A Physically Based Estimate of Radiative Forcing by Anthropogenic Sulfate Aerosol

Ghan, Steven J.; Easter, Richard C.; Chapman, Elaine G.; Abdul-Razzak, Hayder; Abdul-Razzak, Hayder; Zhang, Yang; Leung, Lai-Yung; Laulainen, Nels S.; Saylor, Rick D.; Zaveri, Rahul A.

doi:10.1029/2000JD900503

A Physically Based Estimate of Radiative Forcing by Anthropogenic Sulfate Aerosol

Journal Article · Tue Mar 27 04:00:00 EST 2001 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1029/2000JD900503· OSTI ID:1687388

^[1]; ^[1]; Chapman, Elaine G. ^[1]; Abdul-Razzak, Hayder ^[2]; Abdul-Razzak, Hayder ^[2]; Zhang, Yang ^[1]; ^[1]; Laulainen, Nels S. ^[1]; Saylor, Rick D. ^[1]; ^[1]

BATTELLE (PACIFIC NW LAB)
Texas A & M University

Estimates of direct and indirect radiative forcing by anthropogenic sulfate aerosols from an integrated global aerosol and climate modeling system are presented. A detailed global tropospheric chemistry and aerosol model that predicts concentrations of oxidants as well as aerosols and aerosol precursors, is coupled to a general circulation model that predicts both cloud water mass and cloud droplet number. Both number and mass of several externally-mixed aerosol size modes are predicted, with internal mixing assumed for the different aerosol components within each mode. Predicted aerosol species include sulfate, organic and black carbon, soil dust, and sea salt. The models use physically-based treatments of aerosol radiative properties (including dependence on relative humidity) and aerosol activation as cloud condensation nuclei. Parallel simulations with and without anthropogenic sulfate aerosol are performed for a global domain. The global and annual mean direct and indirect radiative forcing due to anthropogenic sulfate are estimated to be -0.3 to -0.5 and -1.5 to -3.0 W m-2, respectively. The radiative forcing is sensitive to the model's horizontal resolution, the use of predicted vs. analyzed relative humidity, the prediction vs. diagnosis of aerosol number and droplet number, and the parameterization of droplet collision/coalescence. About half of the indirect radiative forcing is due to changes in droplet radius and half to increased cloud liquid water.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1687388

Report Number(s):: PNWD-SA-5024

Journal Information:: Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: D6 Vol. 106

Country of Publication:: United States

Language:: English

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