The Role of Ice and Aerosol Surfaces in Halogen Activation in the Arctic Springtime Boundary Layer
EMSL Project ID
25625
Abstract
The UAF research group of Prof. Simpson is performing an intensive field campaign in Barrow, Alaska during March 2007. The goal of this field campaign is to quantify the amounts of reactive bromine (in the gas phase) and bromide ions in the relevant reservoirs (snow, frost flowers, and aerosol particles). Aerosol will be collected via a number of aerosol samplers provided by the PNNL research group. These include multi-stage DRUM and modified DRUM samplers. Samples collected with the DRUM and modified DRUM devices will allow laboratory analysis to provide quantitative mass loading measurements in specific size-resolved bins. The total mass of deposited aerosols will be determined with on-axis scanning transmission ion microscopy (STIM). The elemental mass loading of iron and other elements will be measured using proton induced X-ray emission (PIXE). Hydrogen mass concentration in the aerosol will be determined by proton elastic scattering analysis (PESA). Some of the modified drum samples will be analyzed by ion chromatography (IC), as is used on the snow samples. These size-selected aerosol measurements will provide a time series of aerosol chemical composition, with particular emphasis on bromine and ratios of bromine to other ions. Finally, the particle samples will be also subject to microscopy and micro-spectroscopy analyses techniques available at EMSL.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2007-06-08
End Date
2009-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members