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GEOSummit Baseline Measurements (Greenland Environmental Observatory at Summit)

This study focuses on the unique site of Summit Camp in Greenland, where long-term measurements of surface snow and aerosols are conducted. The study aims to understand the significance of deep ice core records and investigate remote troposphere and hydrology. The data collected includes surface snow measurements of Na, Mg, Ca, Mn, Rb, Sr, Al, and Pb concentrations, as well as aerosol measurements using a drum impactor.

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GEOSummit Baseline Measurements (Greenland Environmental Observatory at Summit)

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  1. GEOSummit Baseline Measurements(Greenland Environmental Observatory at Summit) Joe McConnell1, Ryan Banta1, Tom Cahill2, J. Burkhart3, and Roger Bales3 1Desert Research Institute, Reno, NV, USA 2University of California, Davis, USA 3University of California, Merced, USA AON PI Annual Meeting, Boulder, CO 2007

  2. Summit Camp Why GEOSummit? • Summit is a unique site • Ideal location to study remote troposphere, hydrology, and further understand significance of deep ice core records • long range transport is implicit • reflect atmosphere and snow conditions representative of regional to hemispheric-scale processes • only high elevation mid-troposphere station in northern high latitudes • co-located research including snow-atmosphere chemical transfer studies, long term climate records from deep ice cores, etc. • Year round measurements beginning 2000-2002 • GEOSummit established 2003-2008

  3. Environmental Measurements

  4. Na Mg Ca Mn Rb Sr Concentration (ppb) Al S Pb Surface SnowMeasurements • Elemental analysis performed using an ICP-MS in a class 100 clean room Surface Snow Sampling

  5. Na Mg Ca Mn Rb Sr Concentration (ppb) Al S Pb Surface Snow Measurements • Exhibits periods where many elemental concentrations co-vary • Likely due to similar source areas and/or transport processes • For example, spring peaks

  6. 10 Day Hysplit Backtrajectoryof Spring Peaks

  7. Na Mg Ca Mn Rb Sr Concentration (ppb) Al S Pb Surface Snow Trace Elements- pollution signals • Periods of elevated S and Pb concentrations - possible pollution tracers • Associated with less significant increases in: - Na (sea salt tracer) - Al (dust tracer)

  8. Na Mg Ca Mn Rb Sr Concentration (ppb) Al S Pb Surface Snow Trace Elements- marine sources • Periods of elevated S and Na concentrations - other elemental concentrations are not elevated - possible marine sources

  9. 10 Day Hysplit Backtrajectory of Marine Souces

  10. Aerosol Measurements • Drum impactor measures amount and composition for 8 stages (sizes) • Continuously collects samples every 6 to 24 hours • Data from May 2003 - present

  11. Aerosol Size Fractionation • Dominant size fractions of aerosols are the smaller bins (0.34 to 0.75 um) • Fine aerosols uncorrelated with coarse aerosols

  12. Aerosol Characteristics • First spring sulfur peak is from USA • Second sulfur peak is from Asia (cross polar trajectories)

  13. Data Storage and Dissemination • Currently stored as flat files (.txt) with associated ReadMe metafiles • Made available to the public as soon as QA/QC processes are complete and/or presented in publications • Expand current and future collaborations with several institutions already in progress • Archived at www.geosummit.org

  14. Thank you www.geosummit.org

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