| NSF Org: |
AGS Division of Atmospheric and Geospace Sciences |
| Recipient: |
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| Initial Amendment Date: | April 12, 2019 |
| Latest Amendment Date: | June 6, 2022 |
| Award Number: | 1853639 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Sylvia Edgerton
sedgerto@nsf.gov (703)292-8522 AGS Division of Atmospheric and Geospace Sciences GEO Directorate for Geosciences |
| Start Date: | April 15, 2019 |
| End Date: | March 31, 2024 (Estimated) |
| Total Intended Award Amount: | $679,907.00 |
| Total Awarded Amount to Date: | $708,584.00 |
| Funds Obligated to Date: |
FY 2022 = $28,677.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
160 ALDRICH HALL IRVINE CA US 92697-0001 (949)824-7295 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
Department of Chemistry Irvine CA US 92697-2025 |
| 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: |
01001920DB 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 includes a number of laboratory experiments to study the fate of small particles exposed to sunlight in the atmosphere. Exposure to sunlight can cause chemical changes in the particles that reduces their atmospheric lifetimes. This research will provide valuable information for predicting the fate of aged organic particulate matter and is relevant to understanding the health effects of fine particles in the atmosphere.
The objectives of this research are to: (1) systematically explore the dependence of secondary organic aerosol (SOA) photodegradation rates on the type of SOA and on the conditions of SOA formation; (2) investigate photochemistry of SOA in highly concentrated solutions of inorganic electrolytes mimicking the conditions found in aerosol liquid water; (3) investigate the relative importance of direct and indirect photochemical processes in irradiated SOA; and (4) investigate photodegradation and photosensitization processes in biomass-burning organic aerosols.
The results of these experiments will be used to model the effects of photochemical reactions occurring inside atmospheric organic particles and inside cloud droplets containing dissolved organics on the global atmospheric burden of organic aerosol. This effort will directly support the training of at least two graduate students and at least six undergraduate students.
This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
Atmospheric particulate matter is a major contributor to health effects of urban air pollution. Particulate matter also has a comparable effect on climate to that of major greenhouses gases. To understand how particulate matter affects the Earth climate and health of the population it is important know what happens to particles when they are exposed to solar radiation, humid air, and various gases in the atmosphere. As part of this NSF project, our team, in collaboration with US and international scientists, has carried out a number of laboratory experiments and theoretical calculations to investigate interactions between particulate matter and sunlight. Examples of the types of questions we addressed : (1) How much solar radiation can be absorbed by different types of particulate matter? (2) How does the amount and properties of particulate matter change when they are exposed to ultraviolet radiation from the sun? (3) What sorts of chemical changes take place to different classes or organic molecules in particulate matter that absorb UV radiation? Our research team has been highly productive – we have published twenty nine peer-reviewed papers in leading scientific journals. The information gained from this work will make it possible to more accurately predict the effect of the particulate matter on the environment. The project has provided valuable research training to nine undergraduate students, three postbaccalaureate students, and seven graduate students. All of the project participants have been able to advance their careers by getting jobs in the academic, government and industrial sectors, or by going to more advanced educational institutions.
Last Modified: 06/29/2024
Modified by: Sergey Nizkorodov
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