The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height

doi:10.1175/JPO-D-12-0106.1

IOCAS-IR > 海洋环流与波动重点实验室

	The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height
	Xu, Yongsheng 1; Fu, Lee-Lueng 2; Xu, YS (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China.
	2012-12-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	42 期号:12 页码:2229-2233
文章类型	Article
摘要	The wavenumber spectrum of sea surface height (SSH) observed by satellite altimetry was analyzed by Xu and Fu. The spectral shape in the wavelength range of 70-250 km was approximated by a power law, representing a regime governed by geostrophic turbulence theories. The effects of altimeter instrument noise were assumed insignificant at wavelengths longer than 70 km. The authors reexamined the assumption in the study. Using nearly simultaneous observations made by Jason-1 and Jason-2 during their cross-calibration phase, this study found that the white noise level of altimetry measurement was best estimated from the spectral values at wavelengths from 25 to 35 km. After removing a white noise level based on such estimate from the SSH spectrum, the spectral slope values changed significantly over most of the oceans. A key finding is that the spectral slopes are generally steeper than k(-2) (k is wavenumber) poleward of the 20 degrees latitudes, where flatter spectral slopes in some regions have previously caused problems for dynamic interpretations. The new results indicate that the spectral slopes in the core regions of the major ocean current systems have values between the original geostrophic turbulence theory and the surface quasigeostrophic theory. The near k(-4) spectrum suggests that the sea surface height variability at these wavelengths in the high eddy energy regions might be governed by frontogenesis.
学科领域	Oceanography
DOI	10.1175/JPO-D-12-0106.1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000313054800009
引用统计	被引频次：102[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/337002/12192
专题	海洋环流与波动重点实验室
通讯作者	Xu, YS (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.CALTECH, Jet Prop Lab, Pasadena, CA USA
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Xu, Yongsheng,Fu, Lee-Lueng,Xu, YS . The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2012,42(12):2229-2233.
APA	Xu, Yongsheng,Fu, Lee-Lueng,&Xu, YS .(2012).The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height.JOURNAL OF PHYSICAL OCEANOGRAPHY,42(12),2229-2233.
MLA	Xu, Yongsheng,et al."The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height".JOURNAL OF PHYSICAL OCEANOGRAPHY 42.12(2012):2229-2233.

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