التفاصيل البيبلوغرافية
| العنوان: |
Comparison of Source Apportionment and Sensitivity Analysis in a Particulate Matter Air Quality Model. |
| المؤلفون: |
BONYOUNG KOO1 bkoo@environcorp.com, WILSON, GARY M.1, MORRIS, RALPH E.1, DUNKER, ALAN M.2, YARWOOD, GREG1 |
| المصدر: |
Environmental Science & Technology. 9/1/2009, Vol. 43 Issue 17, p6669-6675. 7p. |
| مصطلحات موضوعية: |
*AIR pollution, *MATHEMATICAL models, *EMISSIONS (Air pollution), AIR quality research, PARTICULATE matter, ATMOSPHERIC aerosols, RESEARCH methodology, SENSITIVITY analysis, PARTICLE size distribution |
| مستخلص: |
Two efficient methods to study relationships between particulate matter (PM) concentrations and emission sources are compared in the three-dimensional comprehensive air quality model with extensions (CAMx). Particulate source apportionment technology (PSAT) is a tagged species method that apportions concentrations of PM components to their respective primary precursors, e.g., sulfate is apportioned to SOx, nitrate to NOx, etc. The decoupled direct method (DDM) calculates first-order sensitivities of PM concentrations to model inputs. Both tools were applied to two month long (February and July) PM modeling episodes and evaluated against changes in PM concentrations due to various emission reductions. The results show that source contributions calculated by PSAT start to deviate from the actual model responses as indirect effects from limiting reactants or nonprimary precursor emissions become important. The DDM first-order sensitivity is useful for determining source contributions only if the model response to input changes is reasonably linear. For secondary inorganic PM, the response is linear for emission reductions of 20% in all cases considered and reasonably linear for reductions of 100% in the case of on-road mobile sources. The model response for secondary organic aerosols and primary PM remains nearly linear to 100% reductions in anthropogenic emissions. [ABSTRACT FROM AUTHOR] |
|
Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Business Source Index |
