| NSF Org: |
AGS Division of Atmospheric and Geospace Sciences |
| Recipient: |
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| Initial Amendment Date: | February 23, 2007 |
| Latest Amendment Date: | June 22, 2009 |
| Award Number: | 0646153 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
Alexander Pszenny
AGS Division of Atmospheric and Geospace Sciences GEO Directorate for Geosciences |
| Start Date: | September 1, 2007 |
| End Date: | August 31, 2011 (Estimated) |
| Total Intended Award Amount: | $0.00 |
| Total Awarded Amount to Date: | $539,582.00 |
| Funds Obligated to Date: |
FY 2008 = $177,528.00 FY 2009 = $181,112.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
601 S COLLEGE RD WILMINGTON NC US 28403-3201 (910)962-3167 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
601 S COLLEGE RD WILMINGTON NC US 28403-3201 |
| 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, Climate & Large-Scale Dynamics |
| Primary Program Source: |
01000809DB NSF RESEARCH & RELATED ACTIVIT 01000910DB 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 addresses the questions: (1) What are the origin and chemical characteristics of chromophoric dissolved organic matter (CDOM) in rainwater? (2) What is CDOM's role in photochemical transformations? (3) What is CDOM's involvement in metal speciation? These questions will be studied with a variety of tools including isotopic analysis, NMR, and controlled photolysis experiments. For the analyses, rainwater CDOM samples will be collected during different seasons, storm types, and locations. The rates and quantum yields for the formation of hydrogen peroxide and other small molecules will be determined with photolysis experiments. The contribution of CDOM nitrogen to dissolved organic nitrogen in rainwater will also be assessed.
This research will provide new information on the chemical and physical factors influencing sources, fate, and atmospheric impacts of rainwater CDOM, which may be the predominant form of carbon in precipitation. CDOM photochemistry affects the spectral attenuation of solar radiation, tropospheric free radical chemistry, oxidizing capacity, acid generating capacity, and trace metal speciation in the atmosphere. Broader impacts also include education and training of a post-doctoral researcher, two master's level graduate students, two undergraduates and one high school student each year. In addition, a local high school science teacher will participate in this research for one month each year.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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