Reduction of Equatorial Obduction by Atmospheric Intraseasonal Oscillations in the Western and Central Pacific Ocean

doi:10.1029/2021JC017901

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

	Reduction of Equatorial Obduction by Atmospheric Intraseasonal Oscillations in the Western and Central Pacific Ocean
	Liu, Lingling 2,3; Li, Yuanlong 1,2,3; Wang, Fan 2,3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2022-05-01
卷号	127 期号:5 页码:19
关键词	atmospheric intraseasonal oscillation obduction western and central equatorial Pacific Ocean mixed layer depth intraseasonal variability
ISSN号	2169-9275
DOI	10.1029/2021JC017901
通讯作者	Li, Yuanlong(liyuanlong@qdio.ac.cn)
英文摘要	Obduction is the large-scale, irreversible upward water transport from the permanent pycnocline to the surface mixed layer. Using Hybrid Coordinate Ocean Model (HYCOM), this study explores the impact of atmospheric intraseasonal oscillations (ISOs) on the Pacific equatorial obduction that plays a fundamental role in regulating the tropical Pacific climate. Parallel HYCOM experiments forced by atmospheric fields with and without ISO variability are compared to assess the effect of ISOs on the ocean. The results suggest that the ISOs can reduce the annual obduction rate of the western and central equatorial Pacific Ocean (WCEPO; 150 degrees E-160 degrees W, 5 degrees S-5 degrees N) by similar to 12%, and their impact on the eastern Pacific is rather limited. The ISOs cause prominent intraseasonal variability of mixed layer depth (MLD) in the WCEPO primarily through surface wind forcing, which in turn affects the two key processes controlling the annual obduction rate. First, the intraseasonal MLD deepening events narrow down the total time windows for obduction by similar to 30% and thereby give rise to the decrease in obduction rate; second, it leads to high-frequency entrainment events and enhances the entrainment rate by similar to 18%. The increased entrainment rate is overwhelmed by the reduced time windows for effective entrainment, and the net effect of ISOs is to reduce the obduction rate and modify its seasonal cycle. This work highlights the importance of atmospheric ISOs in the equatorial ocean dynamics, with implications for tropical surface temperature and climate variabilities and biogeochemical cycle.
资助项目	National Natural Science Foundation of China[41976009] ; National Key Research and Development Program of China[2019YFA0606702] ; Shandong Provincial Natural Science Foundation[ZR2020JQ17] ; Key Deployment Project of CAS Centre for Ocean Mega-Science[COMS2019Q07]
WOS研究方向	Oceanography
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000797197400001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/179269]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Li, Yuanlong
作者单位	1.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Liu, Lingling,Li, Yuanlong,Wang, Fan. Reduction of Equatorial Obduction by Atmospheric Intraseasonal Oscillations in the Western and Central Pacific Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2022,127(5):19.
APA	Liu, Lingling,Li, Yuanlong,&Wang, Fan.(2022).Reduction of Equatorial Obduction by Atmospheric Intraseasonal Oscillations in the Western and Central Pacific Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,127(5),19.
MLA	Liu, Lingling,et al."Reduction of Equatorial Obduction by Atmospheric Intraseasonal Oscillations in the Western and Central Pacific Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 127.5(2022):19.