GSTDTAP  > 地球科学
DOI10.1175/JAS-D-16-0333.1
A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains
Gebauer, Joshua G.1,2; Fedorovich, Evgeni1; Shapiro, Alan1,3
2017-10-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2017
卷号74期号:10
文章类型Article
语种英语
国家USA
英文摘要

The forcing of northerly low-level jets over the eastward-sloped terrain of the U.S. Great Plains was studied using a one-dimensional (1D) nonstationary analytical model based on the Boussinesq-approximated equations of motion and thermal energy. For northerly low-level jets, the forcing from diurnal changes in surface heating of the sloped terrain (Holton mechanism) is out of phase with the nocturnal inertial oscillation resulting from the cessation of turbulent mixing at sunset (Blackadar mechanism), which results in weaker northerly nocturnal low-level jets when compared to southerly nocturnal low-levels jets with the same-magnitude background pressure gradient forcing. Because of the Blackadar and Holton mechanisms acting out of phase, nocturnal northerly low-level jets cannot solely explain the northerly low-level jet maximum over the Great Plains found in climatological studies. It is shown that negative buoyancy values over the eastward-sloped terrain enhance the low-level northerly geostrophic wind, which can cause low-level jetlike wind profiles that do not necessarily depend on the diurnal cycle. However, nocturnal northerly low-level jets primarily caused by an inertial oscillation still occur when daytime mixing is strong and buoyancy is small at sunset. These conditions are possible when strong capping inversions are present in the daytime convective boundary layer. The occurrence of both types of northerly low-level jets, those caused by negative buoyancy values over the sloped terrain and those driven by an inertial oscillation, better explains the findings of previous low-level jet climatologies.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000417993900006
WOS关键词ATMOSPHERIC BOUNDARY-LAYER ; WIND ENERGY ; URBAN OZONE ; CLIMATOLOGY ; TRANSPORT ; OSCILLATION ; EPISODE ; STREAKS ; COMPLEX ; MODEL
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/29365
专题地球科学
作者单位1.Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA;
2.Univ Oklahoma, Cooperat Inst Mesoscale Meteorol Studies, Norman, OK 73019 USA;
3.Univ Oklahoma, Ctr Anal & Predict Storms, Norman, OK 73019 USA
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GB/T 7714
Gebauer, Joshua G.,Fedorovich, Evgeni,Shapiro, Alan. A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(10).
APA Gebauer, Joshua G.,Fedorovich, Evgeni,&Shapiro, Alan.(2017).A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(10).
MLA Gebauer, Joshua G.,et al."A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.10(2017).
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