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Evaluation of the Community Multiscale Air Quality (Cmaq) Model V5.0 Against Size-resolved Measurements of Inorganic Particle Composition Across Sites in North America : Volume 8, Issue 5 (19/05/2015)

By Nolte, C. G.

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Book Id: WPLBN0004009851
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: Evaluation of the Community Multiscale Air Quality (Cmaq) Model V5.0 Against Size-resolved Measurements of Inorganic Particle Composition Across Sites in North America : Volume 8, Issue 5 (19/05/2015)  
Author: Nolte, C. G.
Volume: Vol. 8, Issue 5
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Bhave, P. V., Kelly, J. T., Zhang, L., Appel, K. W., Nolte, C. G., Collett Jr, J. L.,...Young, J. O. (2015). Evaluation of the Community Multiscale Air Quality (Cmaq) Model V5.0 Against Size-resolved Measurements of Inorganic Particle Composition Across Sites in North America : Volume 8, Issue 5 (19/05/2015). Retrieved from http://kindle.worldlibrary.net/


Description
Description: Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA. This work evaluates particle size-composition distributions simulated by the Community Multiscale Air Quality (CMAQ) model using Micro-Orifice Uniform Deposit Impactor (MOUDI) measurements at 18 sites across North America. Size-resolved measurements of particulate SO42−, NO3, NH4+, Na+, Cl, Mg2+, Ca2+ and K+ are compared to CMAQ model output for discrete sampling periods between 2002 and 2005. The observation sites were predominantly in remote areas (e.g. National Parks) in the United States and Canada, and measurements were typically made for a period of roughly one month. For SO42− and NH4+, model performance was consistent across the US and Canadian sites, with the model slightly overestimating the peak particle diameter and underestimating the peak particle concentration compared to the observations. Na+ and Mg2+ size distributions were generally well represented at coastal sites, indicating reasonable simulation of emissions from sea spray. CMAQ is able to simulate the displacement of Cl in aged sea spray aerosol, though the extent of Cl depletion relative to Na+ is often underpredicted. The model performance for NO3 exhibited much more site-to-site variability than that of SO42− and NH4+, with the model ranging from an underestimation to overestimation of both the peak diameter and peak particle concentration across the sites. Computing PM2.5 from the modeled size distribution parameters rather than by summing the masses in the Aitken and accumulation modes resulted in differences in daily averages of up to 1 Μg m−3 (10%), while the difference in seasonal and annual model performance compared to observations from the IMPROVE, CSN and AQS networks was very small. Two updates to the CMAQ aerosol model – changes to the assumed size and mode width of emitted particles and the implementation of gravitational settling – resulted in small improvements in modeled size distributions.

Summary
Evaluation of the Community Multiscale Air Quality (CMAQ) model v5.0 against size-resolved measurements of inorganic particle composition across sites in North America

Excerpt
Appel, K. W., Bhave, P. V., Gilliland, A. B., Sarwar, G., and Roselle, S. J.: Evaluation of the Community Multiscale Air Quality (CMAQ) model version 4.5: sensitivities impacting model performance; Part II – Particulate matter, Atmos. Environ., 42, 6057–6066, doi:10.1016/j.atmosenv.2008.03.036, 2008.; Appel, K. W., Pouliot, G. A., Simon, H., Sarwar, G., Pye, H. O. T., Napelenok, S. L., Akhtar, F., and Roselle, S. J.: Evaluation of dust and trace metal estimates from the Community Multiscale Air Quality (CMAQ) model version 5.0, Geosci. Model Dev., 6, 883–899, doi:10.5194/gmd-6-883-2013, 2013.; Baker, K. R. and Foley, K. M.: A nonlinear regression model estimating single source concentrations of primary and secondarily formed PM2.5, Atmos. Environ., 45, 3758–3767, doi:10.1016/j.atmosenv.2011.03.074, 2011.; Bash, J. O., Cooter, E. J., Dennis, R. L., Walker, J. T., and Pleim, J. E.: Evaluation of a regional air-quality model with bidirectional NH3 exchange coupled to an agroecosystem model, Biogeosciences, 10, 1635–1645, doi:10.5194/bg-10-1635-2013, 2013.; Allen, D. J., Pickering, K. E., Pinder, R. W., Henderson, B. H., Appel, K. W., and Prados, A.: Impact of lightning-NO on eastern United States photochemistry during the summer of 2006 as determined using the CMAQ model, Atmos. Chem. Phys., 12, 1737–1758, doi:10.5194/acp-12-1737-2012, 2012.; Asgharian, B., Hofmann, W., and Bergmann, R.: Particle deposition in a multiple-path model of the human lung, Aerosol Sci. Tech., 34, 332–339, 2001.; Bey, I., Jacob, D. J., Yantosca, R. M., Logan, J. A., Field, B. D., Fiore, A. M., Li, Q., Liu, H. Y., Mickley, L. J., and Schulz, M. G.: Global modeling of tropospheric chemistry with assimilated meteorology: model description and evaluation, J. Geophys. Res., 106, 23073–23095, doi:10.1029/2001JD000807, 2001.; Binkowski, F. S. and Roselle, S. J.: Models-3 Community Multiscale Air Quality (CMAQ) model aerosol component. 1. Model description, J. Geophys. Res., 108, 4183–4201, 2003.; Binkowski, F. S. and Shankar, U.: The Regional Particulate Matter Model 1. Model description and preliminary results, J. Geophys. Res., 100, 26191–26209, 1995.; Cabada, J. C., Rees, S., Takahama, S., Khlystov, A., Pandis, S. N., Davidson, C. I., and Robinson, A. L.: Mass size distributions and size resolved chemical composition of fine particulate matter at the Pittsburgh supersite, Atmos. Environ., 38, 3127–3141, doi:10.1016/j.atmosenv.2004.03.004, 2004.; Cooter, E. J., Bash, J. O., Benson, V., and Ran, L.: Linking agricultural crop management and air quality models for regional to national-scale nitrogen assessments, Biogeosciences, 9, 4023–4035, doi:10.5194/bg-9-4023-2012, 2012.; Delfino, R. J., Staimer, N., and Vaziri, N. D.: Air pollution and circulating biomarkers of oxidative stress, Air Qual. Atmos. Health, 4, 37–52, doi:10.1007/s11869-010-0095-2, 2011.; Elleman, R. A. and Covert, D. S.: Aerosol size distribution modeling with the Community Multiscale Air Quality modeling system in the Pacific northwest: 3. Size distribution of particles emitted into a mesoscale model, J. Geophys. Res., 115, D03204, doi:10.1029/2009JD012401, 2010.; Evans, M. C., Campbell, S. W., Bhethanabotla, V., and Poor, N. D.: Effect of sea salt and calcium carbonate interactions

 

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