Impact of consistent boundary layer mixing approaches between NAM and CMAQ
| العنوان: | Impact of consistent boundary layer mixing approaches between NAM and CMAQ |
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| المؤلفون: | Marina Tsidulko, Geoff DiMego, Jeff McQueen, Ivanka Stajner, Mary Hart, Pius Lee, Hsin-Mu Lin, Youhua Tang, Daiwen Kang, Shaocai Yu, Ho-Chun Huang, Paula Davidson, Sarah Lu |
| المصدر: | Environmental Fluid Mechanics. 9:23-42 |
| بيانات النشر: | Springer Science and Business Media LLC, 2008. |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | Physics, Boundary layer, Computer simulation, Meteorology, Turbulence, Planetary boundary layer, Mixed layer, Environmental Chemistry, Air quality index, Mixing (physics), Water Science and Technology, CMAQ |
| الوصف: | Discrepancies in grid structure, dynamics and physics packages in the offline coupled NWS/NCEP NAM meteorological model with the U.S. Environmental Protection Agency Community Multiscale Air Quality (CMAQ) model can give rise to inconsistencies. This study investigates the use of three vertical mixing schemes to drive chemistry tracers in the National Air Quality Forecast Capability (NAQFC). The three schemes evaluated in this study represent various degrees of coupling to improve the commonality in turbulence parameterization between the meteorological and chemistry models. The methods tested include: (1) using NAM predicted TKE-based planetary boundary height, h, as the prime parameter to derive CMAQ vertical diffusivity; (2) using the NAM mixed layer depth to determine h and then proceeding as in (1); and (3) using NAM predicted vertical diffusivity directly to parameterize turbulence mixing within CMAQ. A two week period with elevated surface O3 concentrations during the summer 2006 has been selected to test these schemes in a sensitivity study. The study results are verified and evaluated using the EPA AIRNow monitoring network and other ozonesonde data. The third method is preferred a priori as it represents the tightest coupling option studied in this work for turbulent mixing processes between the meteorological and air quality models. It was found to accurately reproduce the upper bounds of turbulent mixing and provide the best agreement between predicted h and ozonesonde observed relative humidity profile inferred h for sites investigated in this study. However, this did not translate into the best agreement in surface O3 concentrations. Overall verification results during the test period of two weeks in August 2006, did not show superiority of this method over the other 2 methods in all regions of the continental U.S. Further efforts in model improvement for the parameterizations of turbulent mixing and other surface O3 forecast related processes are warranted. |
| تدمد: | 1573-1510 1567-7419 |
| DOI: | 10.1007/s10652-008-9089-0 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::613f4197a10aecd8f8cbff2cd7b88eb3 https://doi.org/10.1007/s10652-008-9089-0 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........613f4197a10aecd8f8cbff2cd7b88eb3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15731510 15677419 |
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| DOI: | 10.1007/s10652-008-9089-0 |