Observed poleward shift of the South Equatorial Current and associated thermohaline variations in the South Pacific subtropical gyre
文献类型：期刊论文
| 作者 | Sun, Jingxuan2,3 ; Zhang, Linlin1,2,3
|
| 刊名 | GEOSCIENCE LETTERS
 |
| 出版日期 | 2025-05-06 |
| 卷号 | 12期号:1页码:11 |
| 关键词 | Pacific South Equatorial Current Steric height Long-term change Poleward shift |
| ISSN号 | 2196-4092 |
| DOI | 10.1186/s40562-025-00393-7 |
| 通讯作者 | Zhang, Linlin(zhanglinlin@qdio.ac.cn) |
| 英文摘要 | The meridional shift of the Pacific South Equatorial Current (SEC) and the thermohaline variability in the South Pacific subtropical gyre during 1960-2020 are investigated using observational datasets. As the northern limb of the gyre circulation, the southern branch of the SEC has shifted poleward at a rate of approximately 0.17 degrees/decade between 170 degrees E and 140 degrees W, but has no intensification in the zonal volume transport. This shift is reflected in the poleward shift of the basin-scale easterly winds, and consequently a southward migration of the SEC through the baroclinic Rossby wave adjustments. Such poleward shift in easterlies is proposed tightly relevant to the intensification of the Southern Annular Mode. A 1.5-layer reduced gravity model is then adopted to provide a dynamic framework that helps our understanding of these observed changes. Meanwhile, the steric height in the South Pacific subtropical gyre region exhibits a linearly upward trend, and contributions from haline contraction is comparable to thermal expansion between 20 degrees and 40 degrees S at 500-1000 m, underscoring a significant role of salinity modifications in the subsurface ocean. Further analysis indicates that the halosteric component change is related to the widespread freshening in the Southern Hemisphere over the past decades. |
| WOS关键词 | LOW-FREQUENCY VARIABILITY ; SEA-LEVEL VARIABILITY ; OVERTURNING CIRCULATION ; OCEAN CIRCULATION ; ROSSBY-WAVE ; WATER ; TRANSPORT ; TRENDS ; DRIVEN ; RISE |
| 资助项目 | National Natural Science Foundation of China ; Chinese Academy of Sciences |
| WOS研究方向 | Geology ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:001482791600001 |
| 出版者 | SPRINGER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/201775]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 通讯作者 | Zhang, Linlin |
| 作者单位 | 1.Laoshan Lab, Qingdao, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Jingxuan,Zhang, Linlin. Observed poleward shift of the South Equatorial Current and associated thermohaline variations in the South Pacific subtropical gyre[J]. GEOSCIENCE LETTERS,2025,12(1):11. |
| APA | Sun, Jingxuan,&Zhang, Linlin.(2025).Observed poleward shift of the South Equatorial Current and associated thermohaline variations in the South Pacific subtropical gyre.GEOSCIENCE LETTERS,12(1),11. |
| MLA | Sun, Jingxuan,et al."Observed poleward shift of the South Equatorial Current and associated thermohaline variations in the South Pacific subtropical gyre".GEOSCIENCE LETTERS 12.1(2025):11. |
入库方式： OAI收割
来源：海洋研究所
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