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Title: Global 2-D intercomparison of sectional and modal aerosol modules

Abstract

We present an intercomparison of two aerosol modules, one sectional, one modal, in a global 2-D model in order to differentiate their behavior for tropospheric and stratospheric applications. We model only binary sulfuric acid-water aerosols in this study. Two versions of the sec-tional model and three versions of the modal model are used to test the sensitivity of background aerosol mass and size distribution to the number of bins or modes and to the pre-scribed width of the largest mode. We find modest sensitivity to the number of bins (40 vs 150) used in the sectional model. Aerosol mass is found to be reduced in a modal model if care is not taken in selecting the width of the largest lognormal mode, reflecting differences in sedimentation in the middle stratosphere. The size distributions calculated by the sec-tional model can be better matched by a modal model with four modes rather than three modes in most but not all sit-uations. A simulation of aerosol decay following the 1991 eruption of Mt. Pinatubo shows that the representation of the size distribution can have a signflcant impact on model-calculated aerosol decay rates in the stratosphere. Between 1991 and 1995, aerosol mass and surfacemore » area density calcu-lated by two versions of the modal model adequately match results from the sectional model. Calculated effective radius for the same time period shows more intermodel variability.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908733
Report Number(s):
PNWD-SA-7668
TRN: US200722%%765
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Atmospheric Chemistry and Physics, 7(9):2339-2355; Journal Volume: 7; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AEROSOLS; TWO-DIMENSIONAL CALCULATIONS; MATHEMATICAL MODELS; STRATOSPHERE; COMPARATIVE EVALUATIONS; TROPOSPHERE; SULFURIC ACID; WATER VAPOR

Citation Formats

Weisenstein, D K, Penner, J E, Herzog, M, and Liu, Xiaohong. Global 2-D intercomparison of sectional and modal aerosol modules. United States: N. p., 2007. Web. doi:10.5194/acp-7-2339-2007.
Weisenstein, D K, Penner, J E, Herzog, M, & Liu, Xiaohong. Global 2-D intercomparison of sectional and modal aerosol modules. United States. doi:10.5194/acp-7-2339-2007.
Weisenstein, D K, Penner, J E, Herzog, M, and Liu, Xiaohong. Tue . "Global 2-D intercomparison of sectional and modal aerosol modules". United States. doi:10.5194/acp-7-2339-2007.
@article{osti_908733,
title = {Global 2-D intercomparison of sectional and modal aerosol modules},
author = {Weisenstein, D K and Penner, J E and Herzog, M and Liu, Xiaohong},
abstractNote = {We present an intercomparison of two aerosol modules, one sectional, one modal, in a global 2-D model in order to differentiate their behavior for tropospheric and stratospheric applications. We model only binary sulfuric acid-water aerosols in this study. Two versions of the sec-tional model and three versions of the modal model are used to test the sensitivity of background aerosol mass and size distribution to the number of bins or modes and to the pre-scribed width of the largest mode. We find modest sensitivity to the number of bins (40 vs 150) used in the sectional model. Aerosol mass is found to be reduced in a modal model if care is not taken in selecting the width of the largest lognormal mode, reflecting differences in sedimentation in the middle stratosphere. The size distributions calculated by the sec-tional model can be better matched by a modal model with four modes rather than three modes in most but not all sit-uations. A simulation of aerosol decay following the 1991 eruption of Mt. Pinatubo shows that the representation of the size distribution can have a signflcant impact on model-calculated aerosol decay rates in the stratosphere. Between 1991 and 1995, aerosol mass and surface area density calcu-lated by two versions of the modal model adequately match results from the sectional model. Calculated effective radius for the same time period shows more intermodel variability.},
doi = {10.5194/acp-7-2339-2007},
journal = {Atmospheric Chemistry and Physics, 7(9):2339-2355},
number = 9,
volume = 7,
place = {United States},
year = {Tue May 08 00:00:00 EDT 2007},
month = {Tue May 08 00:00:00 EDT 2007}
}