Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004-20, Revealed from Argo Observations

doi:10.1007/s00376-021-1358-6

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

	Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004-20, Revealed from Argo Observations
	Zhou, Guanghui 3,4,5; Zhang, Rong-Hua 1,2,3,4,5
刊名	ADVANCES IN ATMOSPHERIC SCIENCES
	2022-03-02
页码	14
关键词	isopycnal analysis spiciness anomalies subduction pathway advection role decadal variability North Pacific
ISSN号	0256-1530
DOI	10.1007/s00376-021-1358-6
通讯作者	Zhang, Rong-Hua(rzhang@qdio.ac.cn)
英文摘要	Ocean spiciness is referred to as density-compensated temperature and salinity variations with warm (cool) and salty (fresh) waters having high (low) spiciness, respectively. The structure and evolution of density-compensated (warm/salty or cool/fresh) spiciness anomalies are investigated in the North Pacific thermocline using Argo observations during the period 2004-20. Two well-organized decadal spiciness events are identified through isopycnal surface analyses. One warm/salty spiciness anomaly of about 0.15 degrees C and 0.05 g kg(-1) temperature and salinity perturbations on the 25 kg m(-3) isopycnal surface appeared in the eastern subtropical North Pacific at (18 degrees-30 degrees N, 120 degrees-150 degrees W) in 2007, which then migrated southwestward along the mean circulation and arrived in the western tropics at (similar to 15 degrees N, 145 degrees E-175 degrees W) in 2012-13, with the reduced salinity perturbation of about 0.043 g kg(-1). Another cool/fresh spiciness anomaly of about -0.2 degrees C and -0.07 g kg(-1) temperature and salinity perturbations originated from the eastern subtropics at (120 degrees-150 degrees W, similar to 30 degrees N) in 2014 and followed a similar advective pathway during the period from 2014-15 to 2019-20. The subduction pathway can be adequately determined by the mean Montgomery stream function on the isopycnal surface; the propagation direction and speed are in good agreement with the expectation for the role played by advection due to the mean geostrophic current. Moreover, the subducted decadal spiciness anomalies can have negative feedback on sea surface temperature (SST) variability in the western tropical Pacific through the diapycnal processes. The identifications of these density-compensated spiciness anomalies and their propagation pathways provide a clear illustration of the oceanic extratropics-tropics interactions in the North Pacific Ocean.
资助项目	National Natural Science Foundation of China [NSFC][41690122(41690120)] ; National Natural Science Foundation of China [NSFC][42030410] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 40000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 42000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19060102]
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000763272300002
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/178212]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Zhang, Rong-Hua
作者单位	1.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao 266237, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 5.Chinese Acad Sci, CAS Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Guanghui,Zhang, Rong-Hua. Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004-20, Revealed from Argo Observations[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2022:14.
APA	Zhou, Guanghui,&Zhang, Rong-Hua.(2022).Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004-20, Revealed from Argo Observations.ADVANCES IN ATMOSPHERIC SCIENCES,14.
MLA	Zhou, Guanghui,et al."Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004-20, Revealed from Argo Observations".ADVANCES IN ATMOSPHERIC SCIENCES (2022):14.