HR: 09:30h
AN: A51F-10    [Abstracts]
TI: Aerosol Properties Over the Eastern US in July 2002: Comparison of Long-Term Measurements With Results From a Coupled Meteorology-Chemistry Model
AU: * Shankar, U
EM: ushankar@unc.edu
AF: 1Institute for the Environment, University of North Carolina, Chapel Hill, NC 27599-6116, United States
AU: Husain, L
EM: husain@wadsworth.org
AF: 2Wadsworth Center, NYS Department of Health, ESP, PO Box 509, Albany, NY 12201-0509, United States
AU: Husain, L
EM: husain@wadsworth.org
AF: 3Department of Environmental Health Sciences, School of Public Health, ESP, PO Box 509, Albany, NY 12201-0509, United States
AU: Khan, A J
AF: 2Wadsworth Center, NYS Department of Health, ESP, PO Box 509, Albany, NY 12201-0509, United States
AU: Ahmed, T
EM: txa03@helath.state.ny.us
AF: 3Department of Environmental Health Sciences, School of Public Health, ESP, PO Box 509, Albany, NY 12201-0509, United States
AU: Adelman, Z
AF: 1Institute for the Environment, University of North Carolina, Chapel Hill, NC 27599-6116, United States
AU: Xiu, A
AF: 1Institute for the Environment, University of North Carolina, Chapel Hill, NC 27599-6116, United States
AU: Arunachalam, S
AF: 1Institute for the Environment, University of North Carolina, Chapel Hill, NC 27599-6116, United States
AB: Elemental or black carbon aerosols absorb solar radiation and have direct and indirect effect on radiative forcing. Unfortunately, global EC data are rather sparse. Therefore, for planetary radiative forcing calculations atmospheric EC burdens are obtained from model estimates based on energy consumptions. In this work we have attempted to evaluate a multiscale integrated model for aerosol physics, chemistry and radiative effects using measurements of EC and sulfate at two sites in New York State. The EC and sulfate concentrations were measured for January, February, July and August 2002 at Mayville, and Whiteface Mountain. Our Mayville site is located near Lake Chautauqua, ~ 100 km southwest of Buffalo and ~ 530 km upwind of Whiteface Mountain. Our observatory at Whiteface Mountain is located at an altitude of 1.5 km above mean sea level. Whereas at Mayville samples were collected daily, the duration of sampling at Whiteface Mountain varied from 6 to 48 h. The samples were analyzed for EC using the thermal optical method and sulfate by ion chromatography. The observations of elemental carbon and sulfate from Whiteface and Mayville for the summer of 2002 have been used along with other network measurements from the IMPROVE and CASTNet networks to evaluate METCHEM, a tightly coupled meteorology-chemistry model in nested simulations over the U.S. to examine the radiative impacts of absorbing and scattering aerosols. The model is being driven by a high-quality bottom-up inventory of emissions compiled by the Regional Planning Organizations for their 2002 visibility assessments, and the National Emissions Inventories compiled previously by the U.S. EPA in the years 2002 and 1999. The model was used to compare both the effects of evolving emissions, and the successive improvements in characterizing wildfire emissions in each of these inventories. Results of aerosol concentrations and aerosol optical depths are compared for a 3-week test period of simulation using the RPO and EPA 2002 inventories.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting