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DOI10.5194/gmd-10-1703-2017
Description and evaluation of the Community Multiscale Air Quality (CMAQ) modeling system version 5.1
Appel, K. Wyat1; Napelenok, Sergey L.1; Foley, Kristen M.1; Pye, Havala O. T.1; Hogrefe, Christian1; Luecken, Deborah J.1; Bash, Jesse O.1; Roselle, Shawn J.1; Pleim, Jonathan E.1; Foroutan, Hosein1; Hutzell, William T.1; Pouliot, George A.1; Sarwar, Golam1; Fahey, Kathleen M.1; Gantt, Brett2; Gilliam, Robert C.1; Heath, Nicholas K.1; Kang, Daiwen1; Mathur, Rohit1; Schwede, Donna B.1; Spero, Tanya L.3; Wong, David C.1; Young, Jeffrey O.1
发表日期2017-04-21
ISSN1991-959X
卷号10期号:4页码:1703-1732
英文摘要

The Community Multiscale Air Quality (CMAQ) model is a comprehensive multipollutant air quality modeling system developed and maintained by the US Environmental Protection Agency's (EPA) Office of Research and Development (ORD). Recently, version 5.1 of the CMAQ model (v5.1) was released to the public, incorporating a large number of science updates and extended capabilities over the previous release version of the model (v5.0.2). These updates include the following: improvements in the meteorological calculations in both CMAQ and the Weather Research and Forecast (WRF) model used to provide meteorological fields to CMAQ, updates to the gas and aerosol chemistry, revisions to the calculations of clouds and photolysis, and improvements to the dry and wet deposition in the model. Sensitivity simulations isolating several of the major updates to the modeling system show that changes to the meteorological calculations result in enhanced afternoon and early evening mixing in the model, periods when the model historically underestimates mixing. This enhanced mixing results in higher ozone (O-3) mixing ratios on average due to reduced NO titration, and lower fine particulate matter (PM2.5) concentrations due to greater dilution of primary pollutants (e.g., elemental and organic carbon). Updates to the clouds and photolysis calculations greatly improve consistency between the WRF and CMAQ models and result in generally higher O-3 mixing ratios, primarily due to reduced cloudiness and attenuation of photolysis in the model. Updates to the aerosol chemistry result in higher secondary organic aerosol (SOA) concentrations in the summer, thereby reducing summertime PM2.5 bias (PM2.5 is typically underestimated by CMAQ in the summer), while updates to the gas chemistry result in slightly higher O-3 and PM2.5 on average in January and July. Overall, the seasonal variation in simulated PM2.5 generally improves in CMAQv5.1 (when considering all model updates), as simulated PM2.5 concentrations decrease in the winter (when PM2.5 is generally overestimated by CMAQ) and increase in the summer (when PM2.5 is generally underestimated by CMAQ). Ozone mixing ratios are higher on average with v5.1 vs. v5.0.2, resulting in higher O-3 mean bias, as O-3 tends to be overestimated by CMAQ throughout most of the year (especially at locations where the observed O-3 is low); however, O-3 correlation is largely improved with v5.1. Sensitivity simulations for several hypothetical emission reduction scenarios show that v5.1 tends to be slightly more responsive to reductions in NOx (NO + NO2), VOC and SOx (SO2 + SO4) emissions than v5.0.2, representing an improvement as previous studies have shown CMAQ to underestimate the observed reduction in O-3 due to large, widespread reductions in observed emissions.


语种英语
WOS记录号WOS:000399916300001
来源期刊GEOSCIENTIFIC MODEL DEVELOPMENT (IF:5.154[JCR-2018],5.697[5-Year])
来源机构美国环保署
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/57304
作者单位1.US EPA, Computat Exposure Div, Natl Exposure Res Lab, Off Res & Dev, Res Triangle Pk, NC 27711 USA;
2.US EPA, Air Qual Anal Div, Off Air Qual Planning & Stand, Off Air & Radiat, Res Triangle Pk, NC 27711 USA;
3.US EPA, Syst Exposure Div, Natl Exposure Res Lab, Off Res & Dev, Res Triangle Pk, NC 27711 USA
推荐引用方式
GB/T 7714
Appel, K. Wyat,Napelenok, Sergey L.,Foley, Kristen M.,et al. Description and evaluation of the Community Multiscale Air Quality (CMAQ) modeling system version 5.1[J]. 美国环保署,2017,10(4):1703-1732.
APA Appel, K. Wyat.,Napelenok, Sergey L..,Foley, Kristen M..,Pye, Havala O. T..,Hogrefe, Christian.,...&Young, Jeffrey O..(2017).Description and evaluation of the Community Multiscale Air Quality (CMAQ) modeling system version 5.1.GEOSCIENTIFIC MODEL DEVELOPMENT,10(4),1703-1732.
MLA Appel, K. Wyat,et al."Description and evaluation of the Community Multiscale Air Quality (CMAQ) modeling system version 5.1".GEOSCIENTIFIC MODEL DEVELOPMENT 10.4(2017):1703-1732.
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