气候变化领域集成服务门户(CCPortal): Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau

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DOI	10.1007/s10546-006-9096-y
	Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau
	Asanuma, Jun; Tamagawa, Ichiro; Ishikawa, Hirohiko; Ma, Yaoming; Hayashi, Taiichi; Qi, Yongqiang; Wang, Jiemin
发表日期	2007
ISSN	0006-8314
起始页码	85
结束页码	103
卷号	122 期号:1
英文摘要	Similarity between temperature and water vapour was investigated in the Fourier domain by using their coherency spectra, defined as the correlation coefficient between their Fourier modes, and the relative efficiency of their vertical transport. The class-averaged values of these indices were computed from the turbulence measurements over sparse grasslands on the Tibetan plateau during the intensive observations of GEWEX (Global Energy and Water Experiment) Asian Monsoon Experiment (GAME). It was found that the energy-containing eddies at scales up to 100z (z being height) are characterised by well-maintained similarity between these scalars. The scalars are highly correlated with each other, and their transport efficiencies are almost equal within this scale range. In contrast, similarity was not always maintained at scales larger than 1000z. Detailed analyses showed that this breakdown of similarity occurs occasionally or sporadically, suggesting that it is caused by events whose average return period is not much smaller than the current averaging time, i.e. 30 min. We speculate that entrainment of drier and warmer air at the top of the atmospheric boundary layer caused the scalar dissimilarity at this scale range.
关键词	CONVECTIVE BOUNDARY-LAYER FLUX-VARIANCE METHOD BOTTOM-UP DIFFUSION WATER-VAPOR DIFFERENTIAL DIFFUSION SENSIBLE HEAT HUMIDITY FLUCTUATIONS PASSIVE SCALARS TRANSFER-COEFFICIENTS ISOTROPIC TURBULENCE
英文关键词	energy-containing range; entrainment; evaporation; land-atmosphere interaction; sensible heat flux
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000243448400006
来源期刊	BOUNDARY-LAYER METEOROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257522
推荐引用方式 GB/T 7714	Asanuma, Jun,Tamagawa, Ichiro,Ishikawa, Hirohiko,et al. Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau[J]. 中国科学院青藏高原研究所,2007,122(1).
APA	Asanuma, Jun.,Tamagawa, Ichiro.,Ishikawa, Hirohiko.,Ma, Yaoming.,Hayashi, Taiichi.,...&Wang, Jiemin.(2007).Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau.BOUNDARY-LAYER METEOROLOGY,122(1).
MLA	Asanuma, Jun,et al."Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau".BOUNDARY-LAYER METEOROLOGY 122.1(2007).