Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004–20, Revealed from Argo Observations
文献类型：CNKI期刊论文
| 作者 | Guanghui ZHOU; Rong-Hua ZHANG
|
| 发表日期 | 2022-04-04 |
| 出处 | Advances in Atmospheric Sciences
 |
| 关键词 | isopycnal analysis spiciness anomalies subduction pathway advection role decadal variability North Pacific |
| 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°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°–30°N, 120°–150°W) in 2007, which then migrated southwestward along the mean circulation and arrived in the western tropics at(～15°N, 145°E–175°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°C and -0.07 g kg~(-1) temperature and salinity perturbations originated from the eastern subtropics at(120°–150°W, ～30°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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the National Natural Science Foundation of China [NSFC ; Grant Nos. 41690122 (41690120), 42030410] ; the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDB 40000000, XDB 42000000, and XDA19060102) |
| 卷 | v.39期:06页:137-150 |
| 语种 | 英文; |
| 分类号 | P732 |
| ISSN号 | 0256-1530 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187463]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.UniversityofChineseAcademyofSciences 2.CenterforExcellenceinQuaternaryScienceandGlobalChange,ChineseAcademyofSciences 3.CASKeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,andCenterforOceanMega-Science,ChineseAcademyofSciences 4.LaboratoryforOceanandClimateDynamics,PilotNationalLaboratoryforMarineScienceandTechnology |
| 推荐引用方式 GB/T 7714 | Guanghui ZHOU,Rong-Hua ZHANG. Structure and Evolution of Decadal Spiciness Variability in the North Pacific during 2004–20, Revealed from Argo Observations. 2022. |
入库方式： OAI收割
来源：海洋研究所
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