Description (optional)
Emissions of halogenated volatile organic compounds (VOCs) have been increasing from Asia in recent years. Combined with deep convection events fueled by the Asian monsoon, halogenated VOCs have strong potential to impact stratospheric ozone. During the 2022 NSF-funded Asian Summer Monsoon Chemical & CLimate Impact Project (ACCLIP) and the NASA Airborne and Satellite Investigation of Asian Air Quality (ASIA-AQ) missions, our team deployed the NSF NCAR Trace Organic Gas Analyzer with Time-of-Flight mass spectrometer (TOGA-TOF) on board the NSF NCAR Gulfstream V (GV) and the NASA DC-8, respectively, to quantify a large suite VOCs including a many halogenated VOCs in various Asian air masses. The TOGA-TOF is a fast online gas chromatograph/mass spectrometer (GC/MS) with very low detection limits, and excellent precision and accuracy. During these two campaigns, TOGA-TOF observations of dibromomethane (CH2Br2) and bromoform (CHBr3), believed to be primarily emitted from marine sources, were observed at elevated levels and at very different ratios to well-characterized marine emissions and above the typical background ratio suggesting a non-marine and likely anthropogenic source of CH2Br2. In this presentation we will explore the correlations of these high CH2Br2:CHBr3 observations against known anthropogenic emissions in different regions and compare these data against several other recent ground-based and airborne datasets. Non-natural emissions of CH2Br2 have the potential to impact the bromine budget, which could have implications for stratospheric ozone.Estimated # of Participants (if applicable)
700| Period | Sep 8 2026 |
|---|---|
| Event title | iCACGP-IGAC Conference: Atmospheric Chemistry within the Earth System: Understanding changes and impacts |
| Event type | Colloquium |
| Location | Heraklion, GreeceShow on map |
| Degree of Recognition | International |