Baroclinic Rossby Waves With Phase Lag Cause Seasonal Upward-Propagating Signals in the Mid-Depth Equatorial Pacific Ocean

doi:10.1029/2023JC020418

IOCAS-IR > 海洋环流与波动重点实验室

	Baroclinic Rossby Waves With Phase Lag Cause Seasonal Upward-Propagating Signals in the Mid-Depth Equatorial Pacific Ocean
	Luo, Zhengpu 1,2,3,4,5,6; Yang, Dezhou 1,2,3,4,5,6; Xu, Lingjing 1,2,3,4,5,6; Li, Yuxuan 1,2,3,4,5,6; Zhang, Hang 1,2,6; Wang, Jianing1,2,6 ; Yin, Baoshu 1,2,3,4,5,6
	2024-05-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	129 期号:5 页码:16
通讯作者	Yang, Dezhou(yangdezhou@qdio.ac.cn)
摘要	Based on OFES outputs verified by mooring observations, the seasonal characteristics in the middepth (1,000-3,000 m) equatorial Pacific Ocean are investigated in detail. The seasonal upward-propagating signals, consisting of one positive and one negative anomaly, are identified at the equator. The harmonic analyses indicate that the seasonal variations in the middepth equatorial Pacific Ocean originate from the downward-propagating energy dominated by the first meridional modes of Rossby waves. The superposition of first and second baroclinic modes of Rossby waves could reproduce the seasonal variations. Furthermore, a series of superposition experiments show that the phase lag between the two modes needs to be in the range of 0 to pi to cause upward phase propagation. It implies that the baroclinic modes in the seasonal variations may not be generated simultaneously so that the Rossby waves with specific phase lag can cause upward-propagating signals in the middepth equatorial Pacific Ocean. This new finding will enhance the understanding of seasonal variations in the middepth equatorial Pacific Ocean. Seasonal upward-propagating signals are identified in both mooring observations and OFES outputs, which are necessary to understand the seasonal variations in the middepth (1,000-3,000 m) equatorial Pacific Ocean. The energy of seasonal variations originates from the vertical propagation of the first meridional mode Rossby wave. Furthermore, the seasonal upward phase propagation is caused by the superposition of the first and second baroclinic Rossby waves. However, the phase lags between 2 modes affect the results of mode superposition. A series of superposition experiments show that downward seasonal signals occur when the phase lag is between pi and 2 pi. In contrast, upward signals occur when the phase lag is between 0 and pi, and the phase lag should have been approximately pi 2 $\frac{\pi }{2}$ to result in smooth phase lines such as the natural ones. The results imply that the baroclinic modes in the seasonal variations may not be generated simultaneously. That is a new perspective that contributes to the understanding of seasonal variations in the middepth equatorial Pacific Ocean. The seasonal upward-propagating signals in the middepth equatorial Pacific are identified in mooring observations The seasonal variations are caused by the first meridional mode and the first 2 baroclinic modes of Rossby waves The phase lag between the first 2 baroclinic modes that dominate the seasonal variations should be in the range of 0 to pi, close to pi 2 $\frac{\pi }{2}$
DOI	10.1029/2023JC020418
收录类别	SCI
语种	英语
资助项目	Laoshan Laboratory[LSKJ2022020103] ; Laoshan Laboratory (Qingdao)[XDB42000000] ; Laoshan Laboratory (Qingdao)[LSKJ202202504] ; Strategic Priority Research Program of the Chinese Academy of Sciences[92158202] ; National Natural Science Foundation of China ; High Performance Computing Center at the IOCAS
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001210869000001
出版者	AMER GEOPHYSICAL UNION
WOS关键词	TROPICAL PACIFIC ; ZONAL CURRENTS ; MODEL ; CIRCULATION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/185614
专题	海洋环流与波动重点实验室海洋生态与环境科学重点实验室
通讯作者	Yang, Dezhou
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, CAS Engn Lab Marine Ranching, Qingdao, Peoples R China 6.Univ Chinese Acad Sci, Beijing, Peoples R China
第一作者单位	中国科学院海洋研究所; 海洋环流与波动重点实验室
通讯作者单位	中国科学院海洋研究所; 海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Luo, Zhengpu,Yang, Dezhou,Xu, Lingjing,et al. Baroclinic Rossby Waves With Phase Lag Cause Seasonal Upward-Propagating Signals in the Mid-Depth Equatorial Pacific Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2024,129(5):16.
APA	Luo, Zhengpu.,Yang, Dezhou.,Xu, Lingjing.,Li, Yuxuan.,Zhang, Hang.,...&Yin, Baoshu.(2024).Baroclinic Rossby Waves With Phase Lag Cause Seasonal Upward-Propagating Signals in the Mid-Depth Equatorial Pacific Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(5),16.
MLA	Luo, Zhengpu,et al."Baroclinic Rossby Waves With Phase Lag Cause Seasonal Upward-Propagating Signals in the Mid-Depth Equatorial Pacific Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.5(2024):16.