Intraseasonal Variability of the Surface Zonal Currents in the Western Tropical Pacific Ocean: Characteristics and Mechanisms

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Intraseasonal Variability of the Surface Zonal Currents in the Western Tropical Pacific Ocean: Characteristics and Mechanisms
	Wang, Fan1 ; Li, Yuanlong 2; Wang, Jianing1
刊名	JOURNAL OF PHYSICAL OCEANOGRAPHY
	2016-12-01
卷号	46 期号:12 页码:3639-3660
英文摘要	The surface circulation of the tropical Pacific Ocean is characterized by alternating zonal currents, such as the North Equatorial Current (NEC), North Equatorial Countercurrent (NECC), South Equatorial Current (SEC), and South Equatorial Countercurrent (SECC). In situ measurements of subsurface moorings and satellite observations reveal pronounced intraseasonal variability (ISV; 20-90 days) of these zonal currents in the western tropical Pacific Ocean (WTPO). The amplitude of ISV is the largest within the equatorial band exceeding 20 cm s(-1) and decreases to similar to 10 cm s(-1) in the NECC band and further to 4-8 cm s(-1) in the NEC and SECC. The ISV power generally increases from high frequencies to low frequencies and exhibits a peak at 50-60 days in the NECC, SEC, and SECC. These variations are faithfully reproduced by an ocean general circulation model (OGCM) forced by satellite winds, and parallel model experiments are performed to gain insights into the underlying mechanisms. It is found that large-scale ISV (>500 km) is primarily caused by atmospheric intraseasonal oscillations (ISOs), such as the Madden-Julian oscillation (MJO), through wind stress forcing. These signals are confined within 10 degrees S-8 degrees N, mainly as baroclinic ocean wave responses to ISO winds. For scales shorter than 200 km, ISV is dominated by ocean internal variabilities with mesoscale structures. They arise from the baroclinic and barotropic instabilities associated with the vertical and horizontal shears of the upper-ocean circulation. The ISV exhibits evident seasonal variation, with larger (smaller) amplitude in boreal winter (summer) in the SEC and SECC.
收录类别	SCI
语种	英语
WOS记录号	WOS:000391349300009
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/136272]
专题	海洋研究所_海洋环流与波动重点实验室海洋研究所_实验海洋生物学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China 2.Univ Colorado Boulder, Dept Atmospher & Ocean Sci, Boulder, CO USA
推荐引用方式 GB/T 7714	Wang, Fan,Li, Yuanlong,Wang, Jianing. Intraseasonal Variability of the Surface Zonal Currents in the Western Tropical Pacific Ocean: Characteristics and Mechanisms[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2016,46(12):3639-3660.
APA	Wang, Fan,Li, Yuanlong,&Wang, Jianing.(2016).Intraseasonal Variability of the Surface Zonal Currents in the Western Tropical Pacific Ocean: Characteristics and Mechanisms.JOURNAL OF PHYSICAL OCEANOGRAPHY,46(12),3639-3660.
MLA	Wang, Fan,et al."Intraseasonal Variability of the Surface Zonal Currents in the Western Tropical Pacific Ocean: Characteristics and Mechanisms".JOURNAL OF PHYSICAL OCEANOGRAPHY 46.12(2016):3639-3660.