| NSF Org: |
AGS Division of Atmospheric and Geospace Sciences |
| Recipient: |
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| Initial Amendment Date: | July 21, 2004 |
| Latest Amendment Date: | August 8, 2008 |
| Award Number: | 0413426 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
John Eugene Mak
AGS Division of Atmospheric and Geospace Sciences GEO Directorate for Geosciences |
| Start Date: | September 1, 2004 |
| End Date: | August 31, 2009 (Estimated) |
| Total Intended Award Amount: | $0.00 |
| Total Awarded Amount to Date: | $338,546.00 |
| Funds Obligated to Date: |
FY 2005 = $145,753.00 FY 2007 = $9,246.00 FY 2008 = $9,725.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
1380 LAWRENCE ST STE 300 DENVER CO US 80204-2055 (303)724-0090 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
1380 LAWRENCE ST STE 300 DENVER CO US 80204-2055 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): | Atmospheric Chemistry |
| Primary Program Source: |
app-0105 app-0107 01000809DB NSF RESEARCH & RELATED ACTIVIT |
| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
This project examines, through field observations, the hypothesis that sea-salt aerosol has alkalinity amounts enhanced over that in sea water, which then leads to increased importance of processes that are more important at higher pH (lower acidity), such as oxidation of sulfur dioxide by ozone. These processes compete with the aqueous phase oxidation of sulfur dioxide by hydrogen peroxide, and the gas phase oxidation by hydroxyl radicals. The investigations will be accomplished by making size resolved measurements of aerosol ionic composition under a variety of conditions of biological primary productivity, cloudiness, and season. Composition measurements as a function of aerosol size are important because the alkalinity enhancements appear to be more significant for larger sizes. These data will be used to derive estimates of the contribution of this mechanism to the global sulfur cycle.
This research will help define mechanisms that can be incorporated into chemical transport models that should lead to improved simulation of sulfur transformations in the marine boundary layer. Students will be supported and involved in this project.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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