Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0169.1 |
Entrainment versus Dilution in Tropical Deep Convection | |
Hannah, Walter M. | |
2017-11-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The distinction between entrainment and dilution is investigated with cloud-resolving simulations of deep convection in a tropical environment. A method for estimating the rate of dilution by entrainment and detrainment is presented and calculated for a series of bubble simulations with a range of initial radii. Entrainment generally corresponds to dilution of convection, but the two quantities are not well correlated. Core dilution by entrainment is significantly reduced by the presence of a shell of moist air around the core. Dilution by entrainment also increases with increasing updraft velocity but only for sufficiently strong updrafts. Entrainment contributes significantly to the total net dilution, but detrainment and the various source/sink terms play large roles depending on the variable in question. Detrainment has a concentrating effect on average that balances out the dilution by entrainment. The experiments are also used to examine whether entrainment or dilution scale with cloud radius. The results support a weak negative relationship for dilution but not for entrainment. The sensitivity to resolution is briefly discussed. A toy Lagrangian thermal model is used to demonstrate the importance of the cloud shell as a thermodynamic buffer to reduce the dilution of the core by entrainment. The results suggest that explicit cloud heterogeneity may be a useful consideration for future convective parameterization development. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417994800012 |
WOS关键词 | CLOUD-ENVIRONMENT INTERFACE ; SHALLOW CUMULUS CONVECTION ; GENERAL-CIRCULATION MODEL ; VERTICAL VELOCITY ; INTRASEASONAL VARIABILITY ; OCEANIC CONVECTION ; ARAKAWA-SCHUBERT ; MOIST CONVECTION ; TOP ENTRAINMENT ; MASS FLUX |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29734 |
专题 | 地球科学 |
作者单位 | Lawrence Livermore Natl Lab, Livermore, CA 94550 USA |
推荐引用方式 GB/T 7714 | Hannah, Walter M.. Entrainment versus Dilution in Tropical Deep Convection[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(11). |
APA | Hannah, Walter M..(2017).Entrainment versus Dilution in Tropical Deep Convection.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(11). |
MLA | Hannah, Walter M.."Entrainment versus Dilution in Tropical Deep Convection".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.11(2017). |
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