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| DOI | 10.1002/qj.4711 |
| Generalized eddy-diffusivity mass-flux formulation for the parametrization of atmospheric convection and turbulence | |
| Vraciu, Cristian V. | |
| 发表日期 | 2024 |
| ISSN | 0035-9009 |
| EISSN | 1477-870X |
| 起始页码 | 150 |
| 结束页码 | 761 |
| 卷号 | 150期号:761 |
| 英文摘要 | The atmospheric convection is a phenomenon that has a length scale smaller than the resolution at which the state-of-the-art general circulation numerical models are running, and thus the convection needs to be parametrized. In this work, a theoretical formulation for the parametrization of subgrid-scale convection based on subgrid averaging that represents a generalized eddy-diffusivity mass-flux formulation is presented. The subgrid fluxes are derived by considering a decomposition of subgrid variables into convective and turbulent variables, and by assuming that the convection is modeled by round convective plumes with generic radial profiles. The main difference between our formulation and the mass-flux formulations is that the condition of a very small fractional area occupied by the convection is replaced with the condition that the convective vertical velocity goes to the mean state far from the updraft region of the plume. The plume model can also be generalized by considering that the convective elements are energy-consistent plumes, governed by the conservation of mass, momentum, kinetic energy, and buoyancy, which provides a physical-based closure for the entrainment. Therefore, the closing problem of our formulation consists of the specification of the convective radial profiles and the boundary conditions at the initial vertical level. Furthermore, our formulation allows one to consider more realistic profiles for the convective variables, making the formulation suitable for the parametrization of atmospheric convection at the convective gray zone. This aspect is discussed in the last part of this work, where it is showed how the formulation can be implemented at any resolution. Moreover, in the present framework, no distinct assumptions are required for each convective type, thus facilitating the parametrization of convection in a unified way. In this study a unified parametrization framework for the atmospheric convection and turbulence is proposed. It is showed how, by considering generic radial profiles for the plume model, the present parametrization framework can be implemented at the convective gray zone. Moreover, an energy-consistent plume model is considered, which avoids the entrainmnet closure problem, switching the whole parametrization problem to the turbulence closure and the specification of the convective plume radial profiles. image |
| 英文关键词 | atmospheric convection; gray zone; plume model; turbulence; unified parametrization |
| 语种 | 英语 |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| WOS类目 | Meteorology & Atmospheric Sciences |
| WOS记录号 | WOS:001193929600001 |
| 来源期刊 | QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/305447 |
| 作者单位 | University of Bucharest; Horia Hulubei National Institute of Physics & Nuclear Engineering; University of Bucharest |
| 推荐引用方式 GB/T 7714 | Vraciu, Cristian V.. Generalized eddy-diffusivity mass-flux formulation for the parametrization of atmospheric convection and turbulence[J],2024,150(761). |
| APA | Vraciu, Cristian V..(2024).Generalized eddy-diffusivity mass-flux formulation for the parametrization of atmospheric convection and turbulence.QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY,150(761). |
| MLA | Vraciu, Cristian V.."Generalized eddy-diffusivity mass-flux formulation for the parametrization of atmospheric convection and turbulence".QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY 150.761(2024). |
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