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SUMMARY:EESS talk on "Understanding the light absorption of atmospheric or
 ganic aerosol"
DTSTART:20250225T121500
DTEND:20250225T131500
DTSTAMP:20260525T190809Z
UID:9461be1aa42209006c2edbe97611059b828b456fbe8fbee18a08439d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Michihiro Mochida​​​​​​​\, Institute for 
 Space-Earth Environmental Research\nAbstract:\nThe organic component in at
 mospheric particulate matter\, called organic aerosol\, is characterized b
 y a variety of sources and formation pathways\, highly complex composition
 \, and chemical transformation during atmospheric transport. For this reas
 on\, explaining its behavior and roles in the atmosphere remains as a chal
 lenge. The light absorption by organic aerosol is among unresolved subject
 s: it is related to the radiative balance and photochemistry in the atmosp
 here\, yet the property itself and the factors governing it is not charact
 erized well. Our research group has been analyzing the light absorption pr
 operty of organic aerosols by collecting aerosol samples on filters\, frac
 tionating organic components based on solvent and solid-phase extractions\
 , and measuring their light absorption. The key technique to investigate t
 he factors governing the light absorption property is the use of an aeroso
 l mass spectrometer\, which has been widely used for in-situ aerosol obser
 vations\, for re-aerosolized samples from laboratory-prepared extracts. Ba
 sed on the analysis of the chemical structure for the extracted organic fr
 actions 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 stu
 dies based on the fractionation approach will be presented and discussed i
 n the seminar.\n\n\nBiography:\nDr. Michihiro Mochida is a Professor of In
 stitute for Space-Earth Environmental Research\, Nagoya University. His cu
 rrent roles include the Director of Center for International Collaborative
  Research in the institute\, and a member of international Commission on A
 tmospheric Chemistry and Global Pollution (iCACGP). One of his main resear
 ch 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 s
 ources for organic aerosol by field- and laboratory-based approaches.\n\n\
 n 
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/69011077410
STATUS:CONFIRMED
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