Dynamics of intraseasonal sea level and thermocline variability in the equatorial Atlantic during 2002-03

doi:10.1175/2008JPO3854.1

IOCAS-IR > 海洋环流与波动重点实验室

	Dynamics of intraseasonal sea level and thermocline variability in the equatorial Atlantic during 2002-03
	Han, Weiqing 1; Webster, Peter J.2; Lin, Jia-Lin 3; Liu, W. T.2,4; Fu, Rong ; Yuan, Dongliang5 ; Hu, Aixue 6; Han, WQ, Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
	2008-05-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	38 期号:5 页码:945-967
文章类型	Article
摘要	Satellite and in situ observations in the equatorial Atlantic Ocean during 2002-03 show dominant spectral peaks at 40-60 days and secondary peaks at 10-40 days in sea level and thermocline within the intraseasonal period band (10-80 days). A detailed investigation of the dynamics of the intraseasonal variations is carried out using an ocean general circulation model, namely, the Hybrid Coordinate Ocean Model (HYCOM). Two parallel experiments are performed in the tropical Atlantic Ocean basin for the period 2000-03: one is forced by daily scatterometer winds from the Quick Scatterometer (QuikSCAT) satellite together with other forcing fields, and the other is forced by the low-passed 80-day version of the above fields. To help in understanding the role played by the wind-driven equatorial waves, a linear continuously stratified ocean model is also used.; Satellite and in situ observations in the equatorial Atlantic Ocean during 2002-03 show dominant spectral peaks at 40-60 days and secondary peaks at 10-40 days in sea level and thermocline within the intraseasonal period band (10-80 days). A detailed investigation of the dynamics of the intraseasonal variations is carried out using an ocean general circulation model, namely, the Hybrid Coordinate Ocean Model (HYCOM). Two parallel experiments are performed in the tropical Atlantic Ocean basin for the period 2000-03: one is forced by daily scatterometer winds from the Quick Scatterometer (QuikSCAT) satellite together with other forcing fields, and the other is forced by the low-passed 80-day version of the above fields. To help in understanding the role played by the wind-driven equatorial waves, a linear continuously stratified ocean model is also used. Within 3 degrees S-3 degrees N of the equatorial region, the strong 40-60-day sea surface height anomaly (SSHA) and thermocline variability result mainly from the first and second baroclinic modes equatorial Kelvin waves that are forced by intraseasonal zonal winds, with the second baroclinic mode playing a more important role. Sharp 40-50-day peaks of zonal and meridional winds appear in both the QuikSCAT and Pilot Research Moored Array in the Tropical Atlantic (PIRATA) data for the period 2002-03, and they are especially strong in 2002. Zonal wind anomaly in the central-western equatorial basin for the period 2000-06 is significantly correlated with SSHA across the equatorial basin, with simultaneous/ lag correlation ranging from-0.62 to 0.74 above 95% significance. Away from the equator (3 degrees-5 degrees N), however, sea level and thermocline variations in the 40-60-day band are caused largely by tropical instability waves (TIWs). On 10-40-day time scales and west of 10 degrees W, the spectral power of sea level and thermocline appears to be dominated by TIWs within 5 degrees S-5 degrees N of the equatorial region. The wind-driven circulation, however, also provides a significant contribution. Interestingly, east of 10 W, SSHA and thermocline variations at 10 40- day periods result almost entirely from wind-driven equatorial waves. During the boreal spring of 2002 when TIWs are weak, Kelvin waves dominate the SSHA across the equatorial basin (2 degrees S-2 degrees N). The observed quasi-biweekly Yanai waves are excited mainly by the quasi-biweekly meridional winds, and they contribute significantly to the SSHA and thermocline variations in 1 degrees-5 degrees N and 1 degrees-5 degrees S regions.
关键词	Tropical Instability Waves West-african Monsoon Indian-ocean Long Waves Numerical-model Pacific-ocean Kelvin Waves Current Oscillations Surface Temperature Rossby Waves
学科领域	Oceanography
DOI	10.1175/2008JPO3854.1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000255954700002
引用统计	被引频次：39[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/337002/1759
专题	海洋环流与波动重点实验室
通讯作者	Han, WQ, Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
作者单位	1.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA 2.Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA 3.Ohio State Univ, Dept Geog, Columbus, OH 43210 USA 4.CALTECH, Jet Propuls Lab, Pasadena, CA 91125 USA 5.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 6.Natl Ctr Atmospher Res, Boulder, CO 80307 USA
推荐引用方式 GB/T 7714	Han, Weiqing,Webster, Peter J.,Lin, Jia-Lin,et al. Dynamics of intraseasonal sea level and thermocline variability in the equatorial Atlantic during 2002-03[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2008,38(5):945-967.
APA	Han, Weiqing.,Webster, Peter J..,Lin, Jia-Lin.,Liu, W. T..,Fu, Rong.,...&Han, WQ, Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA.(2008).Dynamics of intraseasonal sea level and thermocline variability in the equatorial Atlantic during 2002-03.JOURNAL OF PHYSICAL OCEANOGRAPHY,38(5),945-967.
MLA	Han, Weiqing,et al."Dynamics of intraseasonal sea level and thermocline variability in the equatorial Atlantic during 2002-03".JOURNAL OF PHYSICAL OCEANOGRAPHY 38.5(2008):945-967.

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