| NSF Org: |
AGS Division of Atmospheric and Geospace Sciences |
| Recipient: |
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| Initial Amendment Date: | March 15, 2004 |
| Latest Amendment Date: | February 14, 2006 |
| Award Number: | 0342386 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
Bradley F. Smull
AGS Division of Atmospheric and Geospace Sciences GEO Directorate for Geosciences |
| Start Date: | March 1, 2004 |
| End Date: | February 29, 2008 (Estimated) |
| Total Intended Award Amount: | $321,224.00 |
| Total Awarded Amount to Date: | $321,224.00 |
| Funds Obligated to Date: |
FY 2005 = $102,872.00 FY 2006 = $75,588.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
75 LOWER COLLEGE RD RM 103 KINGSTON RI US 02881-1974 (401)874-2635 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
75 LOWER COLLEGE RD RM 103 KINGSTON RI US 02881-1974 |
| 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): |
PHYSICAL METEOROLOGY, Atmospheric Chemistry, Physical & Dynamic Meteorology |
| Primary Program Source: |
app-0105 app-0106 |
| 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
The investigators will contribute to the "Rain in Cumulus over the Ocean" (RICO) experiment by measuring the concentration of hydrogen peroxide and methylhydroperoxide inside and in the vicinity of clouds studied by a research aircraft, the C-130, during flights near Antigua. In combination with other measurements, the measured concentrations will indicate cloud age and the amount of environmental air entrained into the clouds. The broader RICO experiment seeks to study the mechanisms of warm-rain formation, so indications of cloud age can make substantial contributions to the broader experimental objectives by indicating the time available for formation of rain. The study will also characterize the oxidization that occurs in cloud droplets and investigate if substantial production of soluble material occurs as a consequence, causing the residue left upon evaporation of a droplet to be substantially more active as a cloud condensation nucleus than was the original nucleus on which the droplet formed. Furthermore, the two peroxide species are distributed differently in the vertical as a result of precipitation, so their ratio can identify parcels that have been affected by precipitation. These studies will all contribute to better understanding of precipitation processes and the characteristics of trade wind Cumulus clouds.
The work will also make important contributions to the training of graduate and undergraduate students and so help develop future capabilities for research in atmospheric chemistry. The techniques to be developed, if shown to be successful, could become important components of future cloud studies. By improving understanding of how oxidation contributes to the growth and modification of cloud condensation nuclei, the project has the potential to help develop a better understanding of the chemical processes that control the microstructure of clouds and hence the interactions of clouds with the climate system.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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