EESS talk on "Understanding the light absorption of atmospheric organic aerosol"
Event details
| Date | 25.02.2025 |
| Hour | 12:15 › 13:15 |
| Speaker | Prof. Michihiro Mochida, Institute for Space-Earth Environmental Research |
| Location | Online |
| Category | Conferences - Seminars |
| Event Language | English |
Abstract:
The organic component in atmospheric particulate matter, called organic aerosol, is characterized by a variety of sources and formation pathways, highly complex composition, and chemical transformation during atmospheric transport. For this reason, explaining its behavior and roles in the atmosphere remains as a challenge. The light absorption by organic aerosol is among unresolved subjects: it is related to the radiative balance and photochemistry in the atmosphere, yet the property itself and the factors governing it is not characterized well. Our research group has been analyzing the light absorption property of organic aerosols by collecting aerosol samples on filters, fractionating organic components based on solvent and solid-phase extractions, and measuring their light absorption. The key technique to investigate the factors governing the light absorption property is the use of an aerosol mass spectrometer, which has been widely used for in-situ aerosol observations, for re-aerosolized samples from laboratory-prepared extracts. Based on the analysis of the chemical structure for the extracted organic fractions and further the source apportionment using their mass spectra, we aim to clarify the relationship between the sources, chemical structure, and light absorption property of organic aerosols. Findings from our studies based on the fractionation approach will be presented and discussed in the seminar.
Biography:
Dr. Michihiro Mochida is a Professor of Institute for Space-Earth Environmental Research, Nagoya University. His current roles include the Director of Center for International Collaborative Research in the institute, and a member of international Commission on Atmospheric Chemistry and Global Pollution (iCACGP). One of his main research interests is the characterization of the physico-chemical properties of atmospheric aerosols that are related to climatic processes. He has been exploring the relationship of the properties with chemical structure and sources for organic aerosol by field- and laboratory-based approaches.
The organic component in atmospheric particulate matter, called organic aerosol, is characterized by a variety of sources and formation pathways, highly complex composition, and chemical transformation during atmospheric transport. For this reason, explaining its behavior and roles in the atmosphere remains as a challenge. The light absorption by organic aerosol is among unresolved subjects: it is related to the radiative balance and photochemistry in the atmosphere, yet the property itself and the factors governing it is not characterized well. Our research group has been analyzing the light absorption property of organic aerosols by collecting aerosol samples on filters, fractionating organic components based on solvent and solid-phase extractions, and measuring their light absorption. The key technique to investigate the factors governing the light absorption property is the use of an aerosol mass spectrometer, which has been widely used for in-situ aerosol observations, for re-aerosolized samples from laboratory-prepared extracts. Based on the analysis of the chemical structure for the extracted organic fractions and further the source apportionment using their mass spectra, we aim to clarify the relationship between the sources, chemical structure, and light absorption property of organic aerosols. Findings from our studies based on the fractionation approach will be presented and discussed in the seminar.
Biography:
Dr. Michihiro Mochida is a Professor of Institute for Space-Earth Environmental Research, Nagoya University. His current roles include the Director of Center for International Collaborative Research in the institute, and a member of international Commission on Atmospheric Chemistry and Global Pollution (iCACGP). One of his main research interests is the characterization of the physico-chemical properties of atmospheric aerosols that are related to climatic processes. He has been exploring the relationship of the properties with chemical structure and sources for organic aerosol by field- and laboratory-based approaches.
Practical information
- General public
- Free
Organizer
- EESS - IIE
Contact
- Prof. Satoshi Takahama, LAPI