IOCAS-IR  > 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, Guanghui1,2,3; Zhang, Rong-Hua1,2,3,4,5
2022-03-02
Source PublicationADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
Pages14
Corresponding AuthorZhang, Rong-Hua(rzhang@qdio.ac.cn)
AbstractOcean 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.
Keywordisopycnal analysis spiciness anomalies subduction pathway advection role decadal variability North Pacific
DOI10.1007/s00376-021-1358-6
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000763272300002
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/178213
Collection海洋环流与波动重点实验室
Corresponding AuthorZhang, Rong-Hua
Affiliation1.Chinese Acad Sci, CAS Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100029, Peoples R China
4.Pilot Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao 266237, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
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.
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