NSF Org:	AGS Division of Atmospheric and Geospace Sciences
Recipient:	REGENTS OF THE UNIVERSITY OF MICHIGAN
Initial Amendment Date:	July 20, 2023
Latest Amendment Date:	June 7, 2024
Award Number:	2333584
Award Instrument:	Continuing Grant
Program Manager:	Sylvia Edgerton sedgerto@nsf.gov  (703)292-8522 AGS  Division of Atmospheric and Geospace Sciences GEO  Directorate for Geosciences
Start Date:	November 15, 2022
End Date:	May 31, 2026 (Estimated)
Total Intended Award Amount:	$491,206.00
Total Awarded Amount to Date:	$263,142.00
Funds Obligated to Date:	FY 2021 = $9,508.00 FY 2022 = $63,996.00 FY 2023 = $93,471.00 FY 2024 = $96,167.00
History of Investigator:	Rachel O'Brien (Principal Investigator) reobrien@umich.edu
Recipient Sponsored Research Office:	Regents of the University of Michigan - Ann Arbor 1109 GEDDES AVE STE 3300 ANN ARBOR MI  US  48109-1015 (734)763-6438
Sponsor Congressional District:	06
Primary Place of Performance:	Regents of the University of Michigan - Ann Arbor 503 THOMPSON ST ANN ARBOR MI  US  48109-1340
Primary Place of Performance Congressional District:	06
Unique Entity Identifier (UEI):	GNJ7BBP73WE9
Parent UEI:
NSF Program(s):	Atmospheric Chemistry
Primary Program Source:	01002122DB NSF RESEARCH & RELATED ACTIVIT 01002223DB NSF RESEARCH & RELATED ACTIVIT 01002324DB NSF RESEARCH & RELATED ACTIVIT 01002425DB NSF RESEARCH & RELATED ACTIVIT 01002526DB NSF RESEARCH & RELATED ACTIVIT
Program Reference Code(s):	102Z, 1045
Program Element Code(s):	152400
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.050

ABSTRACT

This CAREER project focuses on long-term chemical changes that take place in mixtures of atmospheric organic aerosol. Organic molecules in the atmosphere can have large impacts on climate, air quality, and on human health and the environment. One of the goals of this research is to develop a more accurate way to estimate the fraction of carbon emitted into the atmosphere that stays in the condensed phase, both in aerosol and in surface films, as the aerosol ages. Knowledge about the types and extents of slower aging reactions is key to understanding and predicting the behaviors of carbon mixtures in the atmospheric aerosols.

The central hypothesis of this research is that when organic mixtures are aged, functional group distributions change, enabling subsequent accretion reactions. The hypothesis is based on prior work by this investigator who has found that both a-pinene and food cooking organic aerosol films show evidence of oligomerization with long aging times (days to weeks). The objectives of this research are to: (1) investigate the impact of water vapor on the multi-generational aging of secondary organic aerosol, (2) investigate the aging process for components of urban grime, including food cooking organic aerosol and ambient surface films, and (3) help attract and retain students in the atmospheric sciences by partnering with local high schools to develop learning experiences related to air pollution.

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.

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