at different air masses, altitudes, and regions.