A Frequency-Dependent Description of Propagating Sea Level Signals in the Kuroshio Extension Region

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	A Frequency-Dependent Description of Propagating Sea Level Signals in the Kuroshio Extension Region
	Lin, Hongyang ; Thompson, Keith R. ; Hu, Jianyu ; Hu JY(胡建宇)
刊名	http://dx.doi.org/10.1175/JPO-D-13-0185.1
	2014
关键词	DRIVEN OCEAN CIRCULATION NORTH PACIFIC-OCEAN LARGE-SCALE GEOSAT ALTIMETRY CURRENT SYSTEM ROSSBY WAVES DECADAL VARIABILITY RECIRCULATION GYRE TIME SCALES MEAN FLOW
英文摘要	National Basic Research Program of China [2012CB417402]; National Natural Science Foundation of China [41276006]; Natural Sciences and Engineering Research Council of Canada; China Scholarship Council; Hilbert empirical orthogonal function analysis is used to provide a frequency-dependent description of observed sea level variability in the Kuroshio Extension region, 1993-2012 inclusive. The dominant high-frequency mode (periods between 140 and 350 days) describes signals that propagate westward with the largest amplitudes in the vicinity of the Shatsky Rise and Emperor Seamounts. Based on the close correspondence between the variance of the high-frequency variability and the underlying bathymetry, it is speculated that this mode is driven by jet bathymetry interactions. The dominant low-frequency mode (periods longer than 350 days) is explained in terms of wind-forced, jet-trapped Rossby waves that propagate along the mean Kuroshio Extension jet. One of the most surprising findings of this study is that sea level changes north of the jet in the meander region anticipate changes south of the jet by about 3 yr. Based on correlations of observed sea level with the Pacific decadal oscillation, and western boundary transport variability estimated from the Global Ocean Reanalysis and Simulations (GLORYS), it is speculated that this anticipation is due to the differences in time taken for (i) Rossby waves to travel from the eastern North Pacific to the meander region and (ii) the much faster barotropic response of western boundary transport, and sea level north of the jet, to large-scale forcing by the wind stress curl.
语种	英语
出版者	AMER METEOROLOGICAL SOC
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88120]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Lin, Hongyang,Thompson, Keith R.,Hu, Jianyu,et al. A Frequency-Dependent Description of Propagating Sea Level Signals in the Kuroshio Extension Region[J]. http://dx.doi.org/10.1175/JPO-D-13-0185.1,2014.
APA	Lin, Hongyang,Thompson, Keith R.,Hu, Jianyu,&胡建宇.(2014).A Frequency-Dependent Description of Propagating Sea Level Signals in the Kuroshio Extension Region.http://dx.doi.org/10.1175/JPO-D-13-0185.1.
MLA	Lin, Hongyang,et al."A Frequency-Dependent Description of Propagating Sea Level Signals in the Kuroshio Extension Region".http://dx.doi.org/10.1175/JPO-D-13-0185.1 (2014).