geosummit baseline measurements (greenland environmental observatory at summit)
DESCRIPTION
GEOSummit Baseline Measurements (Greenland Environmental Observatory at Summit). Joe McConnell 1 , Ryan Banta 1 , Tom Cahill 2 , J. Burkhart 3 , and Roger Bales 3 1 Desert Research Institute, Reno, NV, USA 2 University of California, Davis, USA 3 University of California, Merced, USA - PowerPoint PPT PresentationTRANSCRIPT
AON 2008
GEOSummit Baseline Measurements(Greenland Environmental Observatory at Summit)
Joe McConnell1, Ryan Banta1, Tom Cahill2,
J. Burkhart3, and Roger Bales3
1Desert Research Institute, Reno, NV, USA2University of California, Davis, USA
3University of California, Merced, USA
AON PI Annual Meeting, Boulder, CO 2007
AON 2008
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
Summit Camp
AON 2008
Environmental Measurements
AON 2008
Con
cent
ratio
n (p
pb)
Na
Mg
Mn
Ca
Sr
Rb
Al
S
Pb
Surface SnowMeasurements
• Elemental analysis performed using an ICP-MS in a class 100 clean room
Surface Snow Sampling
AON 2008
Con
cent
ratio
n (p
pb)
Na
Mg
Mn
Ca
Sr
Rb
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
AON 2008
10 Day Hysplit Backtrajectoryof Spring Peaks
AON 2008
Con
cent
ratio
n (p
pb)
Na
Mg
Mn
Ca
Sr
Rb
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)
AON 2008
Con
cent
ratio
n (p
pb)
Na
Mg
Mn
Ca
Sr
Rb
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
AON 2008
10 Day Hysplit Backtrajectory of Marine Souces
AON 2008
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
AON 2008
Aerosol Size Fractionation• Dominant size fractions of aerosols are the smaller bins
(0.34 to 0.75 um)
• Fine aerosols uncorrelated with coarse aerosols
AON 2008
Aerosol Characteristics• First spring sulfur peak is from USA• Second sulfur peak is from Asia (cross polar trajectories)
15
913
1721
2529
2610
1418
2226
303
711
1519
2327
3711
1519
2327
314
812
1620
2428
December January February March April May
0
50
100
150
200
250
300
Nanogra
ms/m
3
0.26 to 0.090.34 to 0.26
0.56 to 0.340.75 to 0.56
1.15 to 0.752.5 to 1.15
5.0 to 2.5Inlet to 5.0
Sulfur Aerosols (coal combustion) at the Greenland Summit SiteSpring, 2005
AON 2008
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
AON 2008
Thank you
www.geosummit.org