Methane, Ozone & Other Trace Gases

Wednesday, May 10, 2017 -
09:00 to 10:00


-          Presentation: Understanding the Impact of Biomass Burning on Ozone Conditions in the Arctic (McClure) – 20 min

-          Discussion of presentation – 10min

-          CATCH overview (Uttal) – 10 min


IASOA Methane, Ozone/Trace Gases Working Group

May 10, 2017


Attendees: Sara Crepinsek, Irina Petropavlovskikh, Audra McClure, Kristof Bognar, Von Walden, Taneil Uttal, James Hannigan, Kim Strong, Erik Lutsch, Shima Shams


Role Call of group members

Understanding the Impact of Biomass Burning on Ozone Condition in the Arctic presentation by Audra McClure – main question to answer: What is the impact of forest fires and long-range transport of biomass burning species on surface/tropospheric ozone in the Arctic?, brief overview of ozone depletion events and concentrations, focus on tropospheric ozone in the Arctic, literature review of ozone and biomass burning, same fire can have different emissions, biomass burning releases a suite of compounds into the atmosphere, global circulation and climate patterns impact biomass burning and the transport of associated pollutants to the Arctic, complex interactions of pollutants and meteorological conditions which vary between episodes, overview of how episodes are identified, using co-located measurements, satellite imagery, back-trajectory analysis, and models, case study of Barrow Alaska, Summit Greenland, and Tiksi, Russia, helpful to utilize black carbon measurements at same location as surface ozone measurements, co-located measurements of VOC’s, meteorology, aerosols, and model results are essential for determining the impact of biomass burning on ozone conditions, biomass burning episodes are variable in space and time, generalized (monthly) studies are often not sufficient to identify the influence, in the future want to apply the methods defined to investigate long term variation in frequency of biomass burning related high ozone events for each station, spatial analysis including all Arctic ozone measurement sites, since Summit is higher in the troposphere that can cause it to higher ozone values


CATCH overview by Taneil Uttal – The Cryosphere and Atmospheric Chemistry (CATCH) program, emerging IGAC activity on Chemistry, biology, and physics in cold regions, first work shop for CATCH program, strategized how to get group up and running, interested in how IASOA can assist with CATCH (data portal, working groups), 35 presentations total – 10 operating near or at IASOA station and using IASOA station data 4-5 additional presentations with potential for expanding scope with IASOA station data, what is next for CATCH and IASOA: solicit contributions to aerosol WG chemistry inventory (different kind of chemistry?), capture CATCH elements in the IASOA system science figure – identification of small particle production impacts on cloud microphysics for instances (BIOGEOCHEMISTRY), discuss if a CATCH group would want to start a separate activity line in the Trace Gases WG or perhaps CATCH is an example of an IASOA WG partner, a lot of CATCH is related to small particle distribution which will align with IASOA WGs, interesting new fact from CATCH is that frost flowers are no longer considered to be a source of bromine, develop connections of overlap between IASOA ozone/trace gases WG and CATCH focus


Eureka preliminary results from spring 2017 by Kristof Bognar – during spring (March) 2017 campaign captured BrO explosions at the Eureka station, compared these BrO explosions with surface ozone measurements at the station, also investigated particle size distribution at the station to see if relationship with aerosol Arctic haze and ozone concentrations, can’t reliably interpolate between BrO profiles, ozone instrument was positioned at sea-level while the BrO profiles were collected at 600 meter elevation, this could lead to instruments measuring different air masses (should utilize back trajectories and wind observations to better analyze air mass similarity between measurements), part of polar sunrise campaign that go back to 2010, another surface ozone instrument might be funded for installation at the 600 meter elevation in the future so that BrO profiles can be co-located


Action Items:

  • Email out aerosol inventory from aerosol WG to ozone/trace gases WG (Crepinsek)