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DTSTAMP:20260719T132217Z
UID:https://www.mpic.de/events/28662/3605822
DTSTART:20260708T121500Z
CLASS:PUBLIC
CREATED:20210701T134802Z
DESCRIPTION:Brown carbon (BrC) — the light-absorbing fraction of organic 
 aerosol — is often treated as a fixed property\, but its optical and hea
 lth-relevant behaviour depends strongly on what is measured and how the sa
 mple is taken. This talk makes that case from two datasets.For optics\, re
 al-time and filter measurements of the same winter BrC in Seoul give oppos
 ite source rankings\, because BrC absorption evolves through the day and e
 ach method sees a different part of it — a measurement-window effect rat
 her than a property of the atmosphere. For health\, combustion particles s
 how that BrC also shapes oxidative-potential assessment: in brown\, methox
 yphenol-rich samples the hydroxyl-radical (•OH) signal is lowered\, cons
 istent with phenolic •OH scavenging. Crucially\, a lower •OH signal do
 es not mean the particle is harmless — in cells\, BrC-poor combustion PM
  is the most cytotoxic\, the opposite ranking\, so the endpoint decides th
 e verdict.Taken together\, brown carbon matters for both climate and healt
 h\, and in both domains the conclusion depends on measurement choices — 
 timescale\, method\, assay and endpoint.\nVortragende(r): Hwajin Kim
LAST-MODIFIED:20260703T112506Z
LOCATION:Max Planck Institute for Chemistry\, Raum: Seminar rooms 2/3
ORGANIZER;CN=T. Berkemeier:mailto:
SUMMARY:Institute Seminar: Brown carbon: why measurement matters<i>. </i><i
 >Optical and oxidative-potential impacts in urban and combustion aerosols<
 /i>
URL;VALUE=URI:https://www.mpic.de/events/28662/3605822
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