Meridional and Zonal Eddy-Induced Heat and Salt Transport in the Bay of Bengal and Their Seasonal Modulation
文献类型：期刊论文
| 作者 | Gonaduwage, Lasitha Perera3; Chen, Gengxin; McPhaden, Michael J.; Priyadarshana, Tilak4; Huang, Ke; Wang, Dongxiao; dxwang@scsio.ac.cn |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
 |
| 出版日期 | 2019 |
| 卷号 | 124期号:11页码:8079 |
| 关键词 | eddy diffusivity method eddy-induced transport eddy energetics reduced gravity model baroclinic instability |
| DOI | 10.1029/2019JC015124 |
| 英文摘要 | This study investigates basin and regional-scale eddy (turbulent)-induced heat and salt transport associated with mesoscale eddies of the Bay of Bengal (BOB). A high level of eddy-induced transport is found in four subregions: the western boundary of the northern BOB (NB), the western BOB (WB), the southwestern BOB near Sri Lanka (SWB), and the southeastern BOB (SEB). The main seasons for eddy-induced heat transport in the NB and SWB are identified as the presummer (March to April) and summer monsoon (May to September) seasons, whereas the postsummer monsoon season (October to November) is the main season for the WB and SEB. It is found that not only meridional but also zonal eddy-induced transport is significant, due to the semienclosed nature of the BOB, which restricts poleward transport in the northern part of the bay. An analysis of upper-layer eddy energetics reveals that the main contributor to the increased eddy kinetic energy and thus the transport is baroclinic instability in the NB, SWB, and WB, while both barotropic and baroclinic instability are important in the SEB. Using a 2.5-layer reduced gravity model, baroclinic instability in the NB, SWB, and SEB is further investigated. The results reveal that strong vertical velocity shear and weak stratification are essential for generating baroclinic instability, which enhances the seasonal eddy-induced transport in the respective subregions. Plain Language Summary We estimate eddy-induced heat and salt transport in the Bay of Bengal basin to understand the general characteristics and the key process determining their spatial and seasonal distribution. A linear stability analysis of eddy energetics demonstrates that weak stratification and strong vertical velocity shear generated by the strengthening of mean zonal currents intensify baroclinic instability and enhance the eddy-induced transport. In addition, it is found that the local wind-stress curl and remote forcing from the equator partly contribute to the seasonal modulation of eddy-induced heat transport. Key Points Baroclinic instability controls the seasonal variation of eddy kinetic energy in the western boundary of the Bay of Bengal The strengthening of mean currents intensifies baroclinic instability and enhances seasonal eddy-induced transports Eddies associated with local and remote forcing play an important role in the heat and salt transport in the Bay of Bengal |
| 资助机构 | Youth Innovation Promotion Association CAS [2017397]; Guangzhou Science and Technology Foundation [201804010133]; Opening Project of Key Laboratory of MEIT, SOA [MEIT01, NHXX2018WL0101]; [XDA20060502]; [NSFCs 41521005]; [41822602]; [GML2019ZD0306]; [131551KYSB20160002]; [2017YFB0502700]; [NSFCs 41676010]; [41976016]; [41706027] ; Youth Innovation Promotion Association CAS [2017397]; Guangzhou Science and Technology Foundation [201804010133]; Opening Project of Key Laboratory of MEIT, SOA [MEIT01, NHXX2018WL0101]; [XDA20060502]; [NSFCs 41521005]; [41822602]; [GML2019ZD0306]; [131551KYSB20160002]; [2017YFB0502700]; [NSFCs 41676010]; [41976016]; [41706027] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18198]  |
| 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 Chinese Acad Sci, Beijing, Peoples R China 2.Univ Ruhuna, Fac Fisheries & Marine Sci & Technol, Matara, Sri Lanka 3.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 4.McPhaden, Michael J.] NOAA, Pacific Marine Environm Lab, 7600 Sand Point Way Ne, Seattle, WA 98115 USA |
| 推荐引用方式 GB/T 7714 | Gonaduwage, Lasitha Perera,Chen, Gengxin,McPhaden, Michael J.,et al. Meridional and Zonal Eddy-Induced Heat and Salt Transport in the Bay of Bengal and Their Seasonal Modulation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2019,124(11):8079, 8101. |
| APA | Gonaduwage, Lasitha Perera.,Chen, Gengxin.,McPhaden, Michael J..,Priyadarshana, Tilak.,Huang, Ke.,...&dxwang@scsio.ac.cn.(2019).Meridional and Zonal Eddy-Induced Heat and Salt Transport in the Bay of Bengal and Their Seasonal Modulation.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,124(11),8079. |
| MLA | Gonaduwage, Lasitha Perera,et al."Meridional and Zonal Eddy-Induced Heat and Salt Transport in the Bay of Bengal and Their Seasonal Modulation".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 124.11(2019):8079. |
入库方式： OAI收割
来源：南海海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。