Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0279.1 |
Mesoscale Ascent in Nocturnal Low-Level Jets | |
Shapiro, Alan1,2; Fedorovich, Evgeni1; Gebauer, Joshua G.1,3 | |
2018-05-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:5页码:1403-1427 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A theory for gentle but persistent mesoscale ascent in the lower troposphere is developed in which the vertical motion arises as an inertia-gravity wave response to the sudden decrease of turbulent mixing in a horizontally heterogeneous convective boundary layer (CBL). The zone of ascent is centered on the local maximum of a laterally varying buoyancy field (warm tongue in the CBL). The shutdown also triggers a Blackadar-type inertial oscillation and associated low-level jet (LLJ). These nocturnal motions are studied analytically using the linearized two-dimensional Boussinesq equations of motion, thermal energy, and mass conservation for an inviscid stably stratified fluid, with the initial state described by a zero-order jump model of a CBL. The vertical velocity revealed by the analytical solution increases with the amplitude of the buoyancy variation, CBL depth, and wavenumber of the buoyancy variation (larger vertical velocity for smaller-scale variations). Stable stratification in the free atmosphere has a lid effect, with a larger buoyancy frequency associated with a smaller vertical velocity. For the parameter values typical of the southern Great Plains warm season, the peak vertical velocity is similar to 3-10 cm s(-1), with parcels rising similar to 0.3-1 km over the similar to 6-8-h duration of the ascent phase. Data from the 2015 Plains Elevated Convection at Night (PECAN) field project were used as a qualitative check on the hypothesis that the same mechanism that triggers nocturnal LLJs from CBLs can induce gentle but persistent ascent in the presence of a warm tongue. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000434270600004 |
WOS关键词 | SOUTHERN GREAT-PLAINS ; BOUNDARY-LAYER CONVERGENCE ; CENTRAL UNITED-STATES ; WARM-SEASON PRECIPITATION ; CONVECTIVE SYSTEMS ; SQUALL-LINE ; THUNDERSTORM ACTIVITY ; MOIST CONVECTION ; OUTFLOW BOUNDARY ; DIURNAL CYCLE |
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/29563 |
专题 | 地球科学 |
作者单位 | 1.Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA; 2.Univ Oklahoma, Ctr Anal & Predict Storms, Norman, OK 73019 USA; 3.Univ Oklahoma, Cooperat Inst Mesoscale Meteorol Studies, Norman, OK 73019 USA |
推荐引用方式 GB/T 7714 | Shapiro, Alan,Fedorovich, Evgeni,Gebauer, Joshua G.. Mesoscale Ascent in Nocturnal Low-Level Jets[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(5):1403-1427. |
APA | Shapiro, Alan,Fedorovich, Evgeni,&Gebauer, Joshua G..(2018).Mesoscale Ascent in Nocturnal Low-Level Jets.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(5),1403-1427. |
MLA | Shapiro, Alan,et al."Mesoscale Ascent in Nocturnal Low-Level Jets".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.5(2018):1403-1427. |
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