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GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L22809, doi:10.1029/2005GL024322, 2005

Impact of particulate organic matter on the relative humidity dependence of light scattering: A simplified parameterization

P. K. Quinn

Pacific Marine Environmental Laboratory, NOAA, Seattle, Washington, USA


T. S. Bates

Pacific Marine Environmental Laboratory, NOAA, Seattle, Washington, USA


T. Baynard

Aeronomy Laboratory, NOAA, Boulder, Colorado, USA


A. D. Clarke

Department of Oceanography, University of Hawaii at Manoa, Honolulu, Hawaii, USA


T. B. Onasch

Aerodyne Research, Inc., Billerica, Massachusetts, USA


W. Wang

Civil and Environmental Engineering, University of Illinois, Urbana, Illinois, USA


M. J. Rood

Civil and Environmental Engineering, University of Illinois, Urbana, Illinois, USA


E. Andrews

Climate Monitoring and Diagnostics Laboratory, NOAA, Boulder, Colorado, USA


J. Allan

School of Earth, Atmospheric, and Environmental Science, University of Manchester, Manchester, UK


C. M. Carrico

Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA


D. Coffman

Pacific Marine Environmental Laboratory, NOAA, Seattle, Washington, USA


D. Worsnop

Aerodyne Research, Inc., Billerica, Massachusetts, USA


Abstract

Measurements during recent field campaigns downwind of the Indian subcontinent, Asia, and the northeastern United States reveal a substantial decrease in the relative humidity dependence of light scattering, fσsp(RH), with increasing mass fraction of particulate organic matter (POM) for submicrometer aerosol. Using data from INDOEX (INDian Ocean EXperiment), ACE Asia (Aerosol Characterization Experiment – Asia), and ICARTT (International Consortium for Atmospheric Research on Transport and Transformation), we have identified, within measurement limitations, the impact of POM on the fσsp(RH) of accumulation mode sulfate-POM mixtures. The result is a parameterization that quantifies the POM mass fraction - fσsp(RH) relationship for use in radiative transfer and air quality models either as input or as validation. The parameterization is valid where the aerosol consists of an internally mixed sulfate-carbonaceous accumulation mode and other externally mixed components (e.g. sea salt, dust) and is applicable on both global and regional scales.

Received 5 August 2005; accepted 24 October 2005; published 30 November 2005.

Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801, 4906); 0345 Atmospheric Composition and Structure: Pollution: urban and regional (0305, 0478, 4251); 0360 Atmospheric Composition and Structure: Radiation: transmission and scattering; 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 0368 Atmospheric Composition and Structure: Troposphere: constituent transport and chemistry.

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Citation: Quinn, P. K., et al. (2005), Impact of particulate organic matter on the relative humidity dependence of light scattering: A simplified parameterization, Geophys. Res. Lett., 32, L22809, doi:10.1029/2005GL024322.