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Arctic Troposphere Transport and Air Quality Theme

Arctic Troposphere Transport and Air Quality Theme. Jim Sloan University of Waterloo. CANDAC Workshop Toronto 24 October 2007. Arctic Troposphere Transport and Air Quality. Participants: CANDAC: A. Manson, B. McArthur, N. O’Neill, J. Sloan, K. Strong Collaborators: J. McConnell, T. Uttal

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Arctic Troposphere Transport and Air Quality Theme

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  1. Arctic Troposphere Transportand Air Quality Theme Jim SloanUniversity of Waterloo CANDAC WorkshopToronto 24 October 2007

  2. Arctic Troposphere Transport and Air Quality • Participants: • CANDAC: A. Manson, B. McArthur, N. O’Neill, J. Sloan, K. Strong • Collaborators: J. McConnell, T. Uttal • Scientific Interests (focus on aerosols) • Arctic Pollutants and deposition. • Arctic Haze • Chemical Contaminants • Persistent Organic Pollutants, heavy metals, etc. • Polar sunrise chemistry • Meteorology and modelling • Transport and chemistry of PM • Source identification • Size distributions, compositions, etc.

  3. ATTAQ at PEARL • Current activities: • In situ PM monitoring by Aerosol Mass Spectrometer • Size distributions: 0 to ~700 nm • Chemical composition • Sun, star photometers • Aerosol Optical Depth measurements • Wish list: • Addition of conventional aerosol measurements • Size distribution: SMPS • Total local aerosol loading (CPC/TEOM… ?)

  4. Primary Arctic Pollutants • Found in surface snowpack measurements • Transported from lower latitudes and deposited to surface – no local sources Hg andheavy metals POPs

  5. Secondary Pollutants • Found in lower troposphere • Atmospheric reactions at source or in transit Arctic Haze, Barrow

  6. Transport & General Circulation(long term transport) Westerlies transport mid-latitude air towards poles Polar front dynamics and polar cells contribute

  7. Mechanisms for Arctic Transport High latitude averaged transport “Grasshopper” mechanism(Semi-volatile gas phase) AMAP 2002

  8. Transport of Anthropogenic Pollutants • Anthropogenic contaminants atmospherically transported thousands of kilometres from mid- and low-latitude sources to the Arctic troposphere • SOx, heavy metals, POPs • Sulphur aerosols, cause acid rain; climate change • Heavy metals and POPs are biomagnified, causing Arctic predators such as seals, cetacea, and polar bears to have high levels of contamination,, affecting the health of Northern indigenous communities Bard, S. M., “Global transport of anthropogenic contaminants and the consequences for the Arctic marine ecosystem”, Marine Pollution Bulletin, 38, 356-379, 1999.

  9. Ozone transport into the Arctic Trajectory study of ozone transport after polar sunrise surface depletions. April 1992–2000. The maps link specific regions in the Arctic with the observed O3 mole fractions (nmol mol-1) at Alert. The colours show the calculated average mole fractions in air that traversed the area. Contour lines indicate the average travel distance in days to the measurement location. Jan W. Bottenheim and Elton Chan “A trajectory study into the origin of spring time Arctic boundary layer ozone depletion” JGR (D111), D19301, doi:10.1029/2006JD007055, 2006

  10. Transport from European Sources • CTM study of export pathways of pollution from Europe from 1987 to 1997 • Winter pathways are advection to the (1) middle/high latitudes of the North Atlantic Ocean, (2) Russia and the Russian Arctic, • Summer export occurs by both advection and convection; advection predominantly to Russia • Two major regions of convection in summer that loft European pollution into the free troposphere, one centered over Germany and the other over the Ural Mountains in Russia. Duncan, B. N. and I. Bey, A modeling study of the export pathways of pollution from Europe: Seasonal and interannual variations (1987-1997), Journal of Geophysical Research-Atmospheres, 109, 2004..

  11. Identification of source regions(Flexpart footprints for BC sources) Importance of different locations as sources for anthropogenic BC that appears at latitudes north of 70o (= time spent in a specific location x emission at that location) Integrated for 30 days A . Stohl, “Characteristics of atmospheric transport into the Arctic troposphere” JGR (D) 111, D11306, doi:10.1029/2005JD006888, (2006)

  12. Cross-Tropopause Transport • Lagrangian analyses of upward troposphere to stratosphere exchange (TSE) and downward stratosphere to troposphere exchange (STE) in the extratropical Northern Hemisphere from May 1995 to April 1996 • Chemical implications of extratropical cross-tropopause transport • The meridional distribution of the net flux is upward in subtropics, downward in mid-latitudes and weakly upward in the Arctic region. • The localized source regions for deep TSE indicate that pollutants emitted in eastern North America and Asia have an enhanced potential for being rapidly transported into the lowermost stratosphere Wernli, H. and M. Bourqui, A Lagrangian "1-year climatology'' of (deep) cross-tropopause exchange in the extratropical Northern Hemisphere, Journal of Geophysical Research-Atmospheres, 107, 2002.

  13. Dynamics and transportNAO and transport from Europe. (a) Residual NO2 columns [1014 molecules cm−2] retrieved from GOME satellite observations for (NAO+ - NAO−) composites during (1996–2002) winters.(b) Simulated NO2 columns [mg m-2] for a European emission tracer with a 1-day lifetime.White lines: correlation coefficients with the NAO index. S. Eckhardt, et al., “The North Atlantic Oscillation controls air pollution transport to the Arctic” Atmos. Chem. Phys., 3, 1769-1778, 2003.

  14. AMS Report Arrival August 2006

  15. AMS at PEARL Instrument location Inlet and calibration system

  16. Aerosol Mass Spectrometer Components 10-7 Torr ~10-3 Torr QMS 1Torr Inlet 1ATM 10-5 Torr TOF Chopper Heater Aerodynamic Lens Ionizer 10-8 Torr

  17. CFD to design sampling from cold sourcee.g. -40C to 20 C Cylindrically-symmetric heater gives turbulence due to differential expansion Localized heating gives recirculation

  18. Installation of External Inlet The worker The supervisors

  19. Survival of External Inlet After Installation (2006) At Polar Sunrise (2007) Survived the winter but modifications are needed to provide better temperature control

  20. Sulfate 29 Aug – 5 Sept 5 – 12 Sept. Organic 6 – 13 Oct. 13 – 20 Sept. Example Results: Four 1-Week Time SeriesMeasurements of Sulfate & Organics

  21. Aerodynamic Radii • Only small particles are observed Approx. lens transmission limit

  22. 0PAL – CIMEL 327 PEARL – CIMEL 401 AOD Measurements with Sun Photometers In operation at 0PAL and PEARL

  23. Early AOD Results2 April 2007: 0PAL – Fine and coarse; PEARL mostly fine

  24. Resolute Bay optical depths, June 29 June 29 fine mode smoke cloud

  25. PEARL optical depths June 29, 30 smoke Cloud & smoke Smoke layer cloud

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