The Adjoint of CMAQ
| العنوان: | The Adjoint of CMAQ |
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| المؤلفون: | John H. Seinfeld, Amir Hakami, Daven K. Henze, Kumaresh Singh, Qinbin Li, Daewon W. Byun, Adrian Sandu, Soontae Kim |
| المصدر: | Environmental Science & Technology. 41:7807-7817 |
| بيانات النشر: | American Chemical Society (ACS), 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Meteorology, Environment, Classification of discontinuities, Sensitivity and Specificity, Ozone, Residence Characteristics, Air Pollution, Sulfur Dioxide, Environmental Chemistry, Applied mathematics, Sensitivity (control systems), Air Movements, Air Pollutants, Geography, Computer simulation, Advection, Direct method, Temperature, Environmental Exposure, General Chemistry, Solver, United States, Kinetics, Nonlinear system, Models, Chemical, Gases, Software, Environmental Monitoring, CMAQ |
| الوصف: | An adjoint model for the internationally used Community Multiscale Air Quality (CMAQ) modeling platform of the U.S. EPA is developed. The adjoint version for CMAQ (CMAQ-ADJ) provides the user community with forward (decoupled direct method or DDM) and backward (adjoint) sensitivity analysis capabilities. Current implementation is for gas-phase processes. Discrete adjoints are implemented for all processes with the exception of horizontal advection, for which, because of inherent discontinuities in the advection scheme, the continuous approach is superior. The adjoint of chemistry is constructed by interfacing CMAQ with the kinetic pre-processor, which provides for increased flexibility in the choice of chemical solver and facilitates the implementation of new chemical mechanisms. The adjoint implementation is evaluated both on a process-by-process basis and for the full model. In general, adjoint results show good agreement with brute-force and DDM sensitivities. As expected for a continuous adjoint implementation in a nonlinear scheme, the agreement is not perfect for horizontal transport. Sensitivities of various air quality, public health, and environmental metrics with respect to emissions are calculated using the adjoint method. In order to show applicability to regional climate studies, as an example, the sensitivities of these metrics with respect to local temperatures are calculated. |
| تدمد: | 1520-5851 0013-936X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5673a900ee8d5927e096e632db6efa88 https://doi.org/10.1021/es070944p |
| رقم الأكسشن: | edsair.doi.dedup.....5673a900ee8d5927e096e632db6efa88 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 15205851 0013936X |
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