Effects of tropical instability wave (TIW)-induced surface wind feedback in the tropical Pacific Ocean

doi:10.1007/s00382-013-1878-6

IOCAS-IR > 海洋环流与波动重点实验室

	Effects of tropical instability wave (TIW)-induced surface wind feedback in the tropical Pacific Ocean
	Zhang, Rong-Hua1,2
	2014
发表期刊	CLIMATE DYNAMICS
卷号	42 期号:1-2 页码:467-485
文章类型	Article
摘要	Tropical instability waves (TIWs) arise from oceanic instability in the eastern tropical Pacific and Atlantic Oceans, having a clear atmospheric signature that results in coupled atmosphere-ocean interactions at TIW scales. In this study, the extent to which TIW-induced surface wind feedback influences the ocean is examined using an ocean general circulation model (OGCM). The TIW-induced wind stress (tau(TIW)) part is diagnostically determined using an empirical tau(TIW) model from sea surface temperature (SST) fields simulated in the OGCM. The interactively represented TIW wind tends to reduce TIW activity in the ocean and influence the mean state, with largest impacts during TIW active periods in fall and winter. In December, the interactive tau(TIW) forcing induces a surface cooling (an order of -0.1 to -0.3 A degrees C), an increased heat flux into the ocean, a shallower mixed layer and a weakening of the South Equatorial Current in the eastern equatorial Pacific. Additionally, the TIW wind effect yields a pronounced latitudinal asymmetry of sea level field across the equator, and a change to upper thermal structure, characterized by a surface cooling and a warming below in the thermocline, leading to a decreased temperature gradient between the mixed layer and the thermocline. Processes responsible for the tau(TIW)-induced cooling effects are analyzed. Vertical mixing and meridional advection are the two terms in the SST budget that are dominantly affected by the TIW wind feedback: the cooling effect from the vertical mixing on SST is enhanced, with the maximum induced cooling in winter; the warming effect from the meridional advection is reduced in July-October, but enhanced in November-December. Additional experiments are performed to separate the relative roles the affected surface momentum and heat fluxes play in the cooling effect on SST. This ocean-only modeling work indicates that the effect of TIW-induced wind feedback is small but not negligible, and may need to be adequately taken into account in large-scale climate modeling.; Tropical instability waves (TIWs) arise from oceanic instability in the eastern tropical Pacific and Atlantic Oceans, having a clear atmospheric signature that results in coupled atmosphere-ocean interactions at TIW scales. In this study, the extent to which TIW-induced surface wind feedback influences the ocean is examined using an ocean general circulation model (OGCM). The TIW-induced wind stress (tau(TIW)) part is diagnostically determined using an empirical tau(TIW) model from sea surface temperature (SST) fields simulated in the OGCM. The interactively represented TIW wind tends to reduce TIW activity in the ocean and influence the mean state, with largest impacts during TIW active periods in fall and winter. In December, the interactive tau(TIW) forcing induces a surface cooling (an order of -0.1 to -0.3 A degrees C), an increased heat flux into the ocean, a shallower mixed layer and a weakening of the South Equatorial Current in the eastern equatorial Pacific. Additionally, the TIW wind effect yields a pronounced latitudinal asymmetry of sea level field across the equator, and a change to upper thermal structure, characterized by a surface cooling and a warming below in the thermocline, leading to a decreased temperature gradient between the mixed layer and the thermocline. Processes responsible for the tau(TIW)-induced cooling effects are analyzed. Vertical mixing and meridional advection are the two terms in the SST budget that are dominantly affected by the TIW wind feedback: the cooling effect from the vertical mixing on SST is enhanced, with the maximum induced cooling in winter; the warming effect from the meridional advection is reduced in July-October, but enhanced in November-December. Additional experiments are performed to separate the relative roles the affected surface momentum and heat fluxes play in the cooling effect on SST. This ocean-only modeling work indicates that the effect of TIW-induced wind feedback is small but not negligible, and may need to be adequately taken into account in large-scale climate modeling.
关键词	Eastern Equatorial Pacific Numerical Weather Prediction General-circulation Model Mixed-layer Model Fresh-water Flux El-nino Satellite Measurements Southern Oscillation Atmospheric Response Heat-budget
DOI	10.1007/s00382-013-1878-6
收录类别	SCI
语种	英语
WOS记录号	WOS:000329238300028
引用统计	被引频次：27[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/337002/18192
专题	海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 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	Zhang, Rong-Hua. Effects of tropical instability wave (TIW)-induced surface wind feedback in the tropical Pacific Ocean[J]. CLIMATE DYNAMICS,2014,42(1-2):467-485.
APA	Zhang, Rong-Hua.(2014).Effects of tropical instability wave (TIW)-induced surface wind feedback in the tropical Pacific Ocean.CLIMATE DYNAMICS,42(1-2),467-485.
MLA	Zhang, Rong-Hua."Effects of tropical instability wave (TIW)-induced surface wind feedback in the tropical Pacific Ocean".CLIMATE DYNAMICS 42.1-2(2014):467-485.

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