GSTDTAP  > 地球科学
DOI10.1175/JAS-D-17-0097.1
On Boussinesq Dynamics near the Tropopause
Asselin, Olivier; Bartello, Peter; Straub, David N.
2018-02-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2018
卷号75期号:2页码:571-585
文章类型Article
语种英语
国家Canada
英文摘要

The near-tropopause energy spectrum closely follows a 5/3 power law at mesoscales. Most theories addressing the mesoscale spectrum assume unbalanced dynamics but ignore the tropopause (near which the bulk of the data were collected). Conversely, it has also been proposed that the mesoscale spectrum results from tropopause-induced alterations of geostrophic turbulence. This paper seeks to reconcile these a priori mutually exclusive theories by presenting simulations that permit both unbalanced motion and tropopauseinduced effects. The model integrates the nonhydrostatic Boussinesq equations in the presence of a rapidly varying background stratification profile (an idealized tropopause). Decaying turbulence simulations were performed over a wide range of Rossby numbers. In the limit of weak flow (U <= 1ms(-1)), the essential features of the Boussinesq simulations are well captured by a quasigeostrophic version of the model: secondary roll-ups of filaments and shallow spectral slopes are observed near the tropopause but not elsewhere. However, these tropopause-induced effects rapidly disappear with increasing flow strength. For flow strengths more typical of the tropopause (U similar to 10ms(-1)), the spectrum develops a shallow, near -5/3 tail associated with fast-time-scale, unbalanced motion. In contrast to weak flows, this spectral shallowing is evident at any altitude and regardless of the presence of a tropopause. Diagnostics of the fast component of motion reveal significant inertia-gravity wave activity at large horizontal scales (where the balanced flow dominates). However, no evidence points to such activity in the shallow range. That is, the mesoscale of the model is dominated by unbalanced turbulence, not waves. Implications and limitations of these findings are discussed.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000425753300011
WOS关键词ROTATING STRATIFIED TURBULENCE ; QUASI-GEOSTROPHIC TURBULENCE ; PACIFIC EXPLORATORY MISSIONS ; ATMOSPHERIC ENERGY-SPECTRUM ; WAVE-NUMBER SPECTRA ; GRAVITY-WAVES ; TRACE GASES ; TEMPERATURE ; CLIMATOLOGY ; FLOWS
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/29802
专题地球科学
作者单位McGill Univ, Montreal, PQ, Canada
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GB/T 7714
Asselin, Olivier,Bartello, Peter,Straub, David N.. On Boussinesq Dynamics near the Tropopause[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(2):571-585.
APA Asselin, Olivier,Bartello, Peter,&Straub, David N..(2018).On Boussinesq Dynamics near the Tropopause.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(2),571-585.
MLA Asselin, Olivier,et al."On Boussinesq Dynamics near the Tropopause".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.2(2018):571-585.
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