NSF Org:	AGS Division of Atmospheric and Geospace Sciences
Recipient:	UNIVERSITY OF CALIFORNIA, SAN DIEGO
Initial Amendment Date:	August 5, 2004
Latest Amendment Date:	June 24, 2006
Award Number:	0431483
Award Instrument:	Continuing Grant
Program Manager:	Anne-Marie Schmoltner AGS  Division of Atmospheric and Geospace Sciences GEO  Directorate for Geosciences
Start Date:	August 15, 2004
End Date:	July 31, 2008 (Estimated)
Total Intended Award Amount:	$415,945.00
Total Awarded Amount to Date:	$415,945.00
Funds Obligated to Date:	FY 2004 = $135,339.00 FY 2005 = $138,596.00 FY 2006 = $142,010.00
History of Investigator:	Mark Thiemens (Principal Investigator) mthiemens@ucsd.edu
Recipient Sponsored Research Office:	University of California-San Diego 9500 GILMAN DR LA JOLLA CA  US  92093-0021 (858)534-4896
Sponsor Congressional District:	50
Primary Place of Performance:	University of California-San Diego 9500 GILMAN DR LA JOLLA CA  US  92093-0021
Primary Place of Performance Congressional District:	50
Unique Entity Identifier (UEI):	UYTTZT6G9DT1
Parent UEI:
NSF Program(s):	Atmospheric Chemistry
Primary Program Source:	app-0104  app-0105  app-0106
Program Reference Code(s):	1309, EGCH
Program Element Code(s):	152400
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.050

ABSTRACT

This project investigates the impacts of anthropogenic activities on tropospheric sulfur and nitrogen cycling in the atmosphere. Existing daily aerosol samples acquired by University of Miami (UM) during a several decade long program will be used to study the mass-independent (oxygen, nitrogen and sulfur) isotope effects in sulfates and nitrates occurring in these samples. Specifically, the Mass Independent Fractionation (MIF) of 17O in sulfate and nitrate components of selected aerosol samples, as well as more traditional sulfur and nitrogen isotope analyses will be used to characterize atmospheric oxidative processes with a view to identifying unique reaction pathways occurring in the ambient environment downwind of anthropogenic and natural sources of sulfate and nitrate precursors. Results from this study will further understanding of aerosol formation and atmospheric transport, particularly with respect to elucidating long term changes in aerosol source signatures and production pathways and the potential of these to impact climate. Support is included for a postdoctoral researcher and one graduate student to gain research experience under the mentorship of the principal investigator.

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