Aerosols

Date: 
Wednesday, June 1, 2016 -
08:30 to 09:00
Agenda: 
  1.   Introductions - 10min
  2.   Presentation on aerosol chemistry (Creamean) - 30min
  3.   Publication updates (Backman, Schmeisser) - 30min
  4.   Other business (ALL) - 10min
Minutes: 

Attending: Taneil Uttal, Sandy Starkweather, Jessie Creamean, Patrick Sheridan, Allison McComiskey, Anne Jefferson, Olga Popovicheva, Aki Virkkula, Eija Asmi, John Backman, Lauren Schmeisser, Nicholas Sprada, Tom Cahill, Andreas Massling, Kostas Eleftheriadis

Jessie Creamean presented a detailed study of the aerosol properties on the North Slope of Alaska from data gathered at the Barrow observatory. Data is available since 1976 to present.  The study looked not only at inter-monthly trends but also relationships between observations since number and mass follow very different seasonal trends. Seasonal trends and co-variability were considered for haze aerosols, (absorption, scattering Nss-sulfate, Nitrate, Ammonium, Nss-calcium Nss-magnesium, Nss-potassium),  Sea Salt aerosols (submicron size, Angstrom Exponent, Single scattering albedo, sea ice conc) and Biogenic aerosols (Methanesulfonic acid, sunlight hours, angstrom exponent, chlorophyll, sea ice conc).  A number of seasonal trends were identified that were consistent with previous results however this study linked disparate observations to build a more comprehensive description of total aerosol population characteristics.  Next steps for this study will be to link aerosol trends to meteorology, clouds, dynamics and to see if long-term trends reflect impacts of regulatory efforts. It was noted that similar aerosol measurement capacity is being instituted at Oliktok Point. 

Jessie noted in 2017 and 2018 that her work would be taking her out into the marine environment on the RUSULCA research cruises where she would be taking filter samples for chemistry, INP and bioanalysis. She also described a innovative balloon platform for aerosol sampling, the HOVERCAT designed to carry a Streaker and POPS aerosol payload.  This concept prompted some exciting discussion about the logistical challenges.

Nicholas Sprada and Tom Cahill have joined the IASOA aerosol WG.  They gave a presentation on an innovative, cost effective DRUM technology that measures size (9 bins) and time resolved continous measurements. They described the technologies for the mass and optical analysis.  Some very interesting results were shown showing size and mass distribtuions and size resolved optical extiinction, wavelength dependence, sulfur measurements at Summit. Size resolved measurements are available for several other parameters (potassium, chlorine, calcium).  The group discussed the data archiving strategies for this data. Taneil noted that NOAA contracted with Cathy Cahill once upon a time to make some DRUM measurements in Barrow, Alaska and suggested that this data be rediscovered.

Lauren Schmeisser and John Backman gave brief updates on the status of the (optical) aerosol calibration/processing and climatology papers.  The target date for having a draft for co-authors to review will be sometime this summer and presentations on the 2 submissions are currently scheduled for the 8/24/2016 IASOA Aerosol WG meeting. John presented a figure of 3-D mapping of trajectory footprintsthat instigated a great deal of discussion. He will follow up with a written description of this figure to support further discussion.

It was agreed that it would be a great exercise to generate an inventory of the aerosol chemistry measurements for all the observatories.  Jessie Creamean has taken this lead on this activity and has already sent an invitationt-to-edit a google spreadsheet.  Any interested parties should contact her (Jessie.Creamean@noaa.gov) with questions. 

It was suggested that Olga Popovicheva make a presentation on Tiksi aerosol chemistry at the July 13 Aerosol WG meeting.

 

 

Supporting Documents: 
Research Group: