HR: 08:40h
AN: A51G-03 [Abstracts]
TI: Aerosol Direct Radiative Effects Over the Northwest Atlantic, Northwest Pacific, and North Indian
Oceans: Estimates Based on In-situ Chemical and Optical Measurements and Chemical Transport
Modeling
AU: * Bates, T S
EM: tim.bates@noaa.gov
AF: NOAA/PMEL, 7600 Sand Point Way NE, Seattle, WA 98115
United States
AU: Anderson, T L
A51G-03
AF: Univ. Washington, Dept. Atmos. Sciences, Seattle, WA 98195
United States
AU: Baynard, T
A51G-03
AF: NOAA/AL, 325 Broadway, Boulder, CO 80303
United States
AU: Bond, T
A51G-03
AF: Univ. Illinois, 205 N. Mathews Ave., Urbana, IL 61801
United States
AU: Boucher, O
A51G-03
AF: Met Office, FitzRoy Road, Exeter, EX1 3PB
United Kingdom
AU: Carmichael, G
A51G-03
AF: Univ. Iowa, College of Engineering, Iowa CIty, IA 52242
United States
AU: Clarke, A
A51G-03
AF: Univ. Hawaii, 1000 Pope Road, Honolulu, HI 96822
United States
AU: Erlick, C
A51G-03
AF: The Hebrew Univ. Jerusalem, Dept. Atmos. Sci., Jerusalem, 91904
Israel
AU: Guo, H
A51G-03
AF: Univ. Michigan, Oceanic and Space Sci., Ann Arbor, MI 48109
United States
AU: Horowitz, L
A51G-03
AF: NOAA/GFDL, PO Box 308, Princeton, NJ 08542
United States
AU: Howell, S
A51G-03
AF: Univ. Hawaii, 1000 Pope Road, Honolulu, HI 96822
United States
AU: Kulkarni, S
A51G-03
AF: Univ. Iowa, College of Engineering, Iowa CIty, IA 52242
United States
AU: Maring, H
A51G-03
AF: NASA Headquarters, Radiation Science Program, Washington, DC, 20546
United States
AU: McComiskey, A
A51G-03
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80303
United States
AU: Middlebrook, A
A51G-03
AF: NOAA/AL, 325 Broadway, Boulder, CO 80303
United States
AU: Noone, K
A51G-03
AF: IGBP, Royal Swedish Academy of Sciences, Stockholm, S-104 05
Sweden
AU: O'Dowd, C D
A51G-03
AF: National Univ. Ireland, Dept. Physics, Galway, 00000
Ireland
AU: Ogren, J A
A51G-03
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80303
United States
AU: Penner, J
A51G-03
AF: Univ. Michigan, Oceanic and Space Sci., Ann Arbor, MI 48109
United States
AU: Quinn, P K
A51G-03
AF: NOAA/PMEL, 7600 Sand Point Way NE, Seattle, WA 98115
United States
AU: Ravishankara, A R
A51G-03
AF: NOAA/AL, 325 Broadway, Boulder, CO 80303
United States
AU: Savoie, D L
A51G-03
AF: Univ. Miami, RSMAS, Miami, FL 33149
United States
AU: Schwartz, S E
A51G-03
AF: BNL, Atmos. Sci. Division, Upton, NY 11973
United States
AU: Shinozuka, Y
A51G-03
AF: Univ. Hawaii, 1000 Pope Road, Honolulu, HI 96822
United States
AU: Tang, Y
A51G-03
AF: Univ. Iowa, College of Engineering, Iowa CIty, IA 52242
United States
AU: Weber, R J
A51G-03
AF: Georgia Inst. Technol., School Earh and Atmos. Sci., Atlanta, GA 30332
United States
AU: Wu, Y
A51G-03
AF: Univ. Washington, Dept. Atmos. Sciences, Seattle, WA 98195
United States
AB:
The largest uncertainty in the radiative forcing of climate change over the industrial era is that due to aerosols, a
substantial fraction of which is the uncertainty associated with scattering and absorption of shortwave (solar) radiation by
anthropogenic aerosols in cloud-free conditions. Quantifying and reducing the uncertainty in aerosol influences on climate is
critical to understanding climate change over the industrial period and to improving predictions of future climate change
for assumed emission scenarios. Measurements of aerosol properties during major field campaigns in several regions of the
globe during the past decade are contributing to an enhanced understanding of atmospheric aerosols and their effects on light
scattering and climate. The present study, which focuses on three regions downwind of major urban/population centers (North
Indian Ocean during INDOEX, the Northwest Pacific Ocean during ACE-Asia, and the Northwest Atlantic Ocean during ICARTT),
incorporates understanding gained from field observations of aerosol distributions and properties into calculations of
perturbations in radiative fluxes due to these aerosols. This study evaluates the current state of observations and of two
chemical transport models (STEM and MOZART). Measurements of burdens, extinction optical depth, and direct radiative effect
of aerosols (change in radiative flux due to total aerosols) are used as measurement-model check points to assess
uncertainties. In-situ measured and remotely sensed aerosol properties for each region (mixing state, mass scattering
efficiency, single scattering albedo, and angular scattering properties and their dependences on relative humidity) are used
as input parameters to two radiative transfer models (GFDL and University of Michigan) to constrain estimates of aerosol
radiative effects, with uncertainties in each step propagated through the analysis. Such comparisons with observations and
resultant reductions in uncertainties are essential for improving and developing confidence in climate model calculations
incorporating aerosol forcing.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 3337 Global climate models (1626, 4928)
DE: 3355 Regional modeling
DE: 3359 Radiative processes
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005