Turbulent diapycnal mixing in the subtropical northwestern Pacific: Spatial-seasonal variations and role of eddies

doi:10.1029/2011JC007142

IOCAS-IR > 海洋环流与波动重点实验室

	Turbulent diapycnal mixing in the subtropical northwestern Pacific: Spatial-seasonal variations and role of eddies
	Jing, Zhao 1; Wu, Lixin 1; Li, Lei 1; Liu, Chengyan 1; Liang, Xi 1; Chen, Zhaohui 1; Hu, Dunxin 2; Liu, Qingyu 1
	2011-10-19
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	0148-0227
卷号	116 页码:C10028
文章类型	Article
摘要	Both spatial and seasonal variation of turbulent diapycnal mixing in the subtropical northwestern Pacific are evaluated by employing a fine-scale parameterization method based on profiles of potential density, which are obtained from CTD measurements during our recent hydrographic surveys implemented by the China National Key Basic Research Project from 2008 to 2010 and the World Ocean Circulation Experiment. Over smooth seafloor, the value of diffusivity away from the boundary is comparable with the values observed in the stratified midlatitude ocean interior, i.e., O (10(-5) m(2) s(-1)). On the other hand, enhanced diapycnal mixing, i.e., O (10(-4) m(2) s(-1)) or larger has been found over rough topography such as the Central Basin Trough, Okidaito Ridge, the origin of the Kuroshio Current, and especially Luzon Strait, which might result from dissipation of baroclinic energy generated when barotropic tides rub over rough topography. Over flat bathymetry, mixing is probably stirred by the wind work on near inertial motions in the upper 600 m and enhanced downward propagating energy has been found in the presence of anticyclonic eddies, which points to the important role of anticyclonic eddies in enhancing the diapycnal mixing at greater depth. The diffusivity also displays a distinct seasonal variation with strong (weak) mixing corresponding to strong (weak) wind-input energy in winter (summer), which, however, is only confined to upper 600 m. This is different from the midlatitude northwestern Pacific, where seasonality of diffusivity can be found at 1500-m depth.; Both spatial and seasonal variation of turbulent diapycnal mixing in the subtropical northwestern Pacific are evaluated by employing a fine-scale parameterization method based on profiles of potential density, which are obtained from CTD measurements during our recent hydrographic surveys implemented by the China National Key Basic Research Project from 2008 to 2010 and the World Ocean Circulation Experiment. Over smooth seafloor, the value of diffusivity away from the boundary is comparable with the values observed in the stratified midlatitude ocean interior, i.e., O (10(-5) m(2) s(-1)). On the other hand, enhanced diapycnal mixing, i.e., O (10(-4) m(2) s(-1)) or larger has been found over rough topography such as the Central Basin Trough, Okidaito Ridge, the origin of the Kuroshio Current, and especially Luzon Strait, which might result from dissipation of baroclinic energy generated when barotropic tides rub over rough topography. Over flat bathymetry, mixing is probably stirred by the wind work on near inertial motions in the upper 600 m and enhanced downward propagating energy has been found in the presence of anticyclonic eddies, which points to the important role of anticyclonic eddies in enhancing the diapycnal mixing at greater depth. The diffusivity also displays a distinct seasonal variation with strong (weak) mixing corresponding to strong (weak) wind-input energy in winter (summer), which, however, is only confined to upper 600 m. This is different from the midlatitude northwestern Pacific, where seasonality of diffusivity can be found at 1500-m depth.
学科领域	Oceanography
DOI	10.1029/2011JC007142
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000296161700001
引用统计	被引频次：37[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/337002/11619
专题	海洋环流与波动重点实验室
作者单位	1.Ocean Univ China, Phys Oceanog Lab, Qingdao 266100, Peoples R China 2.Chinese Acad Sci, Key Lab Ocean Circulat & Wave, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Jing, Zhao,Wu, Lixin,Li, Lei,et al. Turbulent diapycnal mixing in the subtropical northwestern Pacific: Spatial-seasonal variations and role of eddies[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2011,116:C10028.
APA	Jing, Zhao.,Wu, Lixin.,Li, Lei.,Liu, Chengyan.,Liang, Xi.,...&Liu, Qingyu.(2011).Turbulent diapycnal mixing in the subtropical northwestern Pacific: Spatial-seasonal variations and role of eddies.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,116,C10028.
MLA	Jing, Zhao,et al."Turbulent diapycnal mixing in the subtropical northwestern Pacific: Spatial-seasonal variations and role of eddies".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 116(2011):C10028.

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