GSTDTAP
DOI10.1175/JAS-D-18-0261.1
Climatological Features of the Weakly and Very Stably Stratified Nocturnal Boundary Layers. Part I: State Variables Containing Information about Regime Occupation
Abraham, Carsten; Monahan, Adam H.
2019-11-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2019
卷号76期号:11页码:3455-3484
文章类型Article
语种英语
国家Canada
英文摘要

The atmospheric nocturnal stable boundary layer (SBL) can be classified into two distinct regimes: the weakly SBL (wSBL) with sustained turbulence and the very SBL (vSBL) with weak and intermittent turbulence. A hidden Markov model (HMM) analysis of the three-dimensional state-variable space of Reynolds-averaged mean dry static stability, mean wind speed, and wind speed shear is used to classify the SBL into these two regimes at nine different tower sites, in order to study long-term regime occupation and transition statistics. Both Reynolds-averaged mean data and measures of turbulence intensity (eddy variances) are separated in a physically meaningful way. In particular, fluctuations of the vertical wind component are found to be much smaller in the vSBL than in the wSBL. HMM analyses of these data using more than two SBL regimes do not result in robust results across measurement locations. To identify which meteorological state variables carry the information about regime occupation, the HMM analyses are repeated using different state-variable subsets. Reynolds-averaged measures of turbulence intensity (such as turbulence kinetic energy) at any observed altitude hold almost the same information as the original set, without adding any additional information. In contrast, both stratification and shear depend on surface information to capture regime transitions accurately. Use of information only in the bottom 10 m of the atmosphere is sufficient for HMM analyses to capture important information about regime occupation and transition statistics. It follows that the commonly measured 10-m wind speed is potentially a good indicator of regime occupation.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000494454100001
WOS关键词PROBABILITY-DISTRIBUTION ; WIND-SPEED ; INTERMITTENT TURBULENCE ; DOME C ; SIMILARITY THEORY ; DIURNAL CYCLES ; CLEAR-SKY ; MODELS ; LEVEL ; SHEAR
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/225991
专题环境与发展全球科技态势
作者单位Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC, Canada
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GB/T 7714
Abraham, Carsten,Monahan, Adam H.. Climatological Features of the Weakly and Very Stably Stratified Nocturnal Boundary Layers. Part I: State Variables Containing Information about Regime Occupation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(11):3455-3484.
APA Abraham, Carsten,&Monahan, Adam H..(2019).Climatological Features of the Weakly and Very Stably Stratified Nocturnal Boundary Layers. Part I: State Variables Containing Information about Regime Occupation.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(11),3455-3484.
MLA Abraham, Carsten,et al."Climatological Features of the Weakly and Very Stably Stratified Nocturnal Boundary Layers. Part I: State Variables Containing Information about Regime Occupation".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.11(2019):3455-3484.
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