Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific

doi:10.1007/s13131-015-0752-2

	Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific
	Feng Ying 1; Chen Xianyao 2; Wang Qin 3; Yuan Yeli 4
刊名	ACTA OCEANOLOGICA SINICA
	2015-11
卷号	34 期号:11 页码:92-101
关键词	mesoscale characteristics subsurface ocean Antarctic Intermediate Water (AAIW) Argo
ISSN号	0253-505X
DOI	10.1007/s13131-015-0752-2
英文摘要	The Argo float observations are used to investigate the mesoscale characteristics of the Antarctic Intermediate Water (AAIW) in the South Pacific in this paper. It is shown that a subsurface mesoscale phenomenon is probably touched by an Argo float during the float's ascent-descent cycles and is identified by the horizontal salinity gradient between the vertical temperature-salinity profiles. This shows that the transportation of the AAIW may be accompanied with the rich mesoscale characteristics. To derive the spatial length, time, and propagation characteristics of the mesoscale variability of the AAIW, the gridded temperature-salinity dataset ENACT/ENSEMBLE Version 3 constructed on the in-situ observations in the South Pacific since 2005 is used. The Empirical Mode Decomposition method is applied to decompose the isopycnal-averaged salinity anomaly from 26.8 sigma(theta)-27.4 sigma(theta), where the AAIW mainly resides, into the basin scale and two mesoscale modes. It is found that the first mesoscale mode with the length scale on the order of 1 000 km explains nearly 50% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speeds are slower in the mid-latitude (around 1 cm/s) and faster in the low latitude (around 6 cm/s), but with an increasing in the latitude band on 25 degrees-30 degrees S. The second mesoscale mode is of the length scale on the order of 500 km, explaining about 30% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speed keeps nearly unchanged (around 0.5 cm/s). These results presented the stronger turbulent motion of the subsurface ocean on the spatial scale, and also described the significant role of Argo program for the better understanding of the deep ocean.
资助项目	Basic Scientific Fund for National Public Research Institute of China[GY02-2012G25]
WOS关键词	NONSTATIONARY TIME-SERIES ; OCEANIC ROSSBY WAVES ; EDDIES ; TEMPERATURE ; VARIABILITY ; SEA ; DECOMPOSITION ; FLOATS ; NORTH ; RISE
WOS研究方向	Oceanography
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000362919700012
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25757]
专题	自然资源部第一海洋研究所
通讯作者	Feng Ying
作者单位	1.Xiamen Univ, Coll Ocean & Earth Sci, Xiamen 361002, Peoples R China 2.Ocean Univ China, Key Lab Physcial Oceanog, Qingdao 266100, Peoples R China 3.Marine Monitoring & Forecasting Ctr Zhejiang, Hangzhou 310007, Zhejiang, Peoples R China 4.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sci & Numer Modeling, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Feng Ying,Chen Xianyao,Wang Qin,et al. Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific[J]. ACTA OCEANOLOGICA SINICA,2015,34(11):92-101.
APA	Feng Ying,Chen Xianyao,Wang Qin,&Yuan Yeli.(2015).Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific.ACTA OCEANOLOGICA SINICA,34(11),92-101.
MLA	Feng Ying,et al."Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific".ACTA OCEANOLOGICA SINICA 34.11(2015):92-101.