Influence of Abyssal Mixing on the Multilayer Circulation in the South China Sea
文献类型：期刊论文
| 作者 | Quan, Qi2; Xue, Huijie3,4; huijiexue@scsio.ac.cn |
| 刊名 | JOURNAL OF PHYSICAL OCEANOGRAPHY
 |
| 出版日期 | 2019 |
| 卷号 | 49期号:12页码:3045 |
| 关键词 | Asia Abyssal circulation Diapycnal mixing Ocean dynamics Ocean models |
| DOI | 10.1175/JPO-D-19-0020.1 |
| 英文摘要 | By parameterizing the abyssal mixing as the exchange velocity (entrainment/detrainment) between the middle and deep layers of the South China Sea (SCS), its effects on the multilayer circulation are examined. Results indicate that the cyclonic circulation in the deep SCS appears only when the mixing induces an entrainment of at least 0.72 Sv (1 Sv equivalent to 10(6) m(3) s(-1)) from the deep to the middle layer, which is equivalent to a diapycnal diffusivity of 0.65 x 10(-3) m(2) s(-1) or a net input rate of gravitational potential energy (GPE) of 6.89 GW, respectively. It is also found that tidal mixing in the SCS is stronger than the threshold for the generation of the cyclonic abyssal circulation, but the pattern and evolution of the deep circulation and meridional overturning circulation also depend on the spatiotemporal variability of the mixing. Moreover, the abyssal mixing is able to intensify the anticyclonic circulation in the middle layer but weaken the cyclonic circulation in the upper layer. Vorticity analysis suggests that the upward net flux induced by the abyssal mixing leads to vortex stretching (squeezing) and modulates the pressure gradient by redistributing the layer thickness, hence affects the pattern and strength of the circulation in the middle (deep) layer of the SCS, respectively. The depth-integrated effect of the thickness variation can modulate the pressure gradient across all layers and hence influence the upper-layer circulation. |
| 资助机构 | Chinese Academy of SciencesChinese Academy of Sciences [XDA10010304, ISEE2018PY05]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41476013] ; Chinese Academy of SciencesChinese Academy of Sciences [XDA10010304, ISEE2018PY05]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41476013] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18186]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 作者单位 | 1.Univ Maine, Sch Marine Sci, Orono, ME 04469 USA 2.Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Peoples R China 3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China 4.Chinese Acad Sci, Inst South China Sea Ecol & Environm Engn, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Quan, Qi,Xue, Huijie,huijiexue@scsio.ac.cn. Influence of Abyssal Mixing on the Multilayer Circulation in the South China Sea[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(12):3045, 3060. |
| APA | Quan, Qi,Xue, Huijie,&huijiexue@scsio.ac.cn.(2019).Influence of Abyssal Mixing on the Multilayer Circulation in the South China Sea.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(12),3045. |
| MLA | Quan, Qi,et al."Influence of Abyssal Mixing on the Multilayer Circulation in the South China Sea".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.12(2019):3045. |
入库方式： OAI收割
来源：南海海洋研究所
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