Equivalent-barotropic definition of tropospheric mean temperature

IOCAS-IR > 海洋环流与波动重点实验室

	Equivalent-barotropic definition of tropospheric mean temperature
	Sun, C
	2005-09-01
发表期刊	JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN	0022-4928
卷号	62 期号:9 页码:3172-3192
文章类型	Article
摘要	An equivalent-barotropic (EB) description of the tropospheric temperature field is derived from the geostrophic empirical mode (GEM) in the form of a scalar function Gamma(p, phi), where p is pressure and phi is 300-850-mb thickness. Baroclinic parameter phi plays the role of latitude at each longitudinal section. Compared with traditional Eulerian-mean methods, GEM defines a mean field in baroclinic streamfunction space with a time scale much longer than synoptic variability. It prompts an EB concept that is only based on a baroclinic field.; An equivalent-barotropic (EB) description of the tropospheric temperature field is derived from the geostrophic empirical mode (GEM) in the form of a scalar function Gamma(p, phi), where p is pressure and phi is 300-850-mb thickness. Baroclinic parameter phi plays the role of latitude at each longitudinal section. Compared with traditional Eulerian-mean methods, GEM defines a mean field in baroclinic streamfunction space with a time scale much longer than synoptic variability. It prompts an EB concept that is only based on a baroclinic field. Monthly GEM fields are diagnosed from NCEP-NCAR reanalysis data and account for more than 90% of the tropospheric thermal variance. The circumglobal composite of GEM fields exhibits seasonal, zonal, and hemispheric asymmetries, with larger rms errors occurring in winter and in the Northern Hemisphere (NH). Zonally asymmetric features and planetary deviation from EB are seen in the NH winter GEM. Reconstruction of synoptic sections and correlation analysis reveal that the tropospheric temperature field is EB at the leading order and has a 1-day phase lag behind barotropic variations in extratropical regions.
关键词	Antarctic Circumpolar Current Gravest Empirical Mode Disturbances Circulation
学科领域	Meteorology & Atmospheric Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000232275300010
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2452
专题	海洋环流与波动重点实验室
作者单位	Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Sun, C. Equivalent-barotropic definition of tropospheric mean temperature[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2005,62(9):3172-3192.
APA	Sun, C.(2005).Equivalent-barotropic definition of tropospheric mean temperature.JOURNAL OF THE ATMOSPHERIC SCIENCES,62(9),3172-3192.
MLA	Sun, C."Equivalent-barotropic definition of tropospheric mean temperature".JOURNAL OF THE ATMOSPHERIC SCIENCES 62.9(2005):3172-3192.

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