A three-dimensional gravest empirical mode determined from hydrographic observations in the western equatorial Pacific Ocean

doi:10.1016/j.jmarsys.2020.103487

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

	A three-dimensional gravest empirical mode determined from hydrographic observations in the western equatorial Pacific Ocean
	Liu, Hengchang 1,5,6; Zhou, Hui 1,4,5,6; Yang, Wenlong 1,5,6; Liu, Xueqi 1,5,6; Li, Yao 4,5,6; Yang, Ya 1,5,6; Chen, Xu 2,3; Li, Xiaofeng 1,4,5,6
刊名	JOURNAL OF MARINE SYSTEMS
	2021-02-01
卷号	214 页码:19
关键词	Nascent NECC Volume transport PIES Non-stationary gravest empirical mode El Nino
ISSN号	0924-7963
DOI	10.1016/j.jmarsys.2020.103487
通讯作者	Zhou, Hui(zhouhui@qdio.ac.cn)
英文摘要	A spatially varying non-stationary gravest empirical mode (GEM) field is constructed by incorporating the calendar month as an extra parameter to infer the subsurface thermohaline structure from the Pressure-sensor equipped Inverted Echo Sounder (PIES) observations in the western equatorial Pacific Ocean. This monthly GEM (MGEM) overcomes the application limitation of traditional GEM in the equatorial ocean due to the poor vertical coherence thermohaline structure there. The MGEM can capture 77% of the thermohaline variance for the upper 500 dbar, which is only 62% by the traditional GEM method. The most significant improvement of MGEM is for the deep ocean between 500 and 1900 dbar, where only 12% of the thermohaline variance can be captured by the GEM, but improved to 44% by the MGEM method. Based on the MGEM, a 24-month volume transport time series is estimated from observations by three PIESs deployed across the nascent North Equatorial Countercurrent (NECC) at 4 degrees N, 6 degrees N, and 8 degrees N along the 130 degrees E transect during 2014-2016. By establishing an empirical relationship between the 24 month-long volume transport and the synchronous altimeter data, a 24 year-long time series of NECC volume transport during 1993-2016 are constructed, and the seasonal and interannual variations of the NECC are investigated. The nascent NECC between 4 degrees N-6 degrees N was found to have quite strong seasonal variations with the strongest transport of 23 Sv occurring in February and the weakest transport of 11 Sv occurring in September. It is strengthened during the developing phase of El Ninos, and is weakened during La Ninas. The 2015/16 El Nino exerts a significant impact on the nascent NECC with the amplitude comparable to that of the 1997/98 event, which even obscures the NECC's seasonality.
资助项目	NSFC[41876009] ; NSFC[41549909] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; QMSNL[2016ASKJ12] ; QMSNL[2016ASKJ04] ; Hundred-Talent Program of the Chinese Academy of Sciences[Y9KY0410L] ; National Basic Research Program of China[2012CB956000]
WOS研究方向	Geology ; Marine & Freshwater Biology ; Oceanography
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000600370000001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/169908]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Zhou, Hui
作者单位	1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Florida State Univ, Dept Ocean Atmosphere & Earth Sci, Tallahassee, FL 32306 USA 3.Florida A&M Univ, Tallahassee, FL USA 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 5.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Peoples R China 6.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hengchang,Zhou, Hui,Yang, Wenlong,et al. A three-dimensional gravest empirical mode determined from hydrographic observations in the western equatorial Pacific Ocean[J]. JOURNAL OF MARINE SYSTEMS,2021,214:19.
APA	Liu, Hengchang.,Zhou, Hui.,Yang, Wenlong.,Liu, Xueqi.,Li, Yao.,...&Li, Xiaofeng.(2021).A three-dimensional gravest empirical mode determined from hydrographic observations in the western equatorial Pacific Ocean.JOURNAL OF MARINE SYSTEMS,214,19.
MLA	Liu, Hengchang,et al."A three-dimensional gravest empirical mode determined from hydrographic observations in the western equatorial Pacific Ocean".JOURNAL OF MARINE SYSTEMS 214(2021):19.